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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
What is the mass of 4 moles of aluminium atoms (Atomic mass of aluminium = 27)?
If the aluminium salt of an anion X is Al2X3, what is the valency of X ? What will be the formula of the magnesium salt of X ?
What is the mass of 5 moles of sodium carbonate (Na2CO3) ?
(Atomic masses : Na = 23 u ; C = 12 u ; O = 16 u)
Calculate the weight of one molecule of oxygen.
[Avogadro’s number = 6 × 1023, O = 16 ]
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]
The molecular formula for elemental sulphur is S8.In a sample of 5.12 g of sulphur:
How many molecules and atoms are present?
Which of the following weighs the least?
Four grams of caustic soda contains ______.
Calculate the number of oxygen atoms in 0.10 mole of Na2CO3 . 10H2O.
Deduce the number of molecules of the following compound in the given quantity.
90g water
