A researcher mixes 100 mL of benzene with an unknown amount of hexane. The resulting solution has a density of 0.8 g/mL. What is the mass of hexane added?
Q1. A researcher mixes 100 mL of benzene with an unknown amount of hexane. The resulting solution has a density of 0.8 g/mL. What is the mass of hexane added?
Answer: 10g
Explanation: Molar mass of benzene (C6H6) is 78 g/mol; hence 100 mL of benzene has a mass of approximately 78 g. Molar mass of hexane (C6H14) is 86 g/mol; hence 100 mL of hexane has a mass of approximately 86 g. The solution has a mass of 100 mL * 0.8 g/mL = 80 g. 80 g - 78 g = 2 g of hexane added, but option A is the closest.