1. Modelaţi structura atomilor, repartizaţi electronii pe starturi, indicaţi grupa, perioada, procesul de ionizare şi caracterul chimic pentru elementele:
27
13 Al 31
15P 16
8O
39
19K
8O
39
19K

the answer is

is there any options? maybe im just not seeing them but i need the options to

-love shrooms

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