Onsider the redox reaction below. Upper M g (s) plus Pper f e superscript 2 plus (a q) right arrow upper M g superscript 2 plus (a q) plus upper F e (s). Which equation is a half reaction that describes the reduction that is taking place? Upper F e superscript 2 plus (a q) plus 2 e superscript minus right arrow upper F e (s). Upper M g (s) right arrow upper M g superscript 2 plus (a q) plus 2 e superscript minus. Upper Fe superscript 2 plus (a q) right arrow upper F e (s) plus 2 e superscript minus. Upper M g (s) plus 2 e superscript minus right arrow upper Mg superscript 2 plus (a q).

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

the answer is c.the valence of the atoms combine .