What mass of lead (II) chloride would be produced when a solution containing 23.4g of sodium chloride is mixed with a solution containing excess lead (II) nitrate? The equation for this reaction is: Pb(NO3) 2(aq) +2NaCl(aq)-->PbCl2(s) +2NaNO3(aq).

the maximum mass of nh3 is nh3 in grams

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