The lab procedure you just studied involves
several factors, listed below. Some are variable
and some are constant. Label each factor below V
for variable or C for constant.
initial number of radioactive nuclei
number of half-life cycles (time)
half-life of Lincolnium
number of protons in Lincolnium and
Memorium
number (or fraction) of Lincolnium atoms
DONE
Intro

yes definetly because you are using energy

not clear

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