Given that the molar mass of H_2O is 18.02 g/mol, how many grams of H_2O are present in 0.20 mol?

• A. 3.60 g
• B. 9.01 g
• C. 0.90 g
• D. 36.04 g

Answer: (A)

Verified step by step guidance

1. Identify the given information: the molar mass of H\_2O is 18.02 g/mol, and the amount of substance is 0.20 mol.
2. Recall the relationship between mass, moles, and molar mass, which is given by the formula: \(\\text{mass} = \\text{moles} \\times \\text{molar mass}\).
3. Substitute the known values into the formula: \(\\text{mass} = 0.20 \\text{ mol} \\times 18.02 \\text{ g/mol}\).
4. Perform the multiplication to find the mass in grams (do not calculate the final number here, just set up the expression).
5. Interpret the result as the mass of H\_2O corresponding to 0.20 mol, which can then be compared to the given answer choices.