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At 25 degree Celsius consider the density of the water is 1g/l and that of propanol to be 0.925g/l.what volume of propanol will have same number of molecules as present in 210 ml of water?
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At 25 degree Celsius consider the density of the water is 1g/l and tha...
Calculating the number of molecules in 210 ml of water

- Density of water = 1 g/l
- Volume of water = 210 ml
- Mass of water = Density x Volume = 1 x 210 = 210 g
- Molar mass of water = 18 g/mol (from periodic table)
- Number of moles of water = Mass/Molar mass = 210/18 = 11.67 moles
- Avogadro's number = 6.022 x 10^23 molecules/mol
- Number of molecules of water = Number of moles x Avogadro's number = 11.67 x 6.022 x 10^23 = 7.022 x 10^24 molecules

Calculating the volume of propanol with the same number of molecules as water

- Density of propanol = 0.925 g/l
- Molar mass of propanol = 60.1 g/mol (from periodic table)
- Number of moles of propanol = Number of molecules/Avogadro's number = 7.022 x 10^24/6.022 x 10^23 = 11.66 moles
- Mass of propanol = Number of moles x Molar mass = 11.66 x 60.1 = 700.666 g
- Volume of propanol = Mass/Density = 700.666/0.925 = 756.89 ml

Conclusion

Therefore, 756.89 ml of propanol will have the same number of molecules as present in 210 ml of water at 25 degrees Celsius.
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For certain substances such as ammonium chloride, nitrogen peroxide, phosphorus pentachloride, etc. the measured densities are found to be less than those calculatedfrom their molecular formula. The observed densities decrease towards a limit as thetemperature is raised. This is due to the splitting of the molecules into simpler ones. The process is reversible and is called thermal dissociation.Examples :With increase in the number of molecules, the volume increases (pressure remaining constant) and, in consequence, the density decreases. As the temperature rises, more and more dissociation takes place, and when practically complete dissociation occursthe density reaches its lowest limit.The extent of issociation, ice., the fraction of the total number of molecules which suffers dissociation is called the degree of dissociation. Gas density measurements can be used to determine the degree of dissociation. Let us take by general case where one molecule of a substance A splits up into n molecule of B on heating; i.e.,t = 0 at = teq a x nx Total no. of moles Observed molecular weight or molar mass of the mixtureQ.If the total mass of the mixture in the above case is 300 gm, the moles at C(g) present are.

For certain substances such as ammonium chloride, nitrogen peroxide, phosphorus pentachloride, etc. the measured densities are found to be less than those calculatedfrom their molecular formula. The observed densities decrease towards a limit as thetemperature is raised. This is due to the splitting of the molecules into simpler ones. The process is reversible and is called thermal dissociation.Examples :With increase in the number of molecules, the volume increases (pressure remaining constant) and, in consequence, the density decreases. As the temperature rises, more and more dissociation takes place, and when practically complete dissociation occursthe density reaches its lowest limit.The extent of issociation, ice., the fraction of the total number of molecules which suffers dissociation is called the degree of dissociation. Gas density measurements can be used to determine the degree of dissociation. Let us take by general case where one molecule of a substance A splits up into n molecule of B on heating; i.e.,t = 0 at = teq a x nx Total no. of moles Observed molecular weight or molar mass of the mixtureQ.A sample of mixture of A(g), B(g) and C(g) under equilibrium has a mean molecular weight (observe d) is 80.The equilibrium is Find the degree of dissociation for A(g).

For certain substances such as ammonium chloride, nitrogen peroxide, phosphorus pentachloride, etc. the measured densities are found to be less than those calculatedfrom their molecular formula. The observed densities decrease towards a limit as thetemperature is raised. This is due to the splitting of the molecules into simpler ones. The process is reversible and is called thermal dissociation.Examples :With increase in the number of molecules, the volume increases (pressure remaining constant) and, in consequence, the density decreases. As the temperature rises, more and more dissociation takes place, and when practically complete dissociation occursthe density reaches its lowest limit.The extent of issociation, ice., the fraction of the total number of molecules which suffers dissociation is called the degree of dissociation. Gas density measurements can be used to determine the degree of dissociation. Let us take by general case where one molecule of a substance A splits up into n molecule of B on heating; i.e.,t = 0 at = teq a x nx Total no. of moles Observed molecular weight or molar mass of the mixtureQ.The K for the reaction is 640 mm at 775 K. The percentage dissociation of N2O4 at equilibrium pressure of 160 mm is

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At 25 degree Celsius consider the density of the water is 1g/l and that of propanol to be 0.925g/l.what volume of propanol will have same number of molecules as present in 210 ml of water?
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