NaOH+H 2 CO 3 Na 2 CO 3 +H 2 O -Balance the chemical equation
-What is the mole ratio between sodium carbonate and carbonic acid?
-Find the mass of water when 3.5 moles of NaOH react
-Find the number of moles of produced when 5.7x1023 formula units of NaOH react

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

answerto predict;