Question

How many mol of hydrogen in 2.7 mol of caffeine?

Answer 1

n(C₈H₁₀N₄O₂)=2.7 mol

n(H)=10n(C₈H₁₀N₄O₂)

n(H)=10·2.7=27 mol

Answer 2

Answer : The number of moles of hydrogen in 2.7 mole of caffeine are 27 moles.

Explanation : Given,

Moles of caffeine = 2.7 mole

The molecular formula of caffeine is, $C_8H_{10}N_4O_2$

In the molecule $C_8H_{10}N_4O_2$, there are 8 moles of carbon, 10 moles of hydrogen, 4 moles of nitrogen and 2 moles of oxygen.

As, 1 mole of $C_8H_{10}N_4O_2$ contains 10 moles of hydrogen

So, 2.7 moles of $C_8H_{10}N_4O_2$ contains $2.7\times 10=27$ moles of hydrogen

Therefore, the number of moles of hydrogen in 2.7 mole of caffeine are 27 moles.