Question

A certain chemical reaction releases 37.7 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass
of reactant will produce 1020. J of heat?
Set the math up. But don't do any of it. Just leave your answer as a math expression.
Also, be sure your answer includes all the correct unit symbols.

Answer 1

The reactant of mass 0.0270 gm will produce 1020 J of heat.

Given,

A chemical reaction releases heat for each gram of reactant consumed = 37.7 KJ/g

We have to find the mass of the reactant which produces 1020 J of heat.

Let the mass of the reactant = x gm

Heat = 37.7 KJ/gm

or, heat = 37,700 J/gm

The amount of heat released for 1 gm = 37700 J/gm

Then, the heat released for x gm -

x (37700) = 1020 J

or, x =  0.0270 gm

Therefore, the reactant of mass 0.0270 gm produces 1020 J of heat.

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