Question

How many atoms are there in 39.9 g of methane (CH4)?

Answer 1

You can convert from grams to moles using the molar mass of methane,
then using Avogadro's number convert from moles to molecules.

Each molecule has 5 atoms, so multiply by 5 and you should have your answer.

Answer 2

thank you very much

Answer 3

you're welcome ^^