2co (g) + c (g) -> c3o2 (g)
delta h = 127.3 kj/mol (rxn)
the equation above represents an endothermic reaction between co(g) and c(g). what is the amount of heat absorbed when 1.00 mol of co reacts with an excess c?

a) 31.8 kj
b)63.7 kj
c)127.3 kj
d)254.6 kj

b) 63.7 kJ

Explanation:

we have ΔH = 127.3 kJ/mol  

for 1.00 mole of CO the equation can be re-written as,

since the number of moles are halved  ΔH also gets halved as per Hesse's law of constant summation,

ΔH =    

      =  63.7 kJ

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

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