Raphaela wants to enter the school science fair and has a list of ideas for a project. Which questions could she
answer through scientific investigation? Check all that apply.
Are elephants afraid of mice?
Does feeding peanuts to a chicken make it produce larger eggs?
Do the chirps of a cricket indicate air temperature?
Why are small dogs more cuddly than large dogs?
Do plants go taller when there are earthworms in the soil?

Does feeding peanuts to a chicken make it produce larger eggs?

Do the chirps of a cricket indicate air temperature

Do plants go taller when there are earthworms in the soil  

I'm taking the assignment now

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