Question #d0697

1 Answer
Sep 29, 2017

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