How many covalent bonds can each carbon atom form?

Lesson 1- 1.D 2.A 3.C 4.C 5.C

Lesson 2- 1.B 2. D 3. B 4. D 5.C

Lesson 3- 1.D 2.D 3.D

Lesson 5- 1.B 2.B 3.C

Lesson 6- 1.B 2.C 3.C 4.C

Lesson 7- 1.D 2.B 3.D 4.A 5.D

Lesson 8- 1.D 2.A 3.B 4.A

Uint 5 Lessons 1-8

100% correct

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

answerambulatory;