What are the Coefficients in the balance equation below? 1 H2SO4 + 2 NaNO2 --->2 HNO2 + 1 Na2SO4
A. 10:10
B. 6:4:4:6
C.2:4:2:2:2:4
D. 1:2:2:1

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