MATHEMATICS · Subjective · CBSE · Mathematics · Fractions in Disguise · Fractions in Disguise
Problem
A wet mineral sample consists of sand, NaCl, and water. The mass of the wet sample is 18.764 g. After heating to constant mass, the dry residue (sand + NaCl) weighs 12.483 g. If the mass of sand in the dry residue is 7.215 g, determine the mass percent of NaCl in the original wet sample. Give your answer to three significant figures.