Question

A 171 g sample of tetrafluoromethane (CF4) contains 90 g of carbon. What is the mass percent of fluorine in the compound?

Answer 1

To find the mass percent of fluorine in the compound, you must first determine the mass in g of fluorine in the compound. We do this by subtracting the mass of carbon from the total mass of the sample. From this we get 171 - 90 = 81g of fluorine in CF4 sample. Now to get the mass percent, we divide the fluorine mass by the sample mass to get the percent mass. 81/171 = .4737 which multiplied by 100 to get percentage give 47.37%.

Answer 2

Answer : The mass percent of fluorine in the compound is, 47.36%

Explanation :

Mass percent : It is defined as the mass of the given component present in the total mass of the compound.

Formula used :

$\text{Mass} \%\text{ F}=\frac{\text{Mass of F}}{\text{Mass of }CF_4}\times 100$

First we have to calculate the mass of fluorine.

Mass of fluorine = Mass of $CF_4$ - Mass of C

Mass of fluorine = 171 - 90 = 81 g

Now put all the given values in this formula, we get the mass percent of fluorine in the compound.

$\text{Mass} \%\text{ F}=\frac{81g}{171g}\times 100=47.36\%$

Therefore, the mass percent of fluorine in the compound is, 47.36%