Advertisements
Advertisements
Question
How many atoms are there in 0.25 mole of hydrogen ?
Advertisements
Solution
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
RELATED QUESTIONS
Calculate the molar mass of the following substance:
Sulphur molecule, S8
Calculate the molar mass of the following substance:
Nitric acid, HNO3
Convert into mole.
20 g of water
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure
1) Find the number of moles of hydrogen present.
2) What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (H = 1, C = 12, O = 16)
3) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder under the same conditions of temperature and pressure.
4) State the law that helped you to arrive at the above result.
Fill in the following blanks :
0.5 mole of calcium element has a mass of ............... .
How many moles of calcium carbonate (CaCO3) are present in 10 g of the substance ? (Ca = 40 u ; C = 12 u ; O = 16 u)
Define the term:
Relative molecular mass
Calculate the number of moles of CO2 which contain 8.00 g of O2
Four grams of caustic soda contains ______.
Solid ammonium dichromate decomposes as:
\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]
If 63 g of ammonium dichromate decomposes. Calculate the quantity in moles of (NH4)2Cr2O7.
