Question

7.02

CaO(s) + H2O(l) → Ca(OH)2(s): ΔH = −65.2 kJ

Which statement about the reaction between calcium oxide and water is correct?

65.2 kJ of heat are released for every mole of CaO that reacts.
130 kJ of heat are released for every mole of H2O that reacts.
130 kJ of heat are absorbed for every mole of CaO that reacts.
65.2 kJ of heat are absorbed for every mole of H2O that reacts.

Answer 1

65.2 kJ of heat is released for every one mole of calcium monoxide which reacts is the correct statement for the given reaction.

Step-by-step explanation:

Took the quiz

Answer 2

According to given chemical reaction, one mole of carbon monoxide reacts with one mole of water results in the formation of one mole of calcium hydroxide.

Therefore, calcium monoxide and water reacts in one ratio one (1:1).

Now, in given chemical reaction, change in enthalpy is negative i.e. -65.2 kJ (less than zero).

The negative sign of change is enthalpy indicates that heat is released and the reaction in which heat is released is said to be exothermic reaction. Thus, the given reaction is exothermic i.e. heat is released.

Hence, 65.2 kJ of heat is released for every one mole of calcium monoxide which reacts is the correct statement for the given reaction.