Will a balloon filled with the given gas rise in the air or drop to the ground?

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Will a balloon filled with the given gas rise in the air or drop to the ground? (Assume the mass of the balloon is negligible and the density of air is 1.29 g/L.) 

(a) Laughing gas (d = 1.96 g/L) 

(b) Ammonia (d = 0.759 g/L).

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