Question

topic 2 assessment
21 of 30 14:47 / 40:00
consider the table above. in a sample of 100.0 grams of sucrose, what would be the expected mass of hydrogen?
51.30 grams
6.50 grams
42.20 grams
100.0 grams

Explanation:

Step1: Determine molar mass of sucrose

The chemical formula of sucrose is $C_{12}H_{22}O_{11}$. Molar - mass of $C_{12}H_{22}O_{11}$: $12\times12 + 22\times1+11\times16=144 + 22+176 = 342\ g/mol$.

Step2: Determine mass fraction of hydrogen in sucrose

Mass of hydrogen in one mole of sucrose is $22\times1 = 22\ g$. Mass - fraction of hydrogen, $w_H=\frac{22}{342}$.

Step3: Calculate mass of hydrogen in 100.0 g of sucrose

Mass of hydrogen, $m_H=100.0\ g\times\frac{22}{342}\approx6.50\ g$.

Answer:

6.50 grams