Hydrogen gas is allowed to permeate through a thin plastic membrane that is 83 microns thick. concentrations of 0.025 moles/m3 and 0.0025 moles/m3 are maintained on the high and low pressure sides of the membrane, respectively. if the diffusivity of hydrogen gas molecules in the plastic is 4.2x10-8 m2/s, how many moles of hydrogen gas pass through a 6.0 square meter area of the plastic membrane every hour ? hint: we are really computing a flow rate here, rather than a flux. a flow rate is equal to a flux multiplied by an area, and its units are generally count / time.

c. is the answer

by love gaming

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol