Ineed
drag each number to the correct location on the equation. each number can be used more than once, but not all numbers will be used.
balance the equation with the correct coefficients.
2
3
4
5

Explanation:

When a chemical equation has equal number of atoms on both reactant and product side then it is known as a balanced equation.

For example,

Number of atoms on reactant side are as follows.

K = 1

Cl = 1

O = 3

Number of atoms on product side are as follows.

K = 1

Cl = 1

O = 2

Hence, to balance this equation we multiply by 2 on the reactant side and multiply KCl by 2 and by 3 on the product side.

Therefore, the balanced chemical equation is as follows.

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