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The question showed a graph of the decomposition of compound A into compounds B and C that reach equilibrium. The partial pressure is on the y-axis, in kPa. A changed from a partial pressure of 28 to 18, B from 0 to 5, and C from 0 to 10. Part (a) asked to write the balanced chemical equation for the reaction, but the part in question is part(b), where it asks to calculate K for the reaction. I was initially confused why the pressures had to be divided by 100, but I think it's because the value of Kp depends on the units of pressure. The textbook calculates Kp using atm or bar (1atm ~ 1bar). Since the pressure was given in kPa, you had to convert kPa to atm, and 1kPa ~ 0.01 atm, which is why you had to divide by 100. I'm not sure if we'll be given conversion factors like that on the test though, I had to look it up myself.
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