Compare the rates of effusion of nh3 and o2

Answer : The rate of effusion of ammonia gas is 1.37 times of rate of effusion of oxygen gas.

Solution :

According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.

or,

where,

= rate of effusion of ammonia gas

= rate of effusion of oxygen gas

= molar mass of ammonia gas  = 17 g/mole

= molar mass of oxygen gas  = 32 g/mole

Now put all the given values in the above formula, we get :

Therefore, from this we conclude that, the rate of effusion of ammonia gas is 1.37 times of rate of effusion of oxygen gas.

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

it is reliable if two scientists recorded it