Answer to Question #338147 in General Chemistry for Sam

Question

if 100cm of hydrogen is sparked with 40cm3 of oxygen to produce H2O at s.t.p, calculate the volume of the gas that is in excess

Answer 1

2H₂ + O₂ =2 H₂O

n(H₂) = 0.1 L / 2*22.4 mol/L = 0.0022 moles

n(O₂) = 0.04 L / 22.4 mol/L = 0.0017 moles

H₂ - is in excess

V (H₂) =( 0.04L • 2•22.4 mol/L) / 22.4 mol/L = 0.08 L