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प्रश्न
Explain with examples what is meant by a 'mole' of a substance.
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उत्तर
A mole is the quantity of a substance whose mass in grams is equal in magnitude to the molecular mass of that substance in Daltons. Thus, the molecular mass of oxygen is 32 u, and therefore 32g oxygen is 1 mole of oxygen. The molecular mass of water is 18u. Therefore, 18g of water makes 1 mole of water.
1 mole of a compound is the mass of that substance in grams equal in magnitude to its molecular mass. The SI unit is mol.
Number of moles of substances (n) = `"Mass of substance in grams"/"Molecular mass of substance"`
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संबंधित प्रश्न
Calculate the molar mass of the following substance:
Hydrochloric acid, HCl
Convert into mole.
20 g of water
How many moles of O2 are there in 1.20 × 1022 oxygen molecules ?
If 16 g of oxygen contains 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.
Show by means of calculations that 5 moles of CO2 and 5 moles of H2O do not have the same mass. How much is the difference in their masses ?
Deduce the number of molecules of the following compound in the given quantity.
32g oxygen
Define the term Relative atomic mass.
Which of the following would weight the least?
[Atomic masses : Ag = 108, N - 14, O = 16,C = 12]
Find the number of molecules in 73 g of HCl.
Find the number of moles in 10 g of CaCO3.
Calculate the number of moles of methane in 0.80 g of methane.
Calculate the mass of 0.1 mole of the following:
CaCl2
(Ca = 40, Na=23, Mg =24, S=32, C = 12, Cl = 35.5, O=16, H=1)
Calculate the number of atoms in the following:
52 g of He
Calculate the number of moles in 7g of nitrogen.
One mole of any gas occupies ______ ml at S.T.P.
Calculate the number of moles in 1.51 × 1023 molecules of NH4Cl.
How many grams are there in the following?
3 moles of chlorine molecule, Cl2.
Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight.
- Whose container is heavier?
- Whose container has more number of atoms?
Deduce the number of molecules of the following compound in the given quantity.
90g water
Deduce the number of molecules of the following compound in the given quantity.
8.8g carbon dioxide
