The question is : Elements X and Z form two different binary compounds. The first contains 0.2247 g X/1.000 g Z, and the second contains 0.1348 g X/1.000 g Z. If the formula for the first compound is a multiple of X2Z3, the formula of the second compound is a multiple of

A) XZ2 B) XZ3 C) X2Z5 D) X2Z7 E) none of these

The answer is C but I dont know how to get there

Please help soon!

Thank you