We know the density of the gas is 2.85 g/L and the molar mass of N2O is 44.013 g/mol. So, we can calculate the number of moles (n) using the formula:
\[ n = \frac{mass}{molar~mass} \]
Substituting the given values, we get:
\[ n = \frac{2.85~g}{44.013~g/mol} =
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