Question

select the correct answer.
if the atomic weight of nitrogen is 14.01, what is the mass of the nitrogen atoms in one mole of cadmium nitrate, cd(no₃)₂?
a. 14.01 grams
b. 28.02 grams
c. 42.03 grams
d. 84.06 grams

Explanation:

Step1: Analyze the formula of cadmium nitrate

In \(Cd(NO_3)_2\), there are 2 \(NO_3\) groups. Each \(NO_3\) group has 1 nitrogen atom. So, in one mole of \(Cd(NO_3)_2\), the number of moles of nitrogen atoms is \(n = 2\times1= 2\) moles.

Step2: Calculate the mass of nitrogen atoms

The formula for mass \(m=n\times M\), where \(n\) is the number of moles and \(M\) is the molar mass. Given \(M = 14.01\space g/mol\) (atomic weight of nitrogen) and \(n = 2\space mol\). Then \(m=2\times14.01\space g/mol\times1\space mol=28.02\space g\).

Answer:

B. 28.02 grams