Question

10. A student weight out a 25 g sample of NaCl, SiO2 and NH4Cl. The student determines the sample contains 3.0 g NH4Cl and 7.0 g SiO2. What is the percentage of NaCl by mass (weight) in the sample?
mass NaCl = 25.0g-mass NH4Cl - mass SiO2.
% NaCl = (mass NaCl/mass sample)*100 = ?

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