Automotive air bags inflate when sodium azide NaN3 decomposes. In preparation of the airbag a scientist reacts sodium with nitrogen to obtain sodium azide:
A) Balance the chemical reaction of this process:

Na (s) + ___N2 (g) → ___NaN3 (s)
B) If 50.0 g of sodium is reacted with 40.5 g of nitrogen according to the balanced chemical
reaction above what is the mass of sodium azide that can be obtained?
C) What is the limiting reagent in the reaction?
D) How much excess reagent left over when the reaction is complete?
E) What is the percent yield if the scientist obtained 34.5 g of sodium azide? Was this reaction
successful?

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.

c, liquids evaporate, creating a gas

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.