객관식
A gold ring contains 1.806 × 10^{24} atoms of gold (Au). How many moles of gold are in the ring?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many moles are present in 8.5 × 10^{24} molecules of sodium sulfate (Na_2SO_4)?
A
141 moles
B
14.1 moles
C
1.41 moles
D
0.141 moles
검증된 단계별 안내1
Identify the given quantity: 8.5 × 10^{24} molecules of sodium sulfate (Na_2SO_4).
Recall that 1 mole of any substance contains Avogadro's number of molecules, which is approximately 6.022 × 10^{23} molecules/mole.
Set up the conversion from molecules to moles using the formula: \(\text{moles} = \frac{\text{number of molecules}}{\text{Avogadro's number}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{8.5 \times 10^{24}}{6.022 \times 10^{23}}\).
Perform the division to find the number of moles (do not calculate the final value here, just set up the expression).
