The laughing gas weighs 33 g. determine its amount of substance.

m (laughing gas) = 33 g.
Let’s determine the amount of laughing gas. We write down the solution.
We write down the formula for laughing gas: N2O.
Next, we use the following formula.
n = m / M.
Where n is the amount of substance.
m is the mass of the substance.
M is the molar mass of the substance.
M (N2O) = 14 * 2 + 16 = 28 + 16 = 44 g / mol.
n = 33/44 = 0.75 g / mol.
This means that the amount of laughing gas substance is 0.75 mol.
Answer: the amount of substance is 0.75 mol.