5.35 7th edition

[Andie Jian 1D]

In this question, it gives you a plot of partial pressures of reactants and products. From the graph (attached below), you obtain the balanced equation 2A(g) --> B(g) +2C(g). My first question is why this balanced equation doesn't have an equilibrium symbol, and if it would be considered wrong if we did write it with an equilibrium sign.

In Part B of this question, you need to calculate K, but they take all of the values given by the graph and divide them by 100. For example, the partial pressure of B isn't just 5, but rather 5/100. Can someone please explain to me why they did this? It seems like a unit conversion, so are there specific units we are supposed to put all our terms in?

[Hovik Mike Mkryan 2I]

Hello,
I also had this same question and how the balanced equation was derived.