Question

A sample of CaCO3 (molar mass 100. g) was reported as being 30. percent Ca. Assuming no calcium was present in any impurities, the percent of CaCO3 in the sample is:_________.
A. 30%
B. 40%
C. 70%
D. 75%
E. 100%

Answer 1

Answer:

D.75%

Explanation:

CaCO3 is 40% calcium. therefore if the sample is only 30%calcium, it must only be 3/4 calcium carbonate