The gabriel amine synthesis is a method for preparing a primary amine from an alkyl halide. the reaction involves the alkylation of phthalimide. in phthalimide, the n-h hydrogen is acidic due to the two flanking carbonyl groups. thus, phthalimide can be deprotonated by a strong base. the resulting anion is a strong nucleophile and readily displaces halide in an sn2 reaction, leading to an n-alkylated imide. the imide is then hydrolyzed in aqueous base to yield the primary amine and phthalate. draw curved arrows to show the movement of electrons in this step of the mechanism

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