help with 1 & 2

Suppose a student starts with 2.4309g of a sand mixture and separates the components into 1.3012g of NaCl, 0.5324g of SiO2, and 0.4503g of CaCO3. Based on the amount of recovered SiO2, what is the percent of SiO2 in the starting mixture? Suppose a 17.3970g sample of a NaCl and KCl mixture contains 5.4497g of NaCl. What is the percent of KCl in the mixture? Type