Questions asked by Sheli F.

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• One soluble 18.0% ammonium sulfate has a density of 1.10 g / mL. a) How many grams (NH4)2SO4 are needed to prepare 275 mL of this solution? b)How much mL of this solution are found im 90.0 g of ammonium sulfate?
  
• 2.5 g of a chemical compound containing C,H and N is burned with excess oxygen and 6.78 g of CO2, 1.94 g of H20 and N2 are obtained. Determine the empirical and molecular formula of this compound when its molecular mass is 81 g / mol?