1. In a hydrogen fuel cell, hydrogen gas and oxygen gas are combined to form water. (1) Write the balanced chemical equation describing this reaction using the lowest whole number coefficients. (2) Identify the oxidizing agent and reducing agent. (3) Determine the number of electrons transferred in the balanced chemical equation

Explanation:

Hydrogen + Oxygen --> Water

(1) Write the balanced chemical equation describing this reaction using the lowest whole number coefficients.

2H2(g) + O2(g) ---> 2H2O(g)

(2) Identify the oxidizing agent and reducing agent.

Oxidizing agent = O (There is decrease in oxidation number from 0 to -2)

Reducing agent = H (There is increase in oxidation number form 0 to  +1)

(3) Determine the number of electrons transferred in the balanced chemical equation

2H2(g) -->  4H+   + 4e- (4 hydrogen atom lost a single electron each)

O2 + 4e-  --> 2O2- (Two oxygen gain 2 electrons each)

Total number of electrons transferred in the balanced chemical equation is 4.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.