How many moles are present in 2.5 g of N_2?

• A. 0.56 moles
• B. 0.18 moles
• C. 1.25 moles
• D. 0.089 moles

Answer: (D)

Verified step by step guidance

1. Identify the given information: the mass of nitrogen gas (N\_2) is 2.5 grams.
2. Calculate the molar mass of N\_2 by adding the atomic masses of two nitrogen atoms. Since the atomic mass of nitrogen (N) is approximately 14.0 g/mol, the molar mass of N\_2 is calculated as \$14.0 \times 2$ g/mol.
3. Use the formula to find moles from mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
4. Substitute the known values into the formula: \(\text{moles} = \frac{2.5}{28.0}\), where 28.0 g/mol is the molar mass of N\_2.
5. Perform the division to find the number of moles present in 2.5 g of N\_2.