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xxMikexx [17]
3 years ago
7

ObIel WiLll unt COl.. USSMS A certain chemical reaction releases 31.2 kJ/g of heat for each gram of reactant consumed. How can y

ou calculate what mass of reactant will produce 1080. 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. mass X ? Explanation Check ducabon ARghtsserved T of Ue Phacy The I'm esc
Chemistry
2 answers:
Maksim231197 [3]3 years ago
7 0

Answer:

1. The expression is: m=\frac{E}{\Delta _rH}

2. The computed mass is: m=0.0346g

Explanation:

Hello,

In this case, we know the so called enthalpy of reaction whose symbol and value is shown below:

\Delta _rH=31.2\frac{kJ}{g}

In addition, we know that the energy released by the involved reactant is:

E=1080 J

Therefore, the expression to compute the required mass, based on the given units is:

m=\frac{E}{\Delta _rH}

Finally, the computed mass turns out:

m=\frac{1080J*\frac{1kJ}{1000J} }{31.2\frac{kJ}{g}} \\m=0.0346g

Best regards.

aleksandr82 [10.1K]3 years ago
5 0

Answer:

The expression to calculate the mass of the reactant is m = \frac{1.080kJ}{31.2kJ/g}

Explanation:

<em>The amount of heat released is equal to the amount of heat released per gram of reactant times the mass of the reactant.</em> To keep to coherence between units we need to transform 1,080 J to kJ. We do so with proportions:

1,080J.\frac{1kJ}{10^{3}J } =1.080kJ

Then,

1.080kJ=31.2\frac{kJ}{g} .m\\m = \frac{1.080kJ}{31.2kJ/g}

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