Question

a 50.0 g sample of an unknown compound contains 14.19 g na, 19.76 g o, and 16.05 g cr. what is the percent composition of na in the compound? % na

Explanation:

Step1: Recall the formula for percent composition

The formula for percent composition of an element in a compound is $\text{Percent Composition}=\frac{\text{Mass of Element}}{\text{Mass of Compound}}\times100\%$.

Step2: Substitute the given values into the formula

Here, the mass of the element (Na) is $m_{Na} = 14.19\ g$ and the mass of the compound is $m_{compound}=50.0\ g$.
So, $\text{Percent Composition of Na}=\frac{14.19}{50.0}\times 100\%$.

Step3: Perform the calculation

$\frac{14.19}{50.0}\times 100\%=(14.19\times2)\% = 28.38\%$.

Answer:

$28.38\%$