Question

Take-home Practice Problems as part 1. 8.50 moles of thelium gas occuplesavome of 25 OL the gas? 20", whe 2. How many grams of carbon dioxide are in a container of the pressure is volume is 2.25L at 29"C? in a container if the pressure is 335 torr and the 3. What volume does 11.9g of ammonia (NH) occupy at STP? 4. What volume does 23.0g of chlorine gas occupy at 45°C and 665 tor? 5. How many gas molecules are present in a 600.0mL container of N20 at 45 °C and 400.0 torr? 169

Answer 1

To find the pressure of the gas Use the ideal gas law : PV = nRT p= pressure n=n moles of any gas R = gas constant T = temperature V = volume p = ? n = 8.50mol R = 0.0821 L atm/mol.K T = 28+273 = 301K V = 25.0 L P=nRT V 8.50m ol 0.0821L - atm/mol KX301K 25.0L P = 8.40 atm Hence the pressure of the gas = 8.40 atm

(2) To find the mass of the carbon dioxide (CO2) First find the moles of the CO, Use theideal gas law: PV = nRT p= pressure n=n moles of any gas R=gas constant T = temperature in kelvin v= volume p = 335 torr Convert pressure torr to atm 1 atm = 335torr 1 am 335 torr = 335tort 760 torr -= 0.440 atın n = ? R = 0.0821L.atm/mol.K T = 29+273K = 302K V = 2.25L PV MERT 0.440 atm x 2.25L 0.0821L atm/mol. KX 302K n = 0.0400 moles To find the mass of the Co, gas mass = moles x molarm ass molarmass of the CO, = 44.01g/mol mass = 0.0400mol X 44.01g/mol = 1.76g Hence the mass of the CO, = 1.768