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प्रश्न
Fill in the following blanks :
0.5 mole of calcium element has a mass of ............... .
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उत्तर
0.5 moles of calcium element have a mass of 20g.
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संबंधित प्रश्न
Convert into mole.
12 g of oxygen gas
What name is given to the amount of substance containing 6.022 × 1023 particles(atoms,molecules or ions) of a substance ?
Fill in the following blanks :
A mole represents an .............. number of particles of a substance.
How many atoms are there in 0.25 mole of hydrogen ?
Define the term:
Avogadro’s number
Consider the following reaction and based on the reaction answer the questions that follow :
\[\ce{(NH4)2Cr2O7 ->[heat] N2(g) + 4H2O(g) + Cr2O3}\]
Calculate :
(i) The quantity in moles of (NH4)2Cr2O7 if 63 gm of (NH4)2Cr2O7 is heated.
(ii) The quantity in moles of nitrogen formed.
(iii) The volume in litres or dm3 of N2evolved at STP.
(iv) The mass in grams of Cr2O3 formed at the same time
[Atomic masses : H = 1, Cr=52, N=14]
Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)
Correct the statement, if required.
One mole of chlorine contains 6.023 x 1010 atoms of chlorine.
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)
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?
