How many moles are present in 35 g of H_2O?

• A. 0.35 moles
• B. 1.94 moles
• C. 0.65 moles
• D. 3.5 moles

Answer: (B)

Verified step by step guidance

1. Identify the given information: the mass of water (H_2O) is 35 grams.
2. Determine the molar mass of water by adding the atomic masses of its elements: hydrogen (H) has an atomic mass of approximately 1 g/mol, and oxygen (O) has an atomic mass of approximately 16 g/mol. Since water has 2 hydrogens and 1 oxygen, calculate the molar mass as \$2 \times 1 + 16$ g/mol.
3. Use the formula to find moles: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
4. Substitute the known values into the formula: \(\text{moles} = \frac{35}{\text{molar mass of H_2O}}\).
5. Perform the division to find the number of moles present in 35 g of water.