Amixture of n2, o2, and ar has mole fractions of 0.25, 0.65, and 0.10, respectively. what is the pressure of n2 if the total pressure of the mixture is 3.9 bar? a. 0.67 barb. 1.33 barc. 0.98 bard. 0.39 bare. 2.5 bar

Partial pressure of nitrogen gas is 0.98 bar.

Explanation:

According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gases.

where,

= total pressure = 3.9 bar

= partial pressure of nitrogen gas  

= partial pressure of oxygen gas  

= partial pressure of argon gases  

= Mole fraction of nitrogen gas  = 0.25

= Mole fraction of oxygen gas  = 0.65

= Mole fraction of argon gases = 0.10

Partial pressure of nitrogen gas :

Partial pressure of oxygen gas :

Partial pressure of argon gas :

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.