Asolution of hno3 is standardized by reaction with pure sodium carbonate2h+ + na2co3 -> 2na+ + h2o + co2a volume of 24.42 +or- 0.06ml of hno3 was required for complete reaction with 0.9858+or- 0.0008g of na2co3 (fm 105.988+or- 0.001). find th molaritynof the hno3 and its absolute uncertaintyhno3= +or-

idk what is it? is this a question that you know the answer or u dont

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

c. 4.54 x 10–12 j happens to be correct