The equilibrium constant for the reaction A(g) <-> B(g) is 0.1. A reaction mixture initially contains [A] = 1.1 M and [B] = 0.0 M. Which statement is true at equilibrium?

you did not give any options thus this is the best answer i can give to you with this little information you have given

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8