Give the name or formula. For parts 1 and 2, enter your answer as all lower case with appropriate spacing. For parts 3 and 4 use capital letters where appropriate but don't worry about sub or superscripting. What is the systematic name of Na3[AlF6]? What is the systematic name of [Co(en)2Cl2]NO3? What is the formula of (IV) chloride? What is the formula of hexaamminecobalt(III) tetrachloroferrate(III)?

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