Question

Propane has the formula c3h8. if a sample of propane contains 0.20 moles of c, how many moles of h are present?

Answer 1

Answer: In the given sample, 0.533 moles of hydrogen will be present.

Explanation:

We are given a chemical compound having formula $C_3H_8$

We are provided with 0.20 moles of carbon atoms.

As, for every 3 moles of carbon atoms, 8 moles of hydrogen atoms are present.

So, for 0.20 moles of carbon atoms, $\frac{8}{3}\times 0.20=0.533moles$ of hydrogen atoms will be present.

Hence, in the given sample, 0.533 moles of hydrogen will be present.

Answer 2

Solving this problem only requires the knowledge of stoichiometry. We are given the compound propane C3H8. From the chemical formula, we can see that for every 3 moles of C, there are 8 moles of H. Therefore:

moles of H = 0.20 moles C * (8 moles H / 3 moles C)

moles of H = 0.53 moles H