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1) How many grams of Carbon tetrachloride (a great degreaser but also a suspect carcinogen) do I need to weigh out (massing) if I want 4.21 moles of this compound?
2) If I mass out 237g of Silicon dioxide (main ingredient in the mixture we call sand), how many moles do I have of this compound?
Answer: 1) 648g 2) 3.95moles