Question

6.02*10^20 molecules of substance weigh 44 mg. What is molecular mass of substance

Answer 1

2×10²⁰ molecules weigh 44mg
since molecular mass of every substance contains 6 X 10²³ molecules
therefore,
mass of 6 X 10²³ molecules= ( 44 X 6 X 10²³) ÷ (2 X 10²°) =132000 mg= 132 g