객관식
A cup of water contains 13.9 moles of water. How many molecules of water are in the cup?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many moles are present in 4.9 \(\times\) 10^{23} molecules of CO_2?
A
8.1 moles
B
1.2 moles
C
0.81 moles
D
0.49 moles
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검증된 단계별 안내1
Identify the given quantity: 4.9 \(\times\) 10^{23} molecules of CO_2.
Recall Avogadro's number, which is the number of molecules in one mole: 6.022 \(\times\) 10^{23} molecules/mole.
Set up the conversion from molecules to moles using the relationship: \(\text{moles} = \frac{\text{number of molecules}}{\text{Avogadro's number}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{4.9 \times 10^{23}}{6.022 \times 10^{23}}\).
Perform the division to find the number of moles (do not calculate the final value here, just set up the expression).
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