How many molecules of ammonia (NH_3) are present in 10.4 moles of ammonia?

• A. 1.73 × 10^{24} molecules
• B. 3.14 × 10^{25} molecules
• C. 6.26 × 10^{24} molecules
• D. 6.02 × 10^{23} molecules

Answer: (C)

Verified step by step guidance

1. Identify the given quantity: 10.4 moles of ammonia (NH_3).
2. Recall Avogadro's number, which is the number of molecules in one mole of any substance: \$6.022 \times 10^{23}$ molecules/mole.
3. Set up the calculation to find the total number of molecules by multiplying the number of moles by Avogadro's number: \(\text{Number of molecules} = \text{moles} \times 6.022 \times 10^{23}\).
4. Substitute the given value into the equation: \(\text{Number of molecules} = 10.4 \times 6.022 \times 10^{23}\).
5. Perform the multiplication to find the total number of ammonia molecules present in 10.4 moles.