Thermal effect chemical reaction.
What of is the mass iron turned in iron (III) oxide, if as a result of reaction stood 112 kJ of heat? Thermochemical equation of the reaction: 3Fe + 2О2 = Fe3О4 +1118kJ.
given:
Q1 = 112 kJ
find:
m(Fe) - ?
Solution:
1118 kJ ------ 3 mol Fe,
112 kJ ------- х mol Fe.
х= (112 kJ • 3 mol)/(1118 kJ)=3 mol
М(Fе) = 56 g/mol
m(Fe) = 0,3 mol • 56 g/mol = 16,8 g.
Answer:m(Fe) = 16,8 g.