객관식
Which part of the atom is the space surrounding the nucleus that has an overall negative charge?
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2. Atoms & Elements
The Atom
객관식
If you have 2.00 grams of 13C, how many atoms of 13C are present in this sample?
A
1.53 × 10^{22} atoms
B
1.20 × 10^{23} atoms
C
9.24 × 10^{22} atoms
D
6.02 × 10^{23} atoms
검증된 단계별 안내1
Identify the given information: mass of the sample is 2.00 grams of carbon-13 (\(^{13}C\)).
Recall the molar mass of carbon-13, which is approximately 13.00 grams per mole because the isotope number corresponds to the molar mass in grams per mole.
Calculate the number of moles of \(^{13}C\) in the sample using the formula:
\[ \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} = \frac{2.00}{13.00} \]
Use Avogadro's number (\(6.022 \times 10^{23}\) atoms/mol) to convert moles to atoms:
\[ \text{number of atoms} = \text{moles} \times 6.022 \times 10^{23} \]
Multiply the moles calculated in step 3 by Avogadro's number to find the total number of \(^{13}C\) atoms in the 2.00 gram sample.
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