Question

You start with 12.94 g sample of a mixture containing SiO2, NaCl, and NH4Cl. If after subliming

Answer 1

Answer:

83.23 %

Explanation:

We are given;

• Mass of the sample mixture is 12.94 g
• Mass of the remaining mixture after sublimation is 2.17 g

We are required to get the mass percent of NH₄Cl in the original sample

Step 1 : Calculate mass of NH₄Cl in the original sample;

Mass of NH₄Cl = Total mass of the mixture - remaining mass after sublimation

                         = 12.94 g - 2.17 g

                          = 10.77 g

Step 2: Percent by mass of NH₄Cl in the original sample

% of NH₄Cl by mass =(Mass of NH₄Cl÷Total mass of original sample)×100

                                  = (10.77 g ÷ 12.94 g) × 100

                                  = 83.23 %

Therefore, the percent by mass of NH₄Cl in the original sample is 83.23%