Question

a carbohydrate contains c, h, and o. a 10.00 g sample of the compound burns in excess oxygen, generating 27.462 g co₂ and 11.242 g h₂o. how many moles of hydrogen are in the sample? ? mol h do not round! include lots of digits in your answer since this is part of a larger calculation.

Explanation:

Step1: Find moles of \(H_2O\)

Molar mass of \(H_2O\) is \(18.01528\space g/mol\). Moles of \(H_2O=\frac{mass\space of\space H_2O}{molar\space mass\space of\space H_2O}=\frac{11.242\space g}{18.01528\space g/mol}\)

Step2: Find moles of H

Each \(H_2O\) has 2 H atoms. So moles of H = \(2\times\) moles of \(H_2O\)
First, calculate moles of \(H_2O\): \(\frac{11.242}{18.01528}\approx0.624023\)
Then moles of H: \(2\times0.624023 = 1.248046\)

Answer:

\(1.248046\)