2 NaHCO3(s) ⇔ Na2CO3 (s) + H2O(g) + CO2(g) enthalpy = +128 kJ is at equilibrium. What happens to [CO2] when the H2O is added?

The question is incomplete; the complete quqestion is ;

iv. What happens to [CO2] when the H2O is added?

a. increased

b. decreased

c. no change

decreased

Explanation:

Recall that the reaction shown in the question is endothermic (positive change in enthalpy).

When water is added to the system, carbonic acid is formed  as follows;

CO2(g) + H2O(l) ---> H2CO3(aq)

This reaction is decreases the concentration of the carbon IV oxide as it dissolves in the water.

any far is the region can control the climate

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.