객관식
Where would you look to find the molar mass of an element?
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2. Atoms & Elements
Calculating Molar Mass
객관식
If you weigh out 0.205 g of salicylic acid (C7H6O3), what is the number of moles of salicylic acid present? (Molar mass of C7H6O3 = 138.12 g/mol)
A
0.0148 mol
B
0.205 mol
C
0.138 mol
D
0.00148 mol
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검증된 단계별 안내1
Identify the given information: the mass of salicylic acid is 0.205 g, and the molar mass of salicylic acid (C7H6O3) is 138.12 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: \(\text{moles} = \frac{0.205}{138.12}\).
Perform the division to find the number of moles of salicylic acid present.
Compare your calculated value with the provided options to confirm the correct answer.
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