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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
If one mole of carbon atoms weighs 12 gram, what is the mass (in gram) of 1 atom of carbon?
What is the mass of 1 mole of nitrogen atoms?
What is the mass of 4 moles of aluminium atoms (Atomic mass of aluminium = 27)?
What is the mass of 10 moles of sodium sulphite (Na2SO3)?
The percentage composition of a gas is Nitrogen 82.35%, Hydrogen 17.64%. Find the empirical formula of the gas. [N = 14, H = 1]
What name is given to the amount of substance containing 6.022 × 1023 particles(atoms,molecules or ions) of a substance ?
If 16 g of oxygen contains 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.
Calculate the mass in grams of 0.17 mole of hydrogen sulphide, H2S. (Atomic masses : H = 1 u, S = 32 u)
Which of the following pair of elements represents a mole ratio of 1 : 1 ?
The relative atomic mass of Cl atom is 35.5 a.m.u. Explain this statement.
Define the term.
Molar volume
Calculate the number of moles and number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene?
A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP)
NH4NO3 → N2O + 2H2O
What volume of dinitrogen oxide is produced at the same time as 8.96 L of steam?
Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)
Define the term:
Relative molecular mass
Find the number of molecules in 1.8 g of H2O.
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 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
Calcium chloride when dissolved in water dissociates into its ions according to the following equation.
\[\ce{CaCl2} (aq) → {Ca^{2+} (aq) + 2{Cl}- (aq)}\]
Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water.
