Advertisements
Advertisements
प्रश्न
Under the same conditions of temperature and pressure you collect 2L of carbon dioxide, 3L of chlorine, 5L of hydrogen, 4L of nitrogen and 1L of sulphur dioxide. In which gas sample will there be :
a. The greatest number of molecules.
b. The least number of molecules.
Justify your answer.
उत्तर
Calculation of number of molecules in each gas sample:
(i) 2L of carbon dioxide :
22.4L of carbon dioxide has = 6.023 x 1023 molecules
2L of carbon dioxide will have = 6.023 x 1023 x 2/22.4
= 0.5377 x 1023 molecules
(ii ) 3L of chlorine :
22.4L of chlorine has = 6.023 x 1023 molecules
3L of chlorine will have = 6.023 x 1023 x 3/22.4
= 0.8066 x1023molecules
(iii ) 5L of hydrogen :
22.4L of hydrogen has = 6.023 x 1023 molecules
5L of hydrogen will have = 6.023 x 1023 x 5/ 22.4
= 1.34 x1023 molecules
(iv) 4L of nitrogen :
22 .4 L of nitrogen has = 6.023 x 1023 molecules
4 L of nitrogen will have = 6.023 x 1023 x 4/ 22 .4
= 1.07 x1023 molecules
(v) 1L of sulphur dioxide :
22.4L of sulphur dioxide has = 6.023 x 1023 molecules
1 L of sulphur dioxide will have = 6.023 x 1023 x 1/22.4
= 0.27 x1023 molecules
From the above calculation of number of molecules in different gases we can conclude that the :
(a)The greatest number of molecules are present in 5L of hydrogen gas sample.
(b )The least number of molecules is in 1L of sulphur dioxide gas sample.
APPEARS IN
संबंधित प्रश्न
Samples of the gases O2, N2, CO2 and CO under the same conditions of temperature and pressure contain the same number of molecules represented by X. The molecules of Oxygen, occupy V litres and have a mass of 8 g. Under the same conditions of temperature and pressure :
What is the volume occupied by : X molecules of N2.
What volume of oxygen is required to burn completely a mixture of 22.4 dm3 of methane and 11 .2 dm3 of hydrogen in to carbon dioxide and steam? Equations of the reactions are given below:
CH4 + 2O2 → CO2 + 2H2O
2H2 + O2 → 2H2O
560ml of carbon monoxide is mixed with 500ml of oxygen and ignited. The chemicaI equation for the reaction is as folIows:
2CO + O2 → 2CO2
Calculate the volume of oxygen used and carbon dioxide formed in the above reaction.
O2 is evolved by heating KCIO3 using MnO2 as a catalyst.
\[\ce{2KCI3 ->[MnO2] 2KCl + 3O2}\]
- Calculate the mass of KClO3 required to produce 6.72 litres of O2 at STP. [atomic masses of K = 39, Cl = 35.5, O = 16].
- Calculate the number of moles of oxygen present in the above volume and also the number of molecules.
- Calculate the volume occupied by 0.01 mole of CO2 at STP.
Define atomicity of a gas. State the atomicity of Hydrogen, Phosphorus and Sulphur.
200 cm3 of hydrogen and 150 cm3 of oxygen are mixed and ignited, as per the following reaction,
\[\ce{2H2 + O2 → 2H2O}\]
What volume of oxygen remains unreacted?
The reaction between the red lead and hydrochloric acid is given below:
\[\ce{Pb3O4 + 8HCl -> 3PbCl2 + 4H2O + Cl2}\]
Calculate the mass of lead chloride formed by the action of the 6.85 g of red lead.
Pure calcium carbonate and dilute hydrochloric acid are reacted and 2 litres of carbon dioxide were collected at 27oC and normal pressure.
\[\ce{CaCO3 + 2HCl -> CaCl2 + H2O + CO2}\]
Calculate the mass of salt required.
Nitrogen and hydrogen react to form ammonia.
\[\ce{N2_{(g)} + 3H2_{(g)}-> 2NH3_{(g)}}\]
If 1000g of H2 reacts with 2000g of N2.
Calculate the mass of ammonia (NH3) that will be formed.
Concentrated nitric acid oxidizes phosphorus to phosphoric acid according to the following equation:
\[\ce{P + 5HNO3 -> H3PO4 + 5NO2 + H2O}\]
If 6.2 g of phosphorus was used in the reaction, calculate the mass of nitric acid consumed at the same time.
