Process Calculations GATE-1992
Fill in the blanks (Questions 1 & 2):
Q 1: It is desired to make 100 kg of a solution containing 40 % salt by mixing solution A containing 25 % salt and solution B containing 50 % salt. The mass in kg of solution A required is ___________.
Q 2: 1.2 g atoms of carbon and 1.5 g moles of oxygen are reacted to give 1 g mole of carbon dioxide. The limiting reactant is _________. The percent excess reactant supplied is __________.
Q 3: A multiple-effect evaporator has the capacity to process 4000 kg of solid caustic soda per day when it is concentrating Iron. 10% to 25% solids. The water evaporated in kg per day is
Q 4: The concentration of SO2 in the flue gases from a boiler was found to be 0.2 kg/m3 at N.T.P. Determine the concentration of SO2 in parts per million by volume, at N.T.P. Assume that the gases are perfect.
Q 5: The analysis of the gas entering the secondary converter in a contact sulphuric acid plant is 4 % SO2, 13 % O2, and 83 % N2, (volume %). In the converter, SO2 is oxidized to SO3. The gases leaving the converter contain 0.45 % SO2 on an SO3-free basis (volume %). Calculate the percent conversion of SO2.
Q 6: Dry methane is burned with dry air. Both are at 25° C initially. The flame temperature is 1300° C. If complete combustion is assumed how much excess air is being used? The reaction is given below.
CH_4+2O_2\rightarrow CO_2+2H_2OThe standard heat of reaction = –8.028×105 J/g mole of CH4 reacted. Mean molal specific heats of gases between 25° C and 1300° C in J/(g.mole)(°K) are given below:
| CO2 | H2O | O2 | N2 |
|---|---|---|---|
| 51.88 | 40.45 | 34.01 | 32.21 |