If 1.2 moles of CuCl are mixed with
excess of H2S gas, how many moles of Cu2S would be made?

Moles of CuS : 1.2

Further explanation

The reaction coefficient in a chemical equation shows the mole ratio of the components of the reactants and products

If one mole of the reactant or product is known, then we can determine the moles of the other compounds involved in the reaction

Reaction

CuCl₂ (aq) + H₂S (g) → CuS (s) + 2HCl (aq)

CuCl are mixed with  excess of H₂S gas, so CuCl as a limiting reactant

mol ratio of CuCl₂ : mol CuS = 1 : 1, so mol CuS :

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.