How do you determine whether an acid should be broken up into ions in the complete ionic equation?

What is the mass of 0.46 mil of mgcl2

The reaction below shows a system in equilibrium. how would a decrease in temperature affect this reaction? a. the rate of formation of the gases would increase. b. the equilibrium of the reaction would shift to the left. c. the equilibrium would shift to cause the gases to sublime into solids. d. the chemicals on the left would quickly form the chemical on the right.

How many moles are in 1.26*10^24 particles in significant figures