AS CIE chem question
9 Two moles of compound P were placed in a vessel. The compound P was partly decomposed byheating. A dynamic equilibrium between chemicals P, Q and R was established.At equilibrium, x mol of R were present and the total number of moles present was (2 + x).What is the equation for this equilibrium?
A P <---->2Q + R
B 2P <---->2Q + R
C 2P <---->Q + R
D 2P <---->Q + 2R
Answer is B, why?
A P <---->2Q + R
B 2P <---->2Q + R
C 2P <---->Q + R
D 2P <---->Q + 2R
Answer is B, why?
Original post by Deathlotus
9 Two moles of compound P were placed in a vessel. The compound P was partly decomposed byheating. A dynamic equilibrium between chemicals P, Q and R was established.At equilibrium, x mol of R were present and the total number of moles present was (2 + x).What is the equation for this equilibrium?
A P <---->2Q + R
B 2P <---->2Q + R
C 2P <---->Q + R
D 2P <---->Q + 2R
Answer is B, why?
A P <---->2Q + R
B 2P <---->2Q + R
C 2P <---->Q + R
D 2P <---->Q + 2R
Answer is B, why?
as per option B:
moles of P = ( 2 - x/2 )
moles of Q =( x/2 )
moles of R =( x )
Then
total moles = 2 + x
got it?
thank you, so this is a trial and error question?
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