Question Detail
Question
Five 1 peseta coins from Spain were dropped into a graduated cylinder containing 20.20 mL of water. The volume of the water increased to 22.05 mL. A single coin had a mass of 0.99 gram. What is the identity of the metal used for the Spanish peseta coins (density of Al = 2.7 g/mL, density of Zn = 7.1 g/mL, density of Cu = 9.0 g/mL, density of Ag = 7.1 g/mL)?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Volume of 5 coins = 22.05 - 20.20 = 1.85 mL. Volume of 1 coin = 1.85/5 = 0.37 mL. Density = mass/volume = 0.99/0.37 = 2.68 g/mL. None match exactly, but closest to Al (2.7). The problem likely has a misprint; based on given densities, Zn and Ag are 7.1, Cu 9.0. 2.68 is closest to Al.
Hint
Density = mass/volume. Calculate and compare.