Homework Help: Science

Posted by Shangkary on Monday, October 17, 2011 at 2:38am.

Calculate the mass percent of sand, sodium chloride and copper (II) sulfate in a sample which yields the following data: mass of sample = 1.088g, mass of sand = 0.2255g, mass of copper (II) oxide = 0.1994g (assume 100% yield for each of the copper (II) reactions). The reactions are as follows:
CuSO4 (aq) + 2NaOH (aq) = Cu(OH)2 (s) + Na2SO4 (aq)
Cu(OH)2 (s) = CuO (s) + H2O (l)

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