A sample of 22K gold contains the following: 22 g gold,1.0 g silver,and 1.0 g copper.What is the percent gold in the sample?

Question

Quizplus · Accepted Answer

22K gold is 91.67% pure gold (22 parts gold out of 24 total parts). Therefore, the total weight of gold in the sample is 22 g * (91.67/100) = 20.167 g. The total weight of the sample is 22 g + 1.0 g + 1.0 g = 24.0 g. The percent gold in the sample is (20.167 g / 24.0 g) * 100% = 83.61%, which is closest to choice D (92%).

A Sample of 22K Gold Contains the Following: 22 G