Multiple Choice
How many molecules are present in 48.0 grams of NaOH?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many molecules are present in 23 moles of oxygen (O_2)?
A
2.76 \(\times\) 10^{24} molecules
B
1.32 \(\times\) 10^{24} molecules
C
1.38 \(\times\) 10^{25} molecules
D
6.02 \(\times\) 10^{23} molecules
Verified step by step guidance1
Recall that one mole of any substance contains Avogadro's number of entities (atoms, molecules, ions, etc.), which is approximately \(6.022 \times 10^{23}\) entities per mole.
Identify the quantity given: 23 moles of oxygen molecules (\(O_2\)). We want to find the total number of oxygen molecules in these 23 moles.
Use the formula to calculate the number of molecules: \(\text{Number of molecules} = \text{moles} \times \text{Avogadro's number}\).
Substitute the values into the formula: \(\text{Number of molecules} = 23 \times 6.022 \times 10^{23}\).
Multiply the numbers (23 and 6.022) and keep the power of ten the same to find the total number of molecules present in 23 moles of oxygen.
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