Advertisements
Advertisements
प्रश्न
How many atoms are there in 0.25 mole of hydrogen ?
उत्तर
0.25 moles of hydrogen
Number of hydrogen atoms in 1 mole = 6.022 × 1023
Therefore, number of atoms in 0.25 moles = 6.022 × 1023 × 0.25 = 1.50 × 1023 atoms
Hence, number of hydrogen atoms in 0.25 moles is 1.50 × 1023
APPEARS IN
संबंधित प्रश्न
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 ?
How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)
Show by means of calculations that 5 moles of CO2 and 5 moles of H2O do not have the same mass. How much is the difference in their masses ?
A flask contains 3.2g of sulphur dioxide.Calculate the following : The moles of sulphur dioxide present in the flask.
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?
Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)
Calculate the number of molecules in one Kg of calcium chloride.
One mole of any gas occupies ______ ml at S.T.P.
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?
