Process Calculations GATE-1991
Fill in the blanks (Questions 1, 2, 3 & 4):
Q 1: A wet paper pulp contains 75 % water. After 100 kg of water is removed in a dryer, it is found that the pulp is now containing 30 % water. The weight of the original pulp is ________________
Q 2: The weather bureau reports a dry bulb temperature of ambient air as 29° C and relative humidity of 80 %. The barometer reads 750 mm Hg. The percentage humidity of the ambient air is _________. (Vapour pressure of water at 29° C = 30 mm Hg)
Q 3: H2S is produced from the reaction FeS+2HCl\rightarrow FeCl_2+H_2S . 120 kg of FeS react with 150 kg of HCl and 0.5 kmol of H2S has been produced. The degree of completion of the reaction is _________ and the limiting reactant is ________.
Q 4: The heat absorbed for isothermal reaction
C_4H_{10}(g)\rightarrow C_2H_4(g)+C_2H_6(g)at 298 K and 1 atm pressure is __________. The standard heat of combustion in kJ/mol is given below:
| C2H10(g) | C2H4(g) | C2H6(g) |
|---|---|---|
| -2873.5 | -1411.9 | -1561.0 |
Q 5: Limestone mixed with coke is being burnt in a kiln. An average analysis of the limestone is CaCO3: 84.5 %, MgCO3: 11.5 % and the rest inerts. The coke contains 76 % carbon, 21 % ash, and 3 % moisture. The calcinations of CaCO3 is only 95 % complete and that of MgCO3 90 %. The carbon in the coke is completely burnt to CO2. The kiln is fed with 1 kg of coke per 5 kg limestone. Calculate the weight percent CaO in the product leaving the kiln.
Q 6: Nitrogen from a cylinder is bubbled through acetone at 1.1 bar and 323 K at the rate of 2×10-4 m3/min. The nitrogen, saturated with acetone vapor, leaves at 1.013 bar, 308K at the rate of 3.83×10-4 m3/min. What is the vapor pressure of acetone at 308 K?