Answer to Question #203360 in General Chemistry for Daniel

Question

10³ of hydrogen gas sparked with 20cm³ of oxygen, calculate the volumes of residual gasses after cooling

Answer 1

Volume of H₂ gas = 10 cm³, Volume of O₂ gas = 20 cm³

we know that at NTP volume of 1 mole gas = 22400 cm³

number of moles of H₂ = $\frac{10}{22400}= 0.000446$

number of moles of O₂ = $\frac{20}{22400}= 0.000892$

reaction between hydrogen and oxygen is as follows

$2H_2 + O_2 \longrightarrow 2H_2O$

from above reaction we can say that one mole of hydrogen reaction with 0.5 mole of oxyegn so here limiting reagent is hydrogen

and 0.000446 mole of Hydrogen react with 0.000223 mole of oxygen

mole of gas unreacted = 0.0006698 mole

volume of oxygen unreacted = 15 cm³