How many molecules are present in 4 moles of ammonia (NH_3)?

• A. 2.41 \times 10^{24} atoms
• B. 2.41 \times 10^{24} molecules
• C. 2.41 \times 10^{24} molecules
• D. 4.00 \times 10^{23} molecules

Answer: (C)

Verified step by step guidance

1. Identify the quantity given: 4 moles of ammonia (NH_3).
2. Recall that 1 mole of any substance contains Avogadro's number of entities (atoms, molecules, etc.), which is approximately \$6.022 \times 10^{23}$ entities per mole.
3. Since ammonia is a molecular compound, the number of molecules in 4 moles is calculated by multiplying the number of moles by Avogadro's number: \(\text{Number of molecules} = 4 \text{ moles} \times 6.022 \times 10^{23} \text{ molecules/mole}\).
4. Perform the multiplication to find the total number of molecules present in 4 moles of NH_3.
5. Express the final answer in scientific notation to match the format of the options provided.