a 250 g sample is composed of 150 g of sodium...
a 250 g sample is composed of 150 g of sodium (na) and 100 g of chlorine (cl). what is the percent by mass of cl in the sample? 50% 70% 60% 40%
Answer
# Explanation:
## Step1: Recall the formula for mass - percent
The formula for mass - percent of a component in a sample is \(\text{Mass}\%=\frac{\text{Mass of component}}{\text{Mass of sample}}\times100\%\)
## Step2: Identify the values
The mass of \(Cl\) (component) \(m = 100\space g\), and the mass of the sample \(M=250\space g\)
## Step3: Substitute the values into the formula
\(\text{Mass}\%=\frac{100}{250}\times 100\%=\frac{100\times100\%}{250}\)
\[
\begin{align*}
\frac{100\times100\%}{250}&=\frac{10000\%}{250}\\
& = 40\%
\end{align*}
\]
# Answer:
\(40\%\) (the fourth option)