How many moles of K_2SO_4 are present in 15.0 g of K_2SO_4? (Molar mass of K_2SO_4 = 174 g/mol)

• A. 0.0862 mol
• B. 0.115 mol
• C. 0.172 mol
• D. 0.0150 mol

Answer: (A)

Verified step by step guidance

1. Identify the given information: mass of K_2SO_4 is 15.0 g and the molar mass of K_2SO_4 is 174 g/mol.
2. Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
3. Substitute the given values into the formula: \(\text{moles} = \frac{15.0\ \text{g}}{174\ \text{g/mol}}\).
4. Perform the division to find the number of moles (do not calculate the final value here, just set up the expression).
5. Interpret the result as the amount of substance in moles of K_2SO_4 present in the 15.0 g sample.