Which of the following illustrates a single replacement reaction? O A 2Fe +3872 → 2FeBrz
O B. Ba(NO3)2 + NISO4 → Baso, Ni(NO3)2
O C. CaCl2 + Na2CO3 → CaCo3 + 2NaCl
O D. Fe + CuSO4 → Cu + FeSO4
SUBMIT

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