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Initially, there are 33 moles of A and 0 moles of B. How many moles of A and B will be present after the system reaches equilibrium?

a) 33 moles A; 0 moles B
b) 0 moles A; 33 moles B
c) 3 moles A; 30 moles B
d) equal amounts of A and B

The answer is given as "C" but I don't know how it was obtained :/

  • chemistry -

    No K? no reaction?

  • chemistry -

    Oops, here it is.

    refer to the following equilibrium below:
    A <===> B Keq = 10

  • chemistry -

    oops, wrong thread. but i have the same question regardless.

  • chemistry -

    These problems can be tough enough when we have enough information but omitting it makes it really tough. :-).

    ..............A ===> B

    K = 10 = (B)/(A)
    10 = (x)/(33-x)
    Solve for x and 33-x.
    I get x = 30 = B and 33-x = 3 = A.

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