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Question

The equation M+(x+y)NH3-->[M(NH3)x]++[e(NH3)y]- in this equation M is a alkali metal what is the meaning of x and y in the equation. I

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Solution

Here the x, y are meaning that there are total of x+y molecules of ammonia out of which x molecules are associating with metal to form the compound.
M + x NH3 --> [M(NH3)x]^+
and the rest y molecules of ammonia is combining with electrons released by sodium to form ammoniated electrons
yNH3 +e --> [e(NH3)y]^-
This are approximate values for ammonia combining with metal and electron because there is no fixed ratio in this reaction.

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