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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.
22 g of carbon dioxide
What name is given to the amount of substance containing 6.022 × 1023 particles(atoms,molecules or ions) of a substance ?
How many moles are 3.6 g of water ?
How many moles of O2 are there in 1.20 × 1022 oxygen molecules ?
Calculate the mass in grams of 0.17 mole of hydrogen sulphide, H2S. (Atomic masses : H = 1 u, S = 32 u)
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Sodium chloride
Define the term Relative atomic mass.
Two oxides of a metal (M) have 20.12% and 11.19% oxygen. The formula of the first oxide is MO. Determine the formula of the second oxide.
A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP)
NH4NO3 → N2O + 2H2O
What mass of ammonium nitrate should be heated to produce 8.96L of steam?
Correct the following statement :
Equal masses of all gases under identical conditions contain the same number of molecules.
Calculate the mass of 0.1 mole of the following:
CaCO3
(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 moles of He
The molecular formula for elemental sulphur is S8. In a sample of 5.12 g of sulphur:
How many moles of sulphur are present?
Correct the statement, if required.
Under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of atoms.
From the equation for burning of hydrogen and oxygen
\[\ce{2H2 + O2 -> 2H2O}\] (Steam)
Write down the number of mole (or moles) of steam obtained from 0.5 moles of oxygen.
The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
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
