How do you draw the lewis dot structure for cf2cl2?

C in the middle with 2x F and 2x Cl bound to it. Both F and Cl have 7 valence electrons. ( See photo)

Explanation:

Of the three ( C, F and Cl) carbon has the lowest electro negativity so we expect it to be in the middle.

C: 4e-  

F: 7e-  x 2 = 14e-

Cl: 7e-  x2 = 14e-

4+14+14 = 32 electrons : octet rule

CF2CL2 = Dichloro Difluoro Methane,

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

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