7. an unknown metal was reacted with 20 ml of 2.0 m hcl to produce hydrogen gas that was
collected over water. assume that no air was present initially in the container used to collect the
hydrogen. using the data provided in option_ g determine the formula of the metal
chloride that is formed. show all of your work. (hint: consider the significance of
coefficients in a balanced equation. start by writing an unbalanced equation using m to
represent the metal and mci, to represent the metal chloride. then use the data given to
determine the ratio of moles of metal to moles of hydrogen and complete the balanced equation.)

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