At a certain altitude a barometer using water (density 0.99g0cm³) as the barometric liquid gave a pressure that was recorded as 85cm H2O. if be a we density 0.879g/cm³ was used in the barometer calculate the height of the barometer under the same condition?

At a certain altitude a barometer using water (density 0.99g0cm³) as the barometric liquid gave a pressure that was recorded as 85cm H2O. if be a we density 0.879g/cm³ was used

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