The Moon and Earth have a similar composition and each contains 4.70% iron, which supports the theory that the Moon and Earth were originally a single planet. What is the mass of iron in a lunar sample that weighs 235 g?

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Strategy Plan STEP 1: What unit is asked for in the answer? STEP 2: What given value is related to the answer? STEP 3: What unit factor should we apply? From the definition of percent, 4.70 g iron 100 g sample; the two unit factors are 4.70 g iron/100 g sample, and its reciprocal 100 g sample/4.70 g iron. Unit Analysis Map given value 235 g sample Step 1: Step 2: Step 3: unit factor 4.70 g iron 100 g sample or 4.70 g iron 100 g sample 100 g sample 4.70 g iron g iron 235 g sample or 100 g sample 4.70 g iron unit in answer = ? g iron