Question

1. A balloon is partially inflated with 5.00 L of helium at sea level, where the atmospheric pressure is 1.00 atm. The balloon ascends to an altitude of 1600 m, where the pressure is 0.83 atm. What is the volume of the balloon at the higher altitude, if the temperature of the helium does not change? 2. What Celsius temperature is required to increase the volume of.a sealed balloon from 2.00 L to 3.00 L if the initial temperature is 15°C and the atmospheric pressure is constant? 3. What is the volume of 1 mole of gas at STP? 4. At what temperature will 2.20 mole of an ideal gas in a 3.40 L container exert a pressure of 0.75 atm? 1.00 atm? 2.00 atm? 5. The density of methane gas is measured at four sets of conditions. Under which set of conditions is the density of CH, the greatest? (a) T=300K, P= 1 atm; (b) T= 325K, P= 1 atm; (c) T = 275K, P=2 atm; (d) T= 300K, P = 2 atm. 6. How many grams of sodium azide are needed to produce 50.0L of N, according to the following equation at STP? 2 NaN,(s) 2 Na(s) + 3 N. (9)

Answer 1

(Tin are constant) Using P, V, = P₂ V2 1x5= 0.83XV2 V₂ = 6.024L V=2L N2 = 32 Ti=ISC T = ? =15+273 = 288K using DVI = V₂ - Ti Tv t = 38 288 = 432k g =159°C 3 Imole = 22.4L STP, T=273K at STP. P=latm v=rRT 1X0-08210273 = 22.4L