IIT FOUNDATION
IX-Ass- 4
---------------------------------------------------------
1) An evacuated glass vessel weights 50.0kg when empty, 148.0g when filled with a liquid of density 0.98g ml-1 and 50.5gm filled with an ideal gas at 760mm Hg at 300k. Determine the molecular weight of the gas. (I.I.T 1998) [123.15g mol-1]
2) A spherical balloon of 21cm diameter is to be filled with hydrogen at NTP from a cylinder containing the gas 20 atmosphere at 27oC. If the cylinder can hold 2.82 liters of water, calculate the number of balloons that can be filled up.(I.I.T.1987)[10]
3) Calculate how many methane molecules and how many hydrogen and carbon atoms are there in 25.0g of methane? [37.644x1023]
4) Calculate the total number of electron in 18ml of water. [6.023x1024]
5) Calculate the total number of electrons in (A) 1.6g of C2H6 and (b) in –CONH2 group.[6.023x1023 electrons]
6) A plant virus is found to consist of uniform cylindrical particles of 150 Ao in diameter and 5000Ao long. The specific volume of the virus is 0.75 cm3/g. if the virus is considered to be a simple particle, find its molecular weight. (I.I.T.1999) [70.9x106 g/mole]
7) Find (I) the total number of neutrons and (ii) the total mass of neutrons in 7mg of 14C (Assume that the mass of a neutron = mass of a hydrogen atom) [(i) 24.08x1020(ii)4mg]
8) From 200mg of CO2, 1021 molecules are removed. How many moles of CO2 are left? [2.88x10-3 mole]
9) Oxygen is present in a liter flask at a pressure of 7.6X10-10mm of Hg. Calculate the number of oxygen molecules in the flask at 0oC. [2.7x1010 molecules]
10) Calculate the volume occupied by 5.0g of acetylene gas at 50oC and 740mm pressure. (I.I.T.1991) [5.23lit]
11) An open vessel at 30oC is heated until 215 of the air in it has been expelled. Assuming that the volume of the vessel remains constant, find the temperature to which the vessel has been heated? [ ]
12) Calculate the volume occupied by 10gm of oxygen gas at 27oC and 750mm pressure. [ ]
13) Calculate the temperature of 4moles of a gas occupying a volume of 5.0lit at 2.46 atmosphere. [ ]
14) Calculate the density of CH4 at 30oC and 5 atm pressure. [ ]