객관식
A chloride of rhenium contains 63.6% rhenium by mass. What is the empirical formula of this compound?
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
A student weighed 0.550 g of lithium chloride (LiCl). What is the number of moles of LiCl in the sample? (Molar mass of LiCl = 42.39 g/mol)
A
0.0130 mol
B
0.0424 mol
C
0.0078 mol
D
0.0232 mol
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검증된 단계별 안내1
Identify the given information: the mass of lithium chloride (LiCl) is 0.550 g, and the molar mass of LiCl is 42.39 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: \(\text{moles of LiCl} = \frac{0.550\ \text{g}}{42.39\ \text{g/mol}}\).
Perform the division to find the number of moles of LiCl in the sample.
Compare your calculated value with the provided options to select the correct number of moles.
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