the first question is The second question is Calculate the standard enthalpy cha

Question

the first question is

The second question is

Calculate the standard enthalpy change for the reaction 2A + B ^ 2C + 2D Use the following data: Express your answer to three significant figures and include the appropriate units. What is for the following chemical reaction? CS2(g) + 2H20(1)->C02(g) + 2H2S(g) You can use the following table of standard heats of formation ( ) to calculate the enthalpy of the given reaction. Express the standard enthalpy of reaction to three significant figures and include the appropriate units.

Explanation / Answer

First reaction is

2A + B -> 2C+ 2D

WE Know that dH reaction = dh ( products )- dh(reactants)

= 2 dh C + 2 dh D - dh B - 2 dh A

=2 x 197 - 2 x 491 + 401 + 2 x 231

dh reaction = 275 kJ

for second reaction

CS2 + 2H20 _> C02 + 2 H2S

dH reaction = dh ( products )- dh(reactants)

= dh co2 + 2 dh h2s - dh cs2 - 2 dh h20

=-393.5 - 2 x 20.60-116.7 + 2 x 285.8

=-20.2 kJ

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