Question

Question #d0697

Answer 1

65 moles of hydrogen atoms, or more correctly,
`3.91 * 10^25` hydrogen atoms

Explanation:

First we calculate the number of moles of methane,
`n = (weight) / (molar mass)`

`implies n = 260/16 = 16.25` ( molar mass of methane = 16g/mol)

Hence 16.25 moles of methane are present, which implies that number of moles of hydrogen atoms = `(16.25) * (4) = 65`
This is because there are 4 hydrogen atoms in each molecule of methane.

65 moles of hydrigen atoms = `65 * N_A = 65 * 6.022 * 10^23`

which can be equivalently written as `3.91 * 10^25` hydrogen atoms