If you have 92 grams of nitrogen dioxide (NO_2), how many moles of NO_2 are present?

• A. 3.3 moles
• B. 1.0 mole
• C. 2.0 moles
• D. 0.5 mole

Answer: (C)

Verified step by step guidance

1. Identify the molar mass of nitrogen dioxide (NO\_2). To do this, sum the atomic masses of nitrogen (N) and oxygen (O) atoms in the molecule. Nitrogen has an atomic mass of approximately 14.0 g/mol, and oxygen has an atomic mass of approximately 16.0 g/mol.
2. Calculate the molar mass of NO\_2 using the formula: \(\text{Molar mass of NO\_2} = 14.0 + 2 \times 16.0\) g/mol.
3. Use the formula to convert grams to moles: \(\text{moles} = \frac{\text{mass in grams}}{\text{molar mass}}\).
4. Substitute the given mass (92 grams) and the calculated molar mass into the formula: \(\text{moles of NO\_2} = \frac{92}{\text{molar mass of NO\_2}}\).
5. Perform the division to find the number of moles of NO\_2 present in 92 grams.