Question

a 250 g sample is composed of 131 g of potassium (k) and 119 g of chloride (cl). what is the percent by mass of k in the sample? 81.3% 52.4% 20.2% 47.6%

Explanation:

Step1: Recall the formula for mass percentage

The formula for mass percentage (\(\%\text{ by mass}\)) is \(\%\text{ by mass}=\frac{\text{mass of component}}{\text{total mass of sample}}\times100\%\)

Step2: Identify the values

Here, the mass of potassium (\(K\)) is \(m_{K} = 131\space g\) and the total mass of the sample \(m_{total}=250\space g\)

Step3: Substitute values into the formula

\(\%\text{ by mass of }K=\frac{131}{250}\times 100\%\)

$$
LATEXBLOCK0
$$

Answer:

B. \(52.4\%\)