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How many hydrogen atoms are present in 2 moles of H_2O?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many moles of iron (Fe) are present in 279 g of iron? (Molar mass of Fe = 55.85 g/mol)
A
1.99 mol
B
5.00 mol
C
2.00 mol
D
0.200 mol
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검증된 단계별 안내1
Identify the given information: the mass of iron (Fe) is 279 g, and the molar mass of Fe is 55.85 g/mol.
Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
Substitute the given values into the formula: \(\text{moles of Fe} = \frac{279\ \text{g}}{55.85\ \text{g/mol}}\).
Perform the division to find the number of moles of iron present (do not calculate the final value here, just set up the expression).
Interpret the result to determine which answer choice is closest to the calculated number of moles.
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