What do you mean by material balance equation?

Original-Solids-in-place (OSIP)

Original-Liquid-in-place (OLIP)

If air consists of 77% by weight of nitrogen and 23% by weight of oxygen calculate:

the concentration of oxygen in mole/m3 and kg/m3 if the total pressure is 1.5 atmospheres and the temperature is 25 degreeC.

the mean molecular weight of air,

the concentration of oxygen in mole/m3 and kg/m3 if the total pressure is 1.5 atmospheres and the temperature is 25 degreeC.

1.	What do you mean by material balance equation?
A.	Original-Solids-in-place (OSIP)
B.	Original-Gas-in-place (OGIP)
C.	Original-Air-in-place (OAIP)
D.	Original-Liquid-in-place (OLIP)
Answer» E.

3.	When pure carbon is burned in air, some of it oxidizes into CO2 and some to CO. The molar ratio of N2 to O2 is 7.18 and the ratio of CO to CO2 is 2.0 in the product gas. What is the percent excess air used? The exit gases contain only N2, O2, CO and CO2.
A.	50 %
B.	60 %
C.	40 %
D.	20 %
Answer» D. 20 %

4.	What is the fractional and percent excess of H2 from the following equation?H2 + Br2 = 2HBrH2 = 25 mol/hrBr2 = 20 mol/hr
A.	0.45, 45%
B.	0.25, 25%
C.	0.75, 75%
D.	0.65, 65%
Answer» C. 0.75, 75%

5.	The reaction between ethylene and hydrogen bromide to form ethyl bromide is carried out in a continuous reactor.C2H4 + HBr = C2H5BrThe product stream is analyzed and found to contain 51.7 mole% C2H5Br and 17.3% HBr. The feed to the reactor contains only ethylene and hydrogen bromide.Calculate the fractional conversion of the limiting reactant and the percentage by which the other reactant is in excess. If the molar flow rate of the feed stream is 165 mol/s, what is the extent of reaction?
A.	56.2 mol/s
B.	45.6 mol/s
C.	55.6 mol/s
D.	44.6 mol/s
Answer» B. 45.6 mol/s

6.	In the carbonation of a soft drink, the total quantity of carbon dioxide required is the equivalent of 3 volumes of gas to one volume of water at 0⁰C and atmospheric pressure. Calculate (i) the mass fraction and (ii) the mole fraction of the CO2 in the drink, ignoring all components other than CO2 and water.Basis 1 m3 of water = 1000 kgVolume of carbon dioxide added = 3 m3From the gas equation, pV = nRT1 x 3 = n x 0.08206 x 273 n = 0.134 mole.Molecular weight of carbon dioxide = 44And so weight of carbon dioxide added = 0.134 x 44 = 5.9 kg
A.	6.9 × 10-3, 3.41 × 10-3
B.	8.9 × 10-3, 2.41 × 10-3
C.	5.9 × 10-3, 2.41 × 10-3
D.	9.9 × 10-3, 3.41 × 10-3
Answer» D. 9.9 × 10-3, 3.41 × 10-3

7.	If air consists of 77% by weight of nitrogen and 23% by weight of oxygen calculate:(i) the mean molecular weight of air,(ii) the mole fraction of oxygen,(iii) the concentration of oxygen in mole/m3 and kg/m3 if the total pressure is 1.5 atmospheres and the temperature is 25 °C.
A.	29.8, 0.21, 0.010 mole/m3
B.	28.8, 0.21, 0.013 mole/m3
C.	27.6, 0.30, 0.010 mole/m3
D.	29.8, 0.30, 0.013 mole/m3
Answer» C. 27.6, 0.30, 0.010 mole/m3

8.	A process unit involves 3 chemical components. How many mass balances can be written?
A.	3
B.	5
C.	6
D.	4
Answer» E.

9.	According to the Balances on steady-state processes, the accumulation is equal to?
A.	1
B.	0
C.	100
D.	2
Answer» C. 100

10.	Each year 80,000 people move into a city, 70,000 people move out, 18,000 are born, and 11,000 die. Write a balance on the population of the city.
A.	17,000 P/yr
B.	15,000 P/yr
C.	20,000 P/yr
D.	22,000 P/yr
Answer» B. 15,000 P/yr

11.	If air consists of 77% by weight of nitrogen and 23% by weight of oxygen calculate:
A.	the mean molecular weight of air,
B.	the mole fraction of oxygen,
C.	the concentration of oxygen in mole/m<sup>3</sup> and kg/m<sup>3</sup> if the total pressure is 1.5 atmospheres and the temperature is 25 degreeC.
D.	29.8, 0.21, 0.010 mole/m<sup>3</sup>
Answer» C. the concentration of oxygen in mole/m<sup>3</sup> and kg/m<sup>3</sup> if the total pressure is 1.5 atmospheres and the temperature is 25 degreeC.