Question

a sample contains carbon and hydrogen in the amounts shown in the data table. what is the percent hydrogen in the compound?
sample mass c (g) mass h (g) total mass (g)
a 15.0 5.0 20.0
33%
75%
0.75%
25%

Explanation:

Step1: Define mass percent formula

Percent H = $\frac{\text{Mass of H}}{\text{Total Mass}} \times 100\%$

Step2: Substitute given values

Substitute Mass H = 5.0 g, Total Mass = 20.0 g
Percent H = $\frac{5.0}{20.0} \times 100\%$

Step3: Calculate the percentage

Simplify and compute the value
Percent H = $0.25 \times 100\% = 25\%$

Answer:

D. 25%