Question

The molar mass of nitrogen (N2) is 28.02 g/mol. What is the mass, in grams, of 4.60 mol of N2?

Answer 1

If the molar mass of N2 is 28.02 g per 1 mole, then 4.6 moles of N2 is 4.6 times 28.02, or 128.892 g.

Answer 2

The correct answer is 129 grams.  

On the basis of the given data, the molar mass of nitrogen is 28.02 g/mol, the moles of nitrogen given is 4.60 mol. There is a need to calculate the mass of nitrogen.  

In order to calculate the mass, the formula to be used is:  

moles = mass (g) / molar mass (g/mol)

Now by putting the values we get,  

4.60 mol = mass / 28.02 g/mol

mass = 4.60 mol × 28.02 g/mol

mass = 128.892 g or 129 g

Thus, the mass of 4.60 mol of nitrogen is 129 g.