Given
Initial volume = 1.1 L (V1)
Initial molarity = 2.50 M (M1)
Final volume = 6.0 L (V2)
I think so you require the final molarity (M2) as that is missing
We know that
M1V1 = M2V2
2.5 M * 1.1 L = M2 * 6.0 L
M2 = 2.5 M * 1.1 L / 6.0 L = 0.46 M
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