Answer:
![Ka=\frac{[H^+][HCOO^-]}{[HCOOH]}](https://tex.z-dn.net/?f=Ka%3D%5Cfrac%7B%5BH%5E%2B%5D%5BHCOO%5E-%5D%7D%7B%5BHCOOH%5D%7D)
Explanation:
Hello,
In this case, the weak ionization reaction for formic acid is:

In such a way, we simply recall the law of mass action in order to represent the weak ionization constant, Ka, for such process, by taking into account that the concentration of products is divided over the concentration of reactants as shown below:
![Ka=\frac{[H^+][HCOO^-]}{[HCOOH]}](https://tex.z-dn.net/?f=Ka%3D%5Cfrac%7B%5BH%5E%2B%5D%5BHCOO%5E-%5D%7D%7B%5BHCOOH%5D%7D)
Best regards.
In the balanced reaction shown, there are twice as many moles of water as oxygen. If 13.35 moles of oxygen are reacted, 26.70 moles of water is formed
It would be 10 seconds at the most
Frequency= 1/period
hence ans= 1/0.25
= 4s
Hey there!
Ninety nine percent of the atmosphere is composed of oxygen and nitrogen! The atmosphere is composed of 78% nitrogen and 21% oxygen!
Hope it helps :D