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ololo11 [35]
4 years ago
11

If reactants A and B contain a total of 248 kJ of chemical energy, and products C and D contain a total of 841 kJ of chemical en

ergy, is the reaction endothermic or exothermic?
Chemistry
2 answers:
defon4 years ago
5 0

The answer is endothermic.


nika2105 [10]4 years ago
5 0

Answer:

Reaction is endothermic

Explanation:

The given reaction is :

A + B → C + D

The enthalpy change of a reaction (ΔH) is given by the difference between the enthalpy of the products and that of the reactants.

ΔH = H(products) - H(reactants) ------(1)

Now, enthalpy is a form of chemical energy which is essentially a measure of the heat content of the system. It is given that:

Chemical energy of reactants (A+B) = 248 kJ

Chemical energy of products (C+D) = 841 kJ

Based on equation (1) we have:

ΔH = H(C+D) - H(A+B) = 841-248 = +593 kJ

Since, the enthalpy change is positive, this implies that the reaction is endothermic i.e. energy is absorbed or required to carry out the reaction.

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Allison needs 18 liters of a 5% saline solution. She has a 1% solution and a 10% solution available. How many liters of the 1% s
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10 liters of the 1% solution and 8 liters of the 10% solution she should mix to make the 5% solution.

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<u>10 liters of the 1% solution and 8 liters of the 10% solution she should mix to make the 5% solution.</u>

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