Use either raoult's law or henry's law to solve the following problems: i. a gas containing i mole% ethane is in contact with water at 20°c and 20 atm. estimate the mole fraction of dissolved ethane. 2. an equimolar liquid mixture of benzene (b) and toluene (t) is in equilibrium with its vapour at 30 °c. what is the system pressure and the composition of the vapour?

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 answers are

c and c