In a balanced chemical equation, the total mass of the reactants is equal to the total mass of the products. true or falso

3 1/4 %

explanation:

the answer is 303.15 or 303

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

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