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Stoichiometric Calculations

Question 12 • LA-Chemistry A

Consider again the thermite reaction. If 0.0257 g Al react completely, what mass of Fe forms? Use the periodic table to find molar masses.Fe2O3 + 2Al Al2O3 + 2FeThe correct setup allows you to cancel terms to yield the mass of iron: 0.0257 gram upper A l with grams upper A l crossed out times StartFraction 1 mole upper A l with mole upper A l crossed out over 26.98 grams upper Al with grams upper A l crossed out EndFraction times StartFraction 2 moles upper F e with moles upper F e crossed out over 2 moles upper A l with moles upper A L crossed out EndFraction times StartFraction 55.85 grams upper Fe over 1 mole upper F e with mole upper F e crossed out EndFraction equals ? grams upper F e. What mass of Fe forms? Make sure to give your answer with the correct number of significant figures.A total of 0.0257 g Al forms 0.10641.435✔ 0.05320.213 g Fe.

Question illustration
Answer
A
0.1064
B
1.435
C
✔ 0.0532
D
0.213
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