Which of the following equations is NOT balanced properly? Which of the following equations is NOT balanced properly? Cr2(SO4)3 + 6KOH → 2Cr(OH)3 + 3 K2SO4 2NaHCO3 → Na2CO3 + CO2 + H2O 4NH3 + 14O2 → 4NO2 + 6H2O 2Cr + 6HCl → 2CrCl3 + 3H2 none of the above

Balancing of equation involves making sure the number of atoms of an element on the left hand side(reactant) is equal to the number of atoms of an element on the right hand side(product)

4NH3 + 14O2 → 4NO2 + 6H2O

In the equation above,the number of Oxygen on the left is (14*2)=28 while the number of oxygen on the right is (4*2+6)=14. This makes it an unbalanced equation.

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.