객관식
What is the number of moles of solute present in 650 mL of a 0.40 molar (M) solution?
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2. Atoms & Elements
Mole Concept
객관식
How many atoms are present in 0.250 moles of Rb?
A
2.41 × 10^{22} atoms
B
3.01 × 10^{23} atoms
C
6.02 × 10^{22} atoms
D
1.51 × 10^{23} atoms
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검증된 단계별 안내1
Identify the quantity given: 0.250 moles of rubidium (Rb).
Recall that one mole of any substance contains Avogadro's number of particles (atoms, in this case), which is \(6.022 \times 10^{23}\) atoms/mole.
Set up the calculation to find the number of atoms by multiplying the number of moles by Avogadro's number: \(\text{Number of atoms} = 0.250 \text{ moles} \times 6.022 \times 10^{23} \text{ atoms/mole}\).
Perform the multiplication to get the total number of atoms (do not calculate the final value here, just set up the expression).
Express the answer in scientific notation to match the format of the options provided.
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