Question

a chemist mixes 70. g of carbon tetrachloride with 33. g of isopropenylbenzene and 56. g of thiophene. calculate the percent by mass of each component of this solution. be sure each of your answer entries has the correct number of significant digits. carbon tetrachloride isopropenylbenzene thiophene

Explanation:

Step1: Calculate the total mass of the solution

The total mass \(m_{total}\) is the sum of the masses of each component.
\(m_{total}=70. + 33. + 56. = 159\space g\)

Step2: Calculate the mass percent of carbon tetrachloride

The mass percent formula is \(\text{Mass}\%=\frac{m_{solute}}{m_{total}}\times100\%\)
For carbon tetrachloride (\(m = 70.\space g\)), \(\text{Mass}\%=\frac{70.}{159}\times 100\% \approx 44.0\%\)

Step3: Calculate the mass percent of isopropenylbenzene

For isopropenylbenzene (\(m = 33.\space g\)), \(\text{Mass}\%=\frac{33.}{159}\times 100\% \approx 20.8\%\)

Step4: Calculate the mass percent of thiophene

For thiophene (\(m = 56.\space g\)), \(\text{Mass}\%=\frac{56.}{159}\times 100\% \approx 35.2\%\)

Answer:

component	mass percent
isopropenylbenzene	\(20.8\%\)
thiophene	\(35.2\%\)