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

Answer: (B)

Verified step by step guidance

1. Identify the given quantity: 8.5 × 10^{24} molecules of sodium sulfate (Na_2SO_4).
2. Recall that 1 mole of any substance contains Avogadro's number of molecules, which is approximately 6.022 × 10^{23} molecules/mole.
3. Set up the conversion from molecules to moles using the formula: \(\text{moles} = \frac{\text{number of molecules}}{\text{Avogadro's number}}\).
4. Substitute the given values into the formula: \(\text{moles} = \frac{8.5 \times 10^{24}}{6.022 \times 10^{23}}\).
5. Perform the division to find the number of moles (do not calculate the final value here, just set up the expression).