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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)

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Answer #1

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 \simeq 721 gm

mass of iron = 721 gm

Ans = 721

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