How many grams of H_2O are present in 0.2 moles of H_2O, given that the molar mass of H_2O is 18.01 g/mol?

• A. 36.02 g
• B. 0.90 g
• C. 3.60 g
• D. 9.00 g

Answer: (C)

Verified step by step guidance

1. Identify the given information: the amount of substance (moles) of H_2O is 0.2 moles, and the molar mass of H_2O is 18.01 g/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: \(\\text{mass} = 0.2 \\text{ moles} \\times 18.01 \\text{ g/mol}\).
4. Perform the multiplication to find the mass of H_2O in grams (do not calculate the final number here, just set up the expression).
5. Interpret the result as the mass of water corresponding to 0.2 moles, which answers the question.