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

Answer: (A)

Verified step by step guidance

1. 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.
2. Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
3. Substitute the given values into the formula: \(\text{moles of LiCl} = \frac{0.550\ \text{g}}{42.39\ \text{g/mol}}\).
4. Perform the division to find the number of moles of LiCl in the sample.
5. Compare your calculated value with the provided options to select the correct number of moles.