Giving moles of methane,CH4

Question

Suppose you are given 3.0 moles of methane ,CH4

a]How many moles of carbon atoms do you have?

b] How many moles of hydrogen atoms do you have?

c] How many atoms of carbon do you have?

d] How many atoms of hydrogen do you have?

Answer 1

For every CH₄ you have, you have 1 C and 4 H. Thus, since we know that the moles of methane are 3, we know that we have:

a) 3 mol C atoms

b) 12 mol H atoms

To solve for the actual number of atoms for C and H, you must use Avogadro's number to convert from moles to number of atoms:

c) 3 mol C atoms x (6.022 x 10²³ C atoms/1 mol C atoms) = 1.807 x 10²⁴ C atoms

d) 12 mol H atoms x (6.022 x 10²³ H atoms/1 mol H atoms) = 7.226 x 10²⁴ H atoms