After creating a best fit line for your data, you choose the following two points on this line to calculate the equation of the line: (x, y):
Point 1: (219kPa, 0.250L).
Point 2: (321kPa, 0.160L).
Calculate the equation of the line using these points and include units and correct significant figures.
kPa is a unit of pressure. It does not need to be converted to any other unit.

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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