kmkrreeves56801 kmkrreeves56801 12-01-2024 Chemistry contestada A+ student measures 1.5815 g of a mixture of sand and sodium carbonate, which is later determined to be 30.81% sand. What mass of Na2CO3 was in the original mixture? a) 0.958 g b) 1.162 g c) 2.302 g d) 4.588 g