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tankabanditka [31]
3 years ago
10

3

Chemistry
1 answer:
sergey [27]3 years ago
7 0
It will be B, to your answer why it wouldn’t be D this is because CaCO3 Is poorly soluble in pure water this is because of the high electrostatic force of attraction the atoms are held so strongly together that you can not only break it easy but also cannot dissolve it
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Heat of reaction is the change of enthalpy during a chemical reaction with all substances in their standard states.

2CO_2(g)+2H_2O(l)\rightarrow C_2H_4(g)+3O_2(g) \Delta H=+1411.1kJ

Reversing the reaction, changes the sign of \Delta H

C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)

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On multiplying the reaction by \frac{1}{2} , enthalpy gets half:

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