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प्रश्न
Fill in the following blanks :
0.5 mole of calcium element has a mass of ............... .
उत्तर
0.5 moles of calcium element have a mass of 20g.
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संबंधित प्रश्न
What name is given to the amount of substance containing 6.022 × 1023 particles(atoms,molecules or ions) of a substance ?
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(Atomic masses : Na = 23 u ; C = 12 u ; O = 16 u)
What weight of each element is present in 1.5 moles of sodium sulphite, Na2SO3 ?
(Atomic masses : Na = 23 u ; S = 32 u ; O = 16 u)
What is the value of Avogadro's number?
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?
Which of the following would weight the least?
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Calculate the number of moles in 1.51 × 1023 molecules of NH4Cl.
Fill in the missing data in the Table
| Species Property | H2O | CO2 | Na atom | MgCl2 |
| No. of moles | 2 | - | - | 0.5 |
| No. of particles | - | 3.011×1023 | - | - |
| Mass | 36g | - | 115 g | - |
The visible universe is estimated to contain 1022 stars. How many moles of stars are present in the visible universe?
