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You can either go for a 1 ton AC or a 1.5 ton AC depending upon the amount of light that enters the room, area and direction of windows, the floor on which your room is situated, number of people occupying the room and the number of lights.
Most air-conditioners generate about 400 CFM per ton, but don't confuse Square Feet with Cubic Feet. A sunny South-facing room will take more CFM to cool than the same size room facing North. The answer you don't want to hear, but is most accurate, is that it depends.