객관식
What is the total number of atoms present in 1.0 mole of CO_2?
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2. Atoms & Elements
Mole Concept
객관식
If you have 0.5 moles of NaCl, how many formula units of NaCl do you have?
A
1.00 × 10^{22} formula units
B
1.20 × 10^{24} formula units
C
3.01 × 10^{23} formula units
D
6.02 × 10^{23} formula units
검증된 단계별 안내1
Understand that the problem asks to convert moles of NaCl to the number of formula units. A mole is a counting unit in chemistry that corresponds to Avogadro's number of entities (atoms, molecules, formula units, etc.).
Recall Avogadro's number, which is approximately \(6.02 \times 10^{23}\) entities per mole. This means 1 mole of any substance contains \(6.02 \times 10^{23}\) formula units.
Set up the conversion using the given amount of moles and Avogadro's number: multiply the number of moles by Avogadro's number to find the number of formula units.
Write the calculation as: \(\text{Number of formula units} = 0.5 \text{ moles} \times 6.02 \times 10^{23} \frac{\text{formula units}}{\text{mole}}\).
Perform the multiplication to find the total number of formula units (note: the problem asks for the process, so do not calculate the final number here).
