Question

What is the change in enthalpy when 250 g of water vapor condenses at 100oC? (ΔHv = 40.67 kJ/mol)

Answer 1

Your answer is −565 kJ.

Answer 2

Answer:-564.4996 kJ is the change in enthalpy when 250 g of water vapor condenses at 100°C.

Step-by-step explanation:

`H_2O(l)\rightarrow H_2O(g),\Delta H_v=40.67 kJ/mol`

`[tex]H_2O(g)\rightarrow H_2O(l),\Delta H_c=-40.67 kJ/mol`

Moles of water =
`(250 g)/(18 g/mol)=13.88 mol`

Heat of condensation of 1 mol of water =
`\Delta H_v=-40.67 kJ/mol`

Heat change when 250 grams of water condenses at 100° C:

`-40.67 kJ/mol* 13.88 mol=-564.4996 kJ`

-564.4996 kJ is the change in enthalpy when 250 g of water vapor condenses at 100°C.