A sample of propane,
C3H8 has 3 carbon atoms, 3C~11.7moles
So answer is 11.7 moles/3=2.9 moles, the sample contain
Moles of H atom is 2.9 moles*8=23.2 moles
Total number of moles of carbon and hydrogen=11.7moles+23.2moles=34.9moles
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