Dinitrogen oxide (or nitrous oxide), \( \mathrm{N}_{2} \mathrm{O} \), also known as laughing gas, is widoly used as an anesthetic in dontistry. How many grams are in 1.35 moles of dinitrogen axide? Express your answer using thiree significant figures.

1. Determine the molar mass of dinitrogen oxide, \( \mathrm{N}_2\mathrm{O} \). - Nitrogen has an atomic mass of approximately \( 14.0\,\mathrm{g/mol} \). - Oxygen has an atomic mass of approximately \( 16.0\,\mathrm{g/mol} \). - Thus, the molar mass is \[ 2(14.0\,\mathrm{g/mol}) + 16.0\,\mathrm{g/mol} = 28.0\,\mathrm{g/mol} + 16.0\,\mathrm{g/mol} = 44.0\,\mathrm{g/mol}. \] 2. Use the formula for converting moles to grams: \[ \text{mass} = \text{moles} \times \text{molar mass}. \] 3. Substitute the given values: \[ \text{mass} = 1.35\,\text{moles} \times 44.0\,\mathrm{g/mol} = 59.4\,\mathrm{g}. \] Thus, there are \( 59.4\,\mathrm{g} \) in \( 1.35 \) moles of dinitrogen oxide.