If air consists of 77% by weight of nitrogen and 23% by weight of oxyg

1.	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.

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

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