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?

Mass of oxygen gas produced : 14.08 g

Further explanation

Reaction

2H₂O(l)⇒2H₂(g)+O₂(g)

mol of H₂O (MW=18 g/mol) :

mol O₂ :

mass O₂ (theoretical) :

mass O₂ (actual) :

Mass of water is smething that you froma drug test or sum girl ya

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer