Question

What is the mass of 3.2 moles of Nitrogen Oxide (NO)?

A) 144.2 g
B) 96.1 g
C) 48.0 g
D) 64.0 g

Answer 1

The mass of 3.2 moles of Nitrogen Oxide (NO) is calculated by multiplying the number of moles by the molar mass of NO (30 g/mol), resulting in a mass of 96 grams.

Step-by-step explanation:

To calculate the mass of 3.2 moles of Nitrogen Oxide (NO), we must first determine the molar mass of NO. The molar mass is the sum of the atomic masses of the elements in the compound, calculated as:

M(NO) = (1 mol nitrogen) (14 g/mol) + (1 mol oxygen) (16.0 g/mol) = 30 g/mol

Now, we can use the molar mass to find the mass of 3.2 moles of NO:

Mass = moles × molar mass

Mass = 3.2 moles × 30 g/mol = 96 g

Therefore, the mass of 3.2 moles of Nitrogen Oxide (NO) is 96 grams, which corresponds to option B.

Answer 2

Moles cancel out leaving the answer in grams. The closest choice is B. The difference could be due to round off error or the table used.