SAT2化学题A solid cube of iron whose edge is 4 inches weight 20.8 lbs.What is the specific gravity of this sample of iron?Water weights 62.4 pounds percubic foot.(A)4.5(B)5.2(C)9.0(D)27(E)324实在是不懂这些单位如何换
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H2O:62.4lbs/ft^3
Fe:20.8lbs/(1/3ft)^3=561.6lbs/ft^3
(1 foot = 12 inches,1 inch =1/12 foot)
s.g.=561.6/62.4*1.00=9.0