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प्रश्न
Fill in the following blanks :
A mole represents an .............. number of particles of a substance.
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उत्तर
A mole represents the Avogadro number of particles of a substance.
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संबंधित प्रश्न
Calculate the molar mass of the following substance:
Nitric acid, HNO3
What is meant by ‘a mole of carbon atoms’ ?
A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP)
NH4NO3 → N2O + 2H2O
Determine the percentage of oxygen in the ammonium nitrate?
Complete the following calculations. Show working for complete credit :
Calculate the mass of calcium that will contain the same number of atoms as are present in 3.2 gm of Sulphur. [Atomic masses : S = 32, Ca = 40]
Find the number of molecules in 1.8 g of H2O.
Calculate the number of moles of methane in 0.80 g of methane.
Calculate the number of atoms in the following:
52 g of He
Calculate the number of moles in 7g of nitrogen.
N2 + 3H2 → 2NH3
(The atomic mass of nitrogen is 14, and that of hydrogen is 1)
1 mole of nitrogen (______ g) +
3 moles of hydrogen (______ g) →
2 moles of ammonia (______ g)
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
magnesium oxide
