volume of gas of N2O4

Question

Consider the following chemical equation.

2NO2 →N2O4

If 25.0 mL of NO2 gas is completely converted to N2O4 gas under standard conditions, what volume will the N2O4 gas occupy?

Answer 1

Standard conditions are 1 atm and 273K

Also, if you consider the gas to be ideal, then 1 mole = 22.4 liters and volume is proportional to moles

From the balanced equation, 2 moles NO₂ produces 1 mole N₂O₄, so 2 ml NO₂ produces 1 ml N₂O₄.

25.0 ml NO₂ = 12.5 ml N₂O₄