Moles in 36 grams of water: every AI model's reply, tested

Help me understand and answer this homework question. Explain the idea step by step, then give the answer. Explain it for a high-school student.

---
How many moles of water are in 36 grams of water?

How the AI homework helper's test inputs are scored, with every model's results on all five.

1. GPT-6 Luna

   Passed: Final answer 2 moles of water.: right.

   This question asks you to convert a mass of water into the amount of substance, measured in moles. To do that, divide the mass by water’s molar mass.
   
   1. Water’s formula is H₂O. Its molar mass is about 18 grams per mole: 2 × 1 for hydrogen plus 16 for oxygen.
   2. Divide the given mass by the molar mass: 36 grams ÷ 18 grams per mole = 2 moles.
   
   Final answer: 2 moles of water.

   326 tokens in, 159 out (45 of them reasoning) · 3.9 s · $0.0001 · 1 message on Pro · answered by openai/gpt-6-luna via OpenAI · September 28, 2026

2. GLM 5.3 Flash

   Passed: Final answer 2 moles of water.: right.

   This question is asking you to convert a mass of water (grams) into an amount of substance (moles), using the mole concept from chemistry.
   
   The key idea: a mole is just a counting unit for tiny particles, and the molar mass of a substance tells you how many grams one mole of that substance weighs. For water (H2O), you find the molar mass by adding up the atomic masses from the periodic table:
   
   1. Hydrogen (H) has an atomic mass of about 1 g/mol, and there are 2 hydrogens: 2 x 1 = 2 g/mol.
   2. Oxygen (O) has an atomic mass of about 16 g/mol, and there is 1 oxygen: 16 g/mol.
   3. Add them: 2 + 16 = 18 g/mol. So one mole of water weighs 18 grams.
   
   Now convert grams to moles with the formula:
   
   moles = mass / molar mass
   
   4. Plug in the numbers: 36 g / 18 g/mol = 2 mol.
   
   Quick check: 36 is exactly two 18s, so two moles makes sense. (Fun side note: that's about 2 x 6.02 x 10^23 = 1.2 x 10^24 water molecules, but the question only asks for moles.)
   
   Final answer: 2 moles of water.

   333 tokens in, 293 out · 3.9 s · $0.0002 · 1 message on Pro · answered by z-ai/glm-5.3-flash via Friendli · September 28, 2026

3. Claude Haiku 5.5

   Passed: Final answer 36 grams of water is about 2.0 moles of water (2.00 mol).: right.

   The question is asking you to convert a mass (36 grams) into an amount in moles, using the molar mass of water.
   
   Step 1: Understand what a mole is. A mole is just a counting unit, like a "dozen" means 12. One mole is 6.022 × 10^23 particles (Avogadro's number). Chemists use it because atoms and molecules are far too tiny to count one by one, so we weigh them instead.
   
   Step 2: Find the mass of one mole of water. Water is H2O: two hydrogen atoms and one oxygen atom. From the periodic table, hydrogen is about 1.008 g/mol and oxygen is about 16.00 g/mol.
   2 × 1.008 = 2.016
   2.016 + 16.00 = 18.02 g/mol
   So one mole of water weighs about 18.02 grams.
   
   Step 3: Use the formula that links mass and moles:
   moles = mass ÷ molar mass
   
   Think of it like this: if one dozen eggs weighs a known amount, you can work out how many dozens are in a given weight by dividing. Same idea here.
   
   Step 4: Plug in the numbers.
   moles = 36 g ÷ 18.02 g/mol ≈ 2.00 mol
   
   Quick check: 36 grams is about double 18 grams, so the answer should be close to 2. It is.
   
   Final answer: 36 grams of water is about 2.0 moles of water (2.00 mol).

   427 tokens in, 468 out · 2.7 s · $0.0003 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic · October 7, 2026

4. DeepSeek V4.1 Flash

   Passed: Final answer 2 moles of water: right.

   The question is asking you to convert a mass of water (36 grams) into an amount in moles, using water's molar mass.
   
   A mole is just a counting unit, like a dozen, but much larger. The molar mass tells you how many grams one mole of a substance weighs. For water, H2O, you find it from the periodic table:
   
   1. Hydrogen has an atomic mass of about 1 gram per mole. There are 2 hydrogens in water, so that part is about 2 g/mol.
   2. Oxygen has an atomic mass of about 16 g/mol.
   3. Add them: 2 + 16 = 18 g/mol. So one mole of water weighs about 18 grams.
   
   Now use the conversion:
   
   moles = mass / molar mass
   moles = 36 g / 18 g/mol
   moles = 2 mol
   
   So 36 grams of water contains 2 moles of water molecules. Using more precise atomic masses gives about 1.998, which rounds to 2.0.
   
   Final answer: 2 moles of water

   352 tokens in, 331 out (107 of them reasoning) · 1.2 s · $0.0004 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Together · October 8, 2026

5. Gemini 3.8 Flash

   Passed: Final answer 2 moles: right.

   This question is asking you to convert a given mass of water into a chemistry counting unit called "moles." In short, it wants to know how many groups of water molecules are in that 36-gram sample.
   
   Think of a mole just like the word "dozen." A dozen eggs is 12 eggs, but a dozen eggs has a specific weight. In chemistry, atoms are so tiny that we group them into huge bunches called moles. One mole of any substance is equal to its formula mass written in grams (known as molar mass). 
   
   Here is how to solve the problem step by step:
   
   Step 1: Find the chemical formula for water.
   Water is H2O, which means each water molecule is made of 2 hydrogen atoms and 1 oxygen atom.
   
   Step 2: Calculate the molar mass of water.
   Look at the periodic table for the atomic mass of each element. Hydrogen has an atomic mass of about 1 gram per mole. Oxygen has an atomic mass of about 16 grams per mole. 
   To find the mass of one whole mole of water, add them together: (2 hydrogen atoms * 1 gram) + (1 oxygen atom * 16 grams) = 2 + 16 = 18 grams per mole.
   This means that 1 mole of water weighs exactly 18 grams.
   
   Step 3: Divide the mass you have by the molar mass.
   You are given 36 grams of water. To find out how many 18-gram portions (moles) that is, use the formula: Moles = Mass / Molar Mass.
   Moles = 36 grams / 18 grams per mole = 2 moles.
   
   Final answer: 2 moles

   336 tokens in, 366 out · 2.4 s · $0.0008 · 1 message on Pro · answered by google/gemini-3.8-flash via Google AI Studio · September 28, 2026

6. GPT-6.1 Sol

   Passed: Final answer 2 moles of water.: right.

   The question is asking you to convert a mass of water in grams into an amount in moles. A mole is a counting unit that represents about 6.02 × 10²³ molecules.
   
   1. Find the molar mass of water.
   Water is H₂O, so each molecule contains two hydrogen atoms and one oxygen atom. Using their rounded atomic masses:
   Molar mass = (2 × 1) + 16 = 18 grams per mole.
   
   2. Divide the mass by the molar mass.
   Moles = mass ÷ molar mass
   Moles of water = 36 grams ÷ 18 grams per mole = 2 moles.
   
   Think of it this way: each 18-gram portion of water contains one mole, so 36 grams contains two such portions.
   
   Final answer: 2 moles of water.

   326 tokens in, 177 out · 4.2 s · $0.0012 · 1 message on Pro · answered by openai/gpt-6.1-sol via OpenAI · September 29, 2026

7. GPT-6 Sol

   Passed: Final answer 2 moles of water.: right.

   This question asks you to convert the mass of water, measured in grams, into an amount measured in moles. To do that, you need the molar mass of water: the mass of one mole.
   
   1. Water is H2O: it has two hydrogen atoms and one oxygen atom. Hydrogen has a molar mass of about 1 g/mol, and oxygen about 16 g/mol, so water’s molar mass is (2 × 1) + 16 = 18 g/mol.
   
   2. Divide the mass you have by the molar mass: 36 g ÷ 18 g/mol = 2 mol.
   
   Final answer: 2 moles of water.

   326 tokens in, 183 out (37 of them reasoning) · 2.7 s · $0.0012 · 1 message on Pro · answered by openai/gpt-6-sol via OpenAI · September 28, 2026

8. GLM 5.3

   Passed: Final answer 2 moles of water.: right.

   This question is asking you to convert a mass of water (given in grams) into an amount in moles, which is the unit chemists use to count particles.
   
   The key idea: a mole is just a counting unit, like a "dozen" means 12 things. One mole of any substance has a mass equal to its molar mass in grams. Water is H₂O, so its molar mass is:
   
   Step 1: Find the molar mass of water.
   - Hydrogen: about 1 g/mol, and there are 2 of them → 2 × 1 = 2
   - Oxygen: about 16 g/mol, and there is 1 → 16
   - Total: 2 + 16 = 18 g/mol
   
   So one mole of water weighs 18 grams.
   
   Step 2: Set up the conversion.
   You have 36 grams, and each mole weighs 18 grams. To find how many "18-gram chunks" fit into 36 grams, divide:
   
   36 ÷ 18 = 2
   
   Step 3: Check the units.
   36 g ÷ 18 g/mol = 2 mol. The grams cancel out, leaving moles, so the units work.
   
   A quick example to build intuition: if a dozen eggs weighed 18 ounces and you had 36 ounces of eggs, you'd have 2 dozen. Same logic here, just with moles.
   
   Final answer: 2 moles of water.

   333 tokens in, 305 out · 1.5 s · $0.0014 · 1 message on Pro · answered by z-ai/glm-5.3 via Friendli · September 28, 2026

9. DeepSeek V4 Pro

   Passed: Final answer 2 moles of water: right.

   The question is asking you to convert a mass of water into an amount measured in moles. A mole is just a counting unit for particles, like a dozen means 12, except a mole means about 6.02 times 10 to the 23 particles.
   
   Here is how to solve it step by step.
   
   Step 1: Write the formula for water.
   Water is H2O, so each water molecule has 2 hydrogen atoms and 1 oxygen atom.
   
   Step 2: Find the molar mass of water.
   From the periodic table, hydrogen has an atomic mass of about 1 gram per mole, and oxygen has an atomic mass of about 16 grams per mole.
   
   So for H2O:
   2 hydrogens: 2 times 1 = 2 grams per mole
   1 oxygen: 1 times 16 = 16 grams per mole
   Total molar mass = 2 + 16 = 18 grams per mole
   
   This means one mole of water has a mass of 18 grams.
   
   Step 3: Use the formula connecting mass and moles.
   The formula is:
   
   moles = mass divided by molar mass
   
   Step 4: Plug in the numbers.
   mass = 36 grams
   molar mass = 18 grams per mole
   
   moles of water = 36 divided by 18 = 2
   
   So 36 grams of water is 2 moles of water.
   
   Final answer: 2 moles of water

   326 tokens in, 464 out (173 of them reasoning) · 4.4 s · $0.0019 · 1 message on Pro · answered by deepseek/deepseek-v4-pro-0813 via Wafer · October 8, 2026

10. Claude Haiku 4.5

    Passed: Final answer 2 moles: right.

    What the question is asking:
    
    You need to convert a mass measurement (grams) into a count of particles (moles). A mole is a standard unit that chemists use to talk about how many molecules or atoms are in a sample.
    
    Here's how to solve it step by step:
    
    Step 1: Find the molar mass of water.
    
    Water is H2O. That means each molecule has 2 hydrogen atoms and 1 oxygen atom. Look up the atomic masses: hydrogen is about 1 g/mol and oxygen is about 16 g/mol. So one molecule of water has a mass of (2 × 1) + 16 = 18 g/mol. This is the molar mass.
    
    Step 2: Understand what molar mass means.
    
    Molar mass tells you how many grams are in exactly one mole of that substance. So 18 grams of water = 1 mole of water.
    
    Step 3: Use the molar mass as a conversion factor.
    
    You have 36 grams and you want to know how many moles. You can set this up as:
    
    36 grams × (1 mole / 18 grams) = 36/18 = 2 moles
    
    The grams cancel out, leaving you with moles.
    
    Step 4: Do the math.
    
    36 divided by 18 equals 2.
    
    Final answer: 2 moles

    346 tokens in, 327 out · 3.4 s · $0.0020 · 1 message on Pro · answered by anthropic/claude-haiku-4.5 via Anthropic · September 28, 2026

11. Mistral Large 4

    Passed: Final answer 2 moles: right.

    This question is asking you to convert 36 grams of water into moles, which is the unit chemists use to count molecules.
    
    Here is how to solve it step by step.
    
    1. Remember what a mole is. A mole is just a counting number, like a dozen. Instead of 12, one mole equals about 6.022 times 10 to the 23rd power particles. For water, one mole means that many H2O molecules.
    
    2. Find the molar mass of water. The molar mass is the weight of one mole of a substance, measured in grams per mole. Water is H2O, so it has two hydrogen atoms and one oxygen atom. On the periodic table, hydrogen has an atomic mass of about 1 gram per mole, and oxygen is about 16 grams per mole. Add them up: 2 times 1 plus 16 equals 18 grams per mole. This means one mole of water weighs 18 grams.
    
    3. Use the conversion formula. To turn grams into moles, divide the mass you have by the mass of one mole. The formula is: moles equals grams divided by grams per mole.
    
    4. Plug in the numbers. Take 36 grams and divide by 18 grams per mole. The grams cancel out, and you get 2.
    
    So 36 grams of water is 2 moles of water.
    
    Final answer: 2 moles

    330 tokens in, 1,688 out (1,349 of them reasoning) · 16.6 s · $0.0038 · 1 message on Pro · answered by mistralai/mistral-large-4-0 via Mistral · October 9, 2026

12. Kimi K3

    Passed: Final answer 2 moles of water.: right.

    What this question is really asking: how to convert a mass of a substance (36 grams of water) into a number of moles, which is just chemists' way of counting particles.
    
    The key idea is the mole. A mole is a counting unit, like a "dozen," but much bigger: one mole is about 6.02 x 10^23 particles. Every substance has a molar mass, which tells you how many grams one mole of that substance weighs. For water (H2O), the molar mass is about 18 grams per mole. That comes from the periodic table: each hydrogen atom weighs about 1 gram per mole and oxygen about 16, so 1 + 1 + 16 = 18 g/mol.
    
    Here's how to solve it, step by step:
    
    1. Find the molar mass of water. Hydrogen is about 1 g/mol and oxygen is about 16 g/mol, so H2O is 2(1) + 16 = 18 g/mol.
    
    2. Use the conversion formula: moles = mass divided by molar mass.
    
    3. Plug in the numbers: moles = 36 g / 18 g/mol = 2 mol.
    
    Think of it like this: if each "box" of water molecules weighs 18 grams, and you have 36 grams total, you have 36 / 18 = 2 boxes, or 2 moles.
    
    You can check your answer by making sure the units work out: grams divided by grams-per-mole leaves you with moles, which is what the question asked for.
    
    Final answer: 2 moles of water.

    413 tokens in, 400 out (44 of them reasoning) · 38.1 s · $0.0040 · 1 message on Pro · answered by moonshotai/kimi-k3 via Wafer · September 28, 2026

13. Grok 4.7

    Passed: Final answer 2 moles: right.

    The question asks you to turn a given mass of water into moles, which means finding how many “packages” of water molecules that mass contains.
    
    A mole is a counting unit in chemistry, like a dozen is a counting unit for eggs. One mole of any substance has the same number of particles (Avogadro’s number), and its mass in grams is the molar mass. For water, H2O, each molecule has two hydrogen atoms and one oxygen atom. Hydrogen is about 1 gram per mole and oxygen is about 16 grams per mole, so the molar mass of water is 2 + 16 = 18 grams per mole. That means 18 grams of water is exactly 1 mole.
    
    To find moles from mass, divide the mass you have by the molar mass:
    
    1. Write the formula: moles = mass (g) ÷ molar mass (g/mol).
    2. Put in the numbers for this problem: moles = 36 g ÷ 18 g/mol.
    3. Divide: 36 ÷ 18 = 2.
    
    So 36 grams of water is twice the mass of one mole, which means it is 2 moles of water. You can check the idea with a smaller case: 18 grams would be 1 mole, and 9 grams would be 0.5 mole.
    
    Final answer: 2 moles

    1,561 tokens in, 600 out (323 of them reasoning) · 7.9 s · $0.0050 · 1 message on Pro · answered by x-ai/grok-4.7 via xAI · October 2, 2026

14. Claude Sonnet 5

    Passed: Final answer 2 moles: right.

    What the question is really asking: you're given a mass of water (36 grams) and need to convert it into moles, which is the chemistry unit for counting particles (atoms, molecules).
    
    Step by step explanation:
    
    1. Moles are a way chemists count huge numbers of tiny particles, similar to how "a dozen" means 12 of something. One mole of any substance always contains the same number of particles (Avogadro's number), but the mass of one mole differs depending on what substance it is.
    
    2. To convert grams to moles, you use this idea: moles = mass (in grams) divided by molar mass (grams per mole).
    
    3. Molar mass is the mass of one mole of a substance, and you find it by adding up the atomic masses of all the atoms in the molecule, using the periodic table.
    
    4. For water, H2O, you need:
       - Hydrogen (H): atomic mass about 1 gram/mole, and there are 2 hydrogens, so 2 x 1 = 2
       - Oxygen (O): atomic mass about 16 grams/mole, and there is 1 oxygen, so 1 x 16 = 16
    
    5. Add these together to get the molar mass of water: 2 + 16 = 18 grams/mole.
    
    6. Now use the formula: moles = mass / molar mass = 36 grams / 18 grams per mole.
    
    7. Do the division: 36 divided by 18 equals 2.
    
    Example to build intuition: think of molar mass like the weight of one "box" of water molecules (a mole is just a very large box). If one box weighs 18 grams, and you have 36 grams total, you must have 2 boxes, because 36 divided by 18 is 2.
    
    Final answer: 2 moles

    425 tokens in, 548 out · 7.9 s · $0.0063 · 1 message on Pro · answered by anthropic/claude-sonnet-5 via Anthropic · September 28, 2026

15. Claude Sonnet 5.5

    Passed: Final answer 2 moles of water: right.

    This question is asking you to convert a mass of water (36 grams) into an amount measured in moles. A mole is just a counting unit for very tiny particles, like "a dozen" but much bigger.
    
    The idea behind it:
    
    A mole is a fixed number of particles (about 6.02 x 10^23). Chemists use it because atoms and molecules are far too small to count one by one. Every substance has a molar mass, which tells you how many grams one mole of it weighs. So if you know the mass and the molar mass, you can find the number of moles:
    
    moles = mass in grams ÷ molar mass (g/mol)
    
    Steps:
    
    1. Write the formula for water: H2O. Each molecule has 2 hydrogen atoms and 1 oxygen atom.
    
    2. Find the molar mass using the periodic table. Hydrogen is about 1.008 g/mol (use 1 for simplicity) and oxygen is about 16.00 g/mol.
    
    3. Add them up: 2 x 1 + 16 = 18 g/mol. This means 1 mole of water weighs 18 grams.
    
    4. Divide the mass you have by the molar mass: 36 g ÷ 18 g/mol = 2 mol.
    
    A quick sense check: 36 grams is exactly two lots of 18 grams, so it makes sense that you have 2 moles. Notice the grams cancel in the division, leaving just moles, which is a good sign you set it up correctly.
    
    If your teacher wants more precision, using 1.008 for hydrogen gives a molar mass of 18.016 g/mol, and 36 ÷ 18.016 is about 2.0 mol. Same answer to two significant figures.
    
    Final answer: 2 moles of water

    427 tokens in, 556 out · 4.6 s · $0.0064 · 1 message on Pro · answered by anthropic/claude-sonnet-5.5 via Anthropic · September 28, 2026

16. GPT-6 Astra

    Passed: Final answer 2 moles of water.: right.

    The question is asking you to convert a mass of water in grams into an amount in moles. A mole is a counting unit for particles, just as a dozen means 12 items.
    
    1. Find the molar mass of water.
    
    Water is H2O, so each molecule contains 2 hydrogen atoms and 1 oxygen atom. Using the rounded atomic masses of hydrogen (1) and oxygen (16):
    
    Molar mass of water = (2 × 1) + 16 = 18 grams per mole.
    
    This means 1 mole of water has a mass of 18 grams.
    
    2. Divide the given mass by the molar mass.
    
    Moles = mass ÷ molar mass
    Moles of water = 36 grams ÷ 18 grams per mole = 2 moles.
    
    3. Check that the answer makes sense.
    
    36 grams is twice 18 grams, so it contains twice as many moles: 2 instead of 1.
    
    Final answer: 2 moles of water.

    326 tokens in, 210 out · 3.6 s · $0.0069 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI · September 28, 2026

17. Gemini 3.1 Pro

    Passed: Final answer 2: right.

    This question is asking you to convert the physical weight of water into a chemical counting unit called a mole. To do this, you just need to figure out how much one single mole of water weighs, and then see how many of those fit into your 36 grams.
    
    Think of a mole like a chemist's version of a dozen. Just like a dozen always means 12 things, a mole always means a specific, very large number of atoms or molecules. Because molecules are so tiny, we use the weight of a mole, called molar mass, to count them. For example, if you know a dozen apples weighs 2 pounds, and you have 4 pounds of apples, you divide 4 by 2 to find out you have 2 dozen. We will do the exact same thing with water.
    
    1. Find the chemical formula for water. Water is H2O, which means every molecule has two hydrogen atoms and one oxygen atom.
    
    2. Look up the atomic weights on the periodic table. Hydrogen has an atomic weight of about 1 gram per mole. Oxygen has an atomic weight of about 16 grams per mole.
    
    3. Calculate the weight of one mole of water. Since there are two hydrogens and one oxygen, you add 1 plus 1 plus 16. This gives you exactly 18. So, one mole of water weighs 18 grams.
    
    4. Divide your total weight by the weight of one mole. The problem states you have 36 grams of water. Divide 36 by 18. The result is 2. 
    
    This means your 36 grams of water is exactly equal to 2 moles.
    
    Final answer: 2

    336 tokens in, 1,290 out (935 of them reasoning) · 11.8 s · $0.0081 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google AI Studio · September 28, 2026

18. Claude Opus 5.5

    Passed: Final answer 2 moles of water: right.

    This question asks you to convert a mass of water (36 grams) into a number of moles. To do that, you need to know how much one mole of water weighs, which is called its molar mass.
    
    The idea behind it
    
    A mole is a counting unit, like a dozen, but much bigger: one mole is about 6.02 × 10^23 particles. Different substances have different masses per mole because their molecules weigh different amounts. The molar mass tells you how many grams one mole of a substance weighs. Once you know it, converting grams to moles is just division:
    
    moles = mass in grams ÷ molar mass (grams per mole)
    
    Step by step
    
    1. Write the chemical formula. Water is H2O, so each molecule has 2 hydrogen atoms and 1 oxygen atom.
    
    2. Look up the atomic masses on the periodic table.
    Hydrogen (H) is about 1 g/mol.
    Oxygen (O) is about 16 g/mol.
    
    3. Add them up to get the molar mass of water.
    2 hydrogens: 2 × 1 = 2
    1 oxygen: 1 × 16 = 16
    Total: 2 + 16 = 18 g/mol
    So one mole of water weighs 18 grams.
    
    4. Divide the given mass by the molar mass.
    moles = 36 g ÷ 18 g/mol = 2 mol
    
    Notice how the units work out. Grams divided by grams per mole leaves just moles. Checking units like this is a good way to make sure you set up the problem correctly.
    
    A quick sanity check
    
    If 18 grams is one mole, then 36 grams is twice as much, so it should be 2 moles. That matches.
    
    A note on precision
    
    If your class uses more precise atomic masses (H = 1.008, O = 16.00), the molar mass comes out to 18.02 g/mol, and 36 ÷ 18.02 ≈ 2.00 mol. The answer is still 2 moles.
    
    Final answer: 2 moles of water

    427 tokens in, 702 out (67 of them reasoning) · 6.9 s · $0.0157 · 1 message on Pro · answered by anthropic/claude-opus-5.5 via Google · September 28, 2026

19. Claude Fable 5.1

    Passed: Final answer 2 moles of water: right.

    This question is asking you to convert a mass of water (36 grams) into a number of moles, which means figuring out how many "chemist's dozens" of water molecules that mass contains.
    
    The idea behind it
    
    A mole is just a counting unit, like a dozen, except it's a huge number (about 6.02 × 10^23 particles). The useful thing about moles is that the molar mass of a substance (grams per mole) is equal to its formula mass in atomic mass units. So if you know the formula, you can read the molar mass right off the periodic table, and then convert grams to moles by dividing.
    
    Step by step
    
    1. Write the formula for water: H2O. That's 2 hydrogen atoms and 1 oxygen atom per molecule.
    
    2. Find the molar mass by adding up the atomic masses from the periodic table:
       Hydrogen is about 1.0 g/mol, and there are 2 of them: 2 × 1.0 = 2.0 g/mol
       Oxygen is about 16.0 g/mol, and there is 1: 1 × 16.0 = 16.0 g/mol
       Total: 2.0 + 16.0 = 18.0 g/mol
    
       So one mole of water weighs 18 grams.
    
    3. Use the conversion formula:
       moles = mass ÷ molar mass
    
    4. Plug in the numbers:
       moles = 36 g ÷ 18 g/mol = 2 mol
    
    Quick way to check it makes sense: if 18 grams is one mole, then 36 grams is twice that, so it should be two moles. It is.
    
    A similar example: if you had 44 grams of carbon dioxide (CO2), the molar mass is 12 + 2 × 16 = 44 g/mol, so 44 g ÷ 44 g/mol = 1 mole. Same method, different substance.
    
    Final answer: 2 moles of water

    427 tokens in, 604 out · 8.9 s · $0.0345 · 1 message on Pro · answered by anthropic/claude-fable-5.1 via Google · September 28, 2026

• Why ice floats
• Weather versus climate
• The causes of World War I
• Distance under constant acceleration
• AI homework helper: try it free, and every model's results