The mass of a hydrogen atom is 1.67 × 10-24
grams. The mass of a carbon atom is 1.99 × 10-23 grams.
A molecule of methane contains 4 atoms of hydrogen and 1 atom of carbon.
a) Calculate the mass of one molecule of methane, giving your exact answer in standard form.
b) Calculate the number of molecules in 1 gram of methane, giving your answer in standard form to 3 significant figures.