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Calculate the mass percent of 4.20g of NaCl in 164.01g of water Do i need to add 4.2 to 164.01 or does grams of H2O assume pre-dissolution? If R is the relative density of the solid, prove that d1 = R (d1 — d2)? The perimeter below of the triangle below is 68 units. find the value of z? Negative four plus 3n equals 37? Doing a discussion on biotechnology?