11. Can you identify an element using the following? (Put yes or no) A. Number of Protons =
B. Number of Neutrons =
C. Mass Number =
D. Atomic Number =

12. (Yes or No) are the following Isotopes?
A. C - 12 & C - 14
B. CI - 35 & Ca - 40
C. Fe - 56 & Fe - 56

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/XzW3SUN

Explanation:

11.)

A. yes

B. no

C. no

D. yes

12.)

A. yes

B. no

C. no

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

it is b that is the answer.