객관식
Which statement correctly describes the quantities that can be determined if the number of moles of a substance is known?
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2. Atoms & Elements
Mole Concept
객관식
How many moles of carbon atoms are present in 18 g of carbon (C)?
A
3 moles
B
2 moles
C
1.5 moles
D
0.75 moles
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검증된 단계별 안내1
Identify the given information: the mass of carbon is 18 g, and you need to find the number of moles of carbon atoms.
Recall the molar mass of carbon (C), which is the mass of one mole of carbon atoms. The molar mass of carbon is approximately 12 g/mol.
Use the formula to calculate moles from mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
Substitute the known values into the formula: \(\text{moles} = \frac{18\ \text{g}}{12\ \text{g/mol}}\).
Perform the division to find the number of moles of carbon atoms in 18 g of carbon.
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