The mass of water needed to fill a flask (different than the flask discussed in the previous question) is 186.88 g. The density of water at various temperatures is listed in Appendix E of your laboratory manual. If the temperature is 24.

the answer is barium and copper bromide

it is b that is the answer.

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

answerca air mass;