Question

a 1 g sample of the compound hydrogen chloride was analyzed and found to be 2.74 percent hydrogen and 97.3 percent chlorine. what percentage of hydrogen is present in a 2 g sample of hydrogen chloride?

a) 5.5%
b) 1.4%
c) 2.7%
d) 97.3%

Explanation:

Step1: Understand compound composition

The percentage composition of elements in a pure compound is constant regardless of the sample size.

Step2: Recall given percentage

The 1 - g sample of hydrogen chloride has 2.74% hydrogen. So, a 2 - g sample will also have 2.74% hydrogen. Rounding to one decimal place gives 2.7%.

Answer:

C. 2.7%