Question

1a.zone molecules in the stratosphere absorb much of the harmful radiation from the sun. How many ozone molecules are present in 5.00 L of air under the stratospheric ozone conditions of 233 K temperature and 1.23 × 10−3 atm pressure?

answer: ______x10^----

1b. Calculate the density of helium in a helium balloon at 21.9°C. (Assume that the pressure inside the balloon is 1.05 atm.)

Answer 1

Solution : (a) Given volume of ozone = 5.00L pressure = 1.23x10-34im Temperature = 233k Applying Ideal ças Equation (R=0.0821) PV=nRT 91-23X10-3x5= 77X0.8 21 X 233 m= 0.321 X10-3 moles 1 We know, I mole = 6.022X1023 molecules Total ozone mokcules - = moles X 6.022 X 1023 moles 20.321 X6-022 X 1023x10-3 molecule = 1.94 X 1020 molecules pressure inside balloon =1.05 atm Temperglwee = 21.9°C =(273 +21.9°K) = 294.94 Applying ideal gas Equalmon. - PV=nRT TPV a mass RI molar wars n= mass molar mais a PMo = mass RT volume da PMO s mass ( nolume adeusch RT = 0-1734 g/L de 1.05X4 0.0821 x 294.9

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