Question

The atomic mass of iron is 55.85, and oxygen is 16.0. What is the mass of 6.02 × 1023 molecules of Fe2O3?
A. 71.85 g

B. 143.7 g

C. 159.7 g

D. 199.55 g

E. 215.55 g

Answer 1

6.02x10^23=1 mol
molecular mass of Fe2O3: 55.85x2+16.0x3 = 159.7
Mass of 1 mol of Fe2O3=159.7x1=159.7 (g)