객관식
The mass of a mole of carbon atoms is 12.011 grams. What is the mass of a single atom of carbon?
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2. Atoms & Elements
Mole Concept
객관식
What is the total number of molecules of hydrogen in 0.25 mole of hydrogen gas (H_2)?
A
1.505 × 10^{23}
B
3.011 × 10^{23}
C
2.5 × 10^{22}
D
6.022 × 10^{23}
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검증된 단계별 안내1
Identify the given quantity: 0.25 mole of hydrogen gas (H\_2).
Recall that 1 mole of any substance contains Avogadro's number of molecules, which is \(6.022 \times 10^{23}\) molecules/mole.
Set up the calculation to find the total number of molecules by multiplying the number of moles by Avogadro's number: \(\text{Number of molecules} = 0.25 \times 6.022 \times 10^{23}\).
Perform the multiplication to find the total number of hydrogen molecules in 0.25 mole of H\_2.
Express the final answer in scientific notation to match the format of the given options.
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