Question

CH4, has a mass of 38.25 g. Calculate the number of methane molecules

Answer 1

1.43 x 10^24 molecules

Step-by-step explanation:

Molecular mass of methane = 12.01 + 4(1.01) = 16.05 g/mol

so mol of 38.25 g equals 38.25g x (1 mole/16.05g = 2.38 mol

1 mole = 6.022 x 10^23 molecules

so 2.38 mol will have 2.38 x 6.022 x 10^23 = 1.43 x 10^24 molecules