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A diver at the bottom of a lake, where the pressure is 6.0 atmospheres and the water temperature is 4.0 C, observes a bubble of a gas travel up to the surface of the lake. For this lake, at the surface the pressure is 1.0 atmosphere and the water temperature is 25.0 C. Assume the bubble behaves as an ideal gas. (a) Calculate the ratio of the volume of the bubble at the surface to that at the bottom of thelake. Give your answer by entering a number, specified to an appropriate number of significant figures, in the empty box below. volume at the surface 3 volume at the bottom Vb (b) The bubble, which can be assumed to be approximately spherical, is 0.75 mm in radius at the bottom of the lake. Calculate the number of molecules of gas in the bubble. Give your answer in scientific notation and specified to an appropriate number of significant figures, in the empty box below. x2 number of molecules =