An excess of a solution of sodium bicarbonate containing 3.9 grams is added to a solution of silver nitrate containing 5.57 grams. When the reaction completes how many grams of silver nitrate are left?

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

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