1.

A mixture contains 20% NaCl, 30% CH4 and 50% H2O, what is the mass percent of NaCl?(a) 21(b) 34(c) 45(d) 68

Answer» Right answer is (b) 34

Best explanation: Mass percent of NaCl = 20*35.5/[20*35.5 + 30*16 + 50*18] = 34%.


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