Question

20. What do you understand by the terms : Gram molecule
and gram molecular volume ? What is meant by
Avogadro's number ? What will be mass of 150 ml of
oxygen collected over water at 15°C and 740 mm
pressure ? (Aq. tension 15°C = 13 mm).
Given that the Avogadro number is 6.023 x 1025,
calculate in gms the mass of one molecule of oxygen.
Will this mass be effected by the change in temperature
and pressure ?​

Answer 1

Answer:

Gram molecule-Gram molecule is defined as the number of grams of a substance that is the same as the relative molecular mass of that substance. A mole is defined as 6.02... ⋅1023 molecules, atoms, ions or whatever.

Gram Molecular Volume-The gram molecular volume, is the volume occupied by one mole of a substance at a given temperature and pressure. Gram molecular volume of oxygen at STP is 22.4l.

Avogadro's Number-Definition of Avogadro's number. : the number 6.022 × 1023 indicating the number of atoms or molecules in a mole of any substance. — called also Avogadro number.

This problem can be solved using the combined gas law:

This problem can be solved using the combined gas law:P1V1/T1 = P2V2/T2

This problem can be solved using the combined gas law:P1V1/T1 = P2V2/T2where P1, V1, and T1 are the pressure, volume and temperature at state one, and P2,V2, T2 are the corresponding values at state 2.

This problem can be solved using the combined gas law:P1V1/T1 = P2V2/T2where P1, V1, and T1 are the pressure, volume and temperature at state one, and P2,V2, T2 are the corresponding values at state 2.To find the pressure of the dry gas you have to subtract the partial pressure of the water vapor which is given as 0.0318 bar.

This problem can be solved using the combined gas law:P1V1/T1 = P2V2/T2where P1, V1, and T1 are the pressure, volume and temperature at state one, and P2,V2, T2 are the corresponding values at state 2.To find the pressure of the dry gas you have to subtract the partial pressure of the water vapor which is given as 0.0318 bar.So the initial conditions are:

P1 = 0.948 - 0.0318 = 0.9162 bar

Bhai Bas Aur Nhi Ata Baaki Ka Tu Dekhle