The density of zinc is 455 lbs/cu.ft. Find the mass of 9 cu. cm. of zinc in grams.?



Answer:
You have lbs and want grams
You have cu. ft and want cu. cm
1 lb = 453.6 grams
1 cu ft = 0.02831701 cu meters
A cubic meter is 100 x 100 x 100 cu cm, so-
1 cu ft = 28317 cubic cm.
455 x 453.6 gms / 28317 cubic cm = 7.288 g/Cm^3
7.288 g x 9 cm^3 = 65.6 grams

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