A chemical reaction occurs that involves combining 1 atom of zinc with 2 atoms of hydrogen and 2 atoms of chlorine. After the reaction, how many atoms of each element will there be? * 1 zinc, 2 hydrogen, 2 chlorine O 2 zinc, 2 hydrogen, 2 chlorine 2 zinc, 1 hydrogen, 2 chlorine 2 zinc, 2 hydrogen, 3 chlorine

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Ответ:

00bebebeauty00

27.01.2022

Chemistry

The enthalpy of the reaction is -123.5 kJ.

Explanation:

$P4 (s) + 6 Cl_2 (g)\rightarrow 4 PCl_3 (l) ,\Delta H_1 =-1280 kJ$ ..(1)

$P4 (s) + 10 Cl_2 (g)\rightarrow 4 PCl_5 (l) ,\Delta H_2 =-1774 kJ$ ..(2)

$PCl_3 (l) + Cl_2(g)\rightarrow PCl_5(s),\Delta H_{rxn}=x$ ...(3)

(2) - (1)

$4PCl_3 (l) + 4Cl_2(g)\rightarrow 4PCl_5(s),\Delta H_{rxn}=y$

Dividing equation by 4 we get (3)

$PCl_3 (l) + Cl_2(g)\rightarrow PCl_5(s),\Delta H_{rxn}=\frac{y}{4}$ ...(3)

$\Delta H_{rxn}=y=(-1774 kJ)-(-1280 kJ)=-494 kJ$

$\Delta H_{rxn}=x=\frac{y}{4}={-494 kJ}{4}=-123.5 kJ$

The enthalpy of the reaction is -123.5 kJ.

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