What is the mass (in grams) of 1.27 mol of water (H_2O)?

• A. 18.0 g
• B. 22.9 g
• C. 25.0 g
• D. 15.2 g

Answer: (C)

Verified step by step guidance

1. Identify the given quantity: 1.27 moles of water (H\_2O).
2. Recall the molar mass of water, which is the sum of the atomic masses of 2 hydrogen atoms and 1 oxygen atom. Use the atomic masses: H = 1.0 g/mol, O = 16.0 g/mol.
3. Calculate the molar mass of water using the formula: \(\text{Molar mass of H\_2O} = 2 \times 1.0 + 16.0\) g/mol.
4. Use the relationship between moles, molar mass, and mass: \(\text{mass} = \text{moles} \times \text{molar mass}\).
5. Multiply the given moles (1.27 mol) by the molar mass of water to find the mass in grams.