Use the concept of mass percent to do the following conversion. A certain rock contain iron...
Use the concept of mass percent to do the following conversion. A certain rock contain iron ore, the ore is 45.57% iron, if the rock has a mass of 3.49 lb then how many gram of iron are in the rock? (enter your answer with a whole number and no units)
Homework Answers
1 lb = 453.592 gm then
3.49 lb = 3.49 X 453.592 = 1583.03608 gm
mass of ore = 1583.03608 gm
mass of iron in ore = 45.57 %
we know the m/m % formula
mass of solute = mass of solution X mass % of solute / 100
substitute value
mass of iron = 1583.03608 X 45.57 / 100 = 721.39 gm 
721
gm
mass of iron = 721 gm
Ans = 721
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