A NASA satellite showed that in 2012 the ozone hole over Antarctica had a maximum surface of 21.9 million km^2. The largest ozone hole on record occurred in 2006 and had a surface area of 29.2 million km^2. Calculate the difference in diameter (in meters) between the ozone hole in 2012 and in 2006. (Assume ozone holes are circles).

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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

the answer is 0.42 is that is an option. this question provides no info