Question

balance the equation ethanol plus oxygen gives carbondioxide and water​

Answer 1

The combustion equation is C2H5OH +3O2 = 2CO2 + 3H2O. ... So the equation answers that 3*0.51 mole of H2O is produced. 3*0.51 mole of H2O = 1.53 mole of water is produced when 0.51 mole of Ethanol is combined(burned in) with oxygen

Answer 2

$CH _{3}CH_{2}OH + 3O_{2} \frac{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }{ \: } > 2CO_{2} + 3H_{2} O$