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How to find starting miles of an equilibrium? ?

Kp= P (so2)2 Po2 / P(so3)2


At a particular temperate, 75% of sulphur trioxide is dissociated, producibg a pressure of 10atm. Calculate the kp at this temperature.

I have looked at the answers and i dont get it.??

2So3=0.5
2So2=1.5
02= 0.75 (why is this 75 when it saids the sulphur trioxide??)
Reply 1
Imagine you start with 1 mol of SO3 and 75% of it dissociates...

How many mol of SO3 remain?
What forms when SO3 dissociates?
How many mol of products form?
What is the mole fraction of each chemical present at equilibrium?
What are the partial pressures of each?
What is the value of Kp?

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