Question

select the correct answer.
if the atomic weight of nitrogen is 14.0, what is the mass of one mole of nitrogen gas (n₂)?
a. 14.0 g
b. 14.0 kg
c. 28.0 mg
d. 28.0 g

Explanation:

Step1: Determine the molar mass of one nitrogen atom

The atomic weight of nitrogen (\(N\)) is given as \(14.0\space g/mol\).

Step2: Calculate the molar mass of \(N_2\)

Since \(N_2\) has two nitrogen atoms, we multiply the molar mass of one \(N\) atom by \(2\).

$$M(N_2)=2\times M(N)$$

$$M(N_2)=2\times14.0\space g/mol = 28.0\space g/mol$$

This means the mass of one mole of \(N_2\) gas is \(28.0\space g\).

Answer:

D. 28.0 g