Question

20.0 grams of water decomposes into hydrogen gas and oxygen gas through electrolysis. If the percent yield is 80.0%, what mass of oxygen gas is produced?

Answer 1

Mass of oxygen gas produced : 14.08 g

Further explanation

Reaction

2H₂O(l)⇒2H₂(g)+O₂(g)

mol of H₂O (MW=18 g/mol) :

`\tt (20)/(18)=1.1`

mol O₂ :

`\tt (1)/(2)* 1.1=0.55`

mass O₂ (theoretical) :

`\tt 0.55* 32=17.6~g`

mass O₂ (actual) :

`\tt =\%yield* theoretical\\\\=0.8* 17.6=14.08`