Question

Calculate the mass percent composition of carbon
in
C3H4

Answer 1

Answer: 90%

Explanation:

So we need to find the molar mass of the entire compound, and the mass of carbon times the number of molecules:

Molar mass: 3*12 + 4*1 = 40

Mass of carbon: 12*3 = 36

36/40 * 100 = 9/10 * 100 = 90%