Answer: The corresponding value of
for this reaction at 84.5°C is 0.00232
Explanation:

Relation of with is given by the formula:

where,
= equilibrium constant in terms of partial pressure = ?
= equilibrium constant in terms of concentration = 0.0680
R = Gas constant = 
T = temperature =
= change in number of moles of gas particles = 
Putting values in above equation, we get:

Thus the corresponding value of
for this reaction at 84.5°C is 0.00232
It is called a ionic bond or a electrovalent bond. Hope it helps :)
Answer:
=71.439911 u
Explanation:
We know that 1 mass of hydrogen atom = 1.00784 u
If it's measured at 72u: 72/1.00784=71.439911 u