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Capt. Jack Sparrow
Subject: Chemistry
, asked on 15/10/17
what is pressure and volume at ntp
Answer
1
Soumyadeep Kar
Subject: Chemistry
, asked on 12/10/17
Ans: 64*10^(-4) ltr/hr
Q.15 The respiration of the suspension of yeast cells was measured by observing the decrease in pressure of gas above the cell suspension. The apparatus show that the gas was confined to a constant volume, 16 ml and the entire pressure change
was caused by uptake of O
2
by the cells. The pressure was measured in a manometer, the fluid of which had a density of I .034 gm/ml. The entire apparatus was immersed in a thermostat at 37°C. In a 30 min. observation period the fluid in open side of manometer dropped 37 mm. neglecting the solubility of O
2
in yeast suspension, compute rate of O
2
consumed by the cells in It of O
2
(S.T.P.) per hour.
Answer
1
Soumyadeep Kar
Subject: Chemistry
, asked on 12/10/17
Solve this:
Q16. Find the critical constant (P
c
,V
c
and T
c
) in terms of A and B, also find compressibility factor (z) for the following equation of state. PV = RT–
A
V
+
2
B
V
2
where A and B are constant, P = pressure and V = molar volume.
Answer
1
Soumyadeep Kar
Subject: Chemistry
, asked on 12/10/17
Solve this:
Q. A mixture of C
5
H
8
and H
2
gas was placed in a container at a constant temperature. Initial volume of mixture was 10 ml. Sparking the mixture caused hydrogenation reaction
C
5
H
8
(g) + 2H
2
(g)
→
C
5
H
12
(g)
Due to above reaction (on cooling) volume decreases by 6 ml. Excess of O
2
was then added and on sparking the volume further decreased by 15 ml. Calculate
(i) Volume of each gas in original mixture.
(iii Mole fraction of C
5
H
8
in original mixture.
Answer
1
Sandhya Karthik
Subject: Chemistry
, asked on 12/10/17
on burning 20 g of h2 in excesso2 at 298k 2860kj of heat is roduced write value of enthalpy of combustion of co2
Answer
1
Sandhya Karthik
Subject: Chemistry
, asked on 12/10/17
standard enthalpy of combustion of ch3oh producing co2 and h2o is -726.1 if latent heat of fusion aof co2 and h20 is -393kj and -286kj calculate latent heat of fusion of ch3oh
Answer
1
Sandhya Karthik
Subject: Chemistry
, asked on 12/10/17
enthalpy of combustion of methane is -890.3kj calculate mass of methane reqto produce 455.15kj of heat and amt of heat fr burning 8 kg of methane
Answer
1
Subhashree
Subject: Chemistry
, asked on 11/10/17
A gas of oxygen and nitrogen contains 44.8g of oxygen and 72.8g of nitrogen . The pressure of the mixture is 500 pa . What are the partial pressure of oxygen and nitrogen in the mixture
Answer
1
Arpita Dua
Subject: Chemistry
, asked on 5/10/17
if 300 ml of gas weigh 0.368g at Stp , what is its molecular weight?
Answer
3
Sandhya Karthik
Subject: Chemistry
, asked on 5/10/17
calculate w q and delta u for 0.75 mol of ideal gas expands isothermally and reversibly at 300k from 18 l to 30 l
Answer
1
Sandhya Karthik
Subject: Chemistry
, asked on 5/10/17
A gas absorbs 125 j of heat and expands against the external pressure of 1.2 atm from a volumeof 0.5 l to 1.0 l what is the change in internal energy
Answer
1
Noel George Cherian
Subject: Chemistry
, asked on 4/10/17
A spherical weather balloon is constructed so that the gas inside can expand as the balloon ascends to higher altitudes where the pressure is lower. If the radius of the spherical balloon is 3m at sea level where the pressure is 1.0 x 105 Pa, what will be the radius at an altitude of about 10 km where the pressure of the gas is 2.16 x 104 Pa? For simplicity, assume the temperature has not changed.
Answer
1
Noel George Cherian
Subject: Chemistry
, asked on 4/10/17
7. At room temperature, volume of gas enclosed in a cylinder at 1atm pressure, is 10L. What will be the volume of gas at 20atm pressure? Compare the density of above gas at two different pressures .
Answer
3
Tulsi Mehta
Subject: Chemistry
, asked on 3/10/17
lewis structure of AlCl3
Answer
2
Sarvesh Kumar
Subject: Chemistry
, asked on 3/10/17
??????
Q. What is the density of moist air with 90 % relative humidity under the condition of 1 atm pressure and 21
°
C. The vapor pressure of water at 25
°
C is 23.7 torr and dry air has 76 %
N
2
and 24 %
O
2
. find the difference in the density of dry air and moist air at the given condition.
Answer
1
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Q.15 The respiration of the suspension of yeast cells was measured by observing the decrease in pressure of gas above the cell suspension. The apparatus show that the gas was confined to a constant volume, 16 ml and the entire pressure change
was caused by uptake of O2 by the cells. The pressure was measured in a manometer, the fluid of which had a density of I .034 gm/ml. The entire apparatus was immersed in a thermostat at 37°C. In a 30 min. observation period the fluid in open side of manometer dropped 37 mm. neglecting the solubility of O2 in yeast suspension, compute rate of O2 consumed by the cells in It of O2 (S.T.P.) per hour.
Q16. Find the critical constant (Pc ,Vc and Tc) in terms of A and B, also find compressibility factor (z) for the following equation of state. PV = RT– where A and B are constant, P = pressure and V = molar volume.
Q. A mixture of C5H8 and H2 gas was placed in a container at a constant temperature. Initial volume of mixture was 10 ml. Sparking the mixture caused hydrogenation reaction
C5H8(g) + 2H2 (g) C5H12 (g)
Due to above reaction (on cooling) volume decreases by 6 ml. Excess of O2 was then added and on sparking the volume further decreased by 15 ml. Calculate
(i) Volume of each gas in original mixture.
(iii Mole fraction of C5H8 in original mixture.
Q. What is the density of moist air with 90 % relative humidity under the condition of 1 atm pressure and 21C. The vapor pressure of water at 25C is 23.7 torr and dry air has 76 % and 24 % . find the difference in the density of dry air and moist air at the given condition.