Multiple Choice
A solution is prepared by mixing 2.0 mol of hexane (C6H14) with 3.0 mol of heptane (C7H16), assuming ideal behavior. What is the mole fraction of hexane in the solution?
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2. Atoms & Elements
Mole Concept
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Given that the molar mass of LiF is 25.94 g/mol, how many moles of LiF are present in a 10.37 g sample?
A
0.038 moles
B
2.50 moles
C
0.250 moles
D
0.400 moles
Verified step by step guidance1
Identify the given information: the mass of the LiF sample is 10.37 g, and the molar mass of LiF is 25.94 g/mol.
Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{10.37}{25.94}\).
Perform the division to find the number of moles of LiF in the sample.
Compare your calculated value with the provided options to select the correct number of moles.
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