객관식
What is the mass of 4 moles of helium (He)?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What mass (in kg) does 5.01 moles of iron (Fe) have? (Molar mass of Fe = 55.85 g/mol)
A
0.559 kg
B
0.055 kg
C
0.140 kg
D
0.280 kg
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검증된 단계별 안내1
Identify the given information: number of moles of iron (Fe) is 5.01 moles, and the molar mass of Fe is 55.85 g/mol.
Recall the formula to calculate mass from moles: \(\text{mass} = \text{moles} \times \text{molar mass}\).
Calculate the mass in grams by multiplying the moles by the molar mass: \(\text{mass (g)} = 5.01 \times 55.85\).
Convert the mass from grams to kilograms by dividing by 1000: \(\text{mass (kg)} = \frac{\text{mass (g)}}{1000}\).
Compare the calculated mass in kilograms to the given options to identify the correct answer.
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