Find the concentration of Htions at a pH = 11 and pH = 6. Then divide the concentration of Htions at a
pH = 11 by the of H+ ions at a pH = 6. Record your
answer in Table C.
What is the concentration of H+ ions at a pH = 11?
mol/L
What is the concentration of H+ ions at a pH = 6?
mol/L
How many fewer H+ ions are there in a solution at a
pH = 11 than in a solution at a pH = 6?

6.4 cm (max) - 25 cm (min)

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

diaria maybe go see a doctor about that