Question

Given the following balanced reaction between nitrogen gas and oxygen gas to produce nitrous oxide gas, how many moles of nitrous oxide gas are produced from 1.65 moles of nitrogen gas? N2+O2-->2NO

Answer 1

As you see on the reactants, there is current one mole of N2. If they want to change this to 1.65. They simply multiply everything by 1.65 (it's a ratio).

There are currently 2 moles of nitrous oxide, so multiply 1.65 x 2 to get the # of moles

Answer 2

Well, your first step is to check if they are stoichiometrically balanced.
Which it looks like it is. Then, you always want to start with what you're given. This is the pathway you're gonna take:

\(\sf \color{red}{1.65~mol~N_2} \times \frac{2~mol~NO}{1~mol~N_2}\)
that should tell you how many moles of nitrogen monoxide there are.

Answer 3

This is basically algebra, notice how the two units here "mol N\(_2\)" cancel out nicely.