객관식
The number of molecules of a chemical substance that is equal to its molecular weight in grams is called a(n):
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2. Atoms & Elements
Mole Concept
객관식
How many moles of atoms are present in 4.00 g of 13C?
A
0.308 mol
B
0.500 mol
C
0.154 mol
D
0.333 mol
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검증된 단계별 안내1
Identify the isotope and its atomic mass. Here, the isotope is carbon-13 (\(^{13}C\)), which has an atomic mass of approximately 13.00 g/mol.
Write down the given mass of the sample: 4.00 g of \(^{13}C\).
Use the formula to calculate moles from mass: \[ \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \]
Substitute the values into the formula: \[ \text{moles} = \frac{4.00 \text{ g}}{13.00 \text{ g/mol}} \]
Perform the division to find the number of moles of \(^{13}C\) atoms in the sample.
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