Chemical Compound Algebra 2

Question

A beaker of pH3 contains 372 grams of hydrogen. What is the total weight? (P,31,H,1)

Answer 1

In a molecule of PH₃, every 1 atom of P has 3 atoms of H. If there is 372 grams of H, and since H=1, then there is 372/3 or 124 atoms P. But P = 31, so 124(31) = 3844 grams of P.

Total weight = mass H + mass P = 372 + 3844 = 4216 grams PH₃.