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4 Nov 2021

Given information

The sign of enthalpy change of the given processes and the endothermic or exothermic nature of the process is to be determined.

a. natural gas burning on a stove

b. isopropyl alcohol evaporating from skin

c. water condensing from skin

 

 

Step-by-step explanation

Step 1.

a.

The given process of burning natural gas on the stove releases heat from the system to the surroundings. Since this process involves the release of heat.

Therefore, it is exothermic with negative value.

b. 

The given process of evaporation of isopropyl alcohol absorbs heat from the surroundings. Since this process involves absorption of heat.

Therefore, it is endothermic with positive  value.

c. 

The given process of condensation of steam to form water releases heat from the system to the surroundings. Since this process involves the release of heat.

Therefore, it is exothermic with negative  value.

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