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* 10=27` moles of hydrogen

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