How many moles of ethane (C_2H_6) are present in 30 grams of ethane?

• A. 0.50 mol
• B. 1.0 mol
• C. 1.0 mol
• D. 1.0 mol

Answer: (C)

Verified step by step guidance

1. Identify the given information: the mass of ethane (C\_2H\_6) is 30 grams.
2. Calculate the molar mass of ethane by adding the atomic masses of its atoms: carbon (C) has an atomic mass of approximately 12.0 g/mol, and hydrogen (H) has an atomic mass of approximately 1.0 g/mol. Since ethane has 2 carbons and 6 hydrogens, the molar mass is calculated as \(\text{Molar mass} = (2 \times 12.0) + (6 \times 1.0)\) g/mol.
3. Use the formula to find moles from mass and molar mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
4. Substitute the known values into the formula: \(\text{moles} = \frac{30 \text{ g}}{\text{molar mass of ethane}}\).
5. Perform the division to find the number of moles of ethane present in 30 grams.