Multiple Choice
Which of the following best describes Avogadro's number?
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2. Atoms & Elements
Mole Concept
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How many molecules are present in 2.5 mol of NaCl?
A
6.02 × 10^{23} molecules
B
3.01 × 10^{24} molecules
C
2.5 × 10^{23} molecules
D
1.51 × 10^{24} molecules
Verified step by step guidance1
Understand that the problem asks for the number of molecules in a given amount of substance (2.5 mol of NaCl).
Recall Avogadro's number, which is the number of particles (atoms, molecules, ions) in one mole of a substance: \$6.02 \times 10^{23}$ particles/mol.
Use the formula to find the number of molecules: \(\text{Number of molecules} = \text{moles} \times \text{Avogadro's number}\).
Substitute the given values into the formula: \(\text{Number of molecules} = 2.5 \text{ mol} \times 6.02 \times 10^{23} \text{ molecules/mol}\).
Multiply the numbers and express the answer in scientific notation to find the total number of molecules in 2.5 mol of NaCl.
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