Advertisements
Advertisements
प्रश्न
Deduce the number of molecules of the following compound in the given quantity.
7.1g chlorine
उत्तर
No. of moles in chlorine = `"Mass of chlorine in grams"/"Molecular mass of chlorine"`
= `7.1/71`
= 0.1 mole
∴ 0.1 moles of Cl2 contains = 0.1 × 6.022 × 1023 molecules = 0.6022 × 1023 molecules.
∴ Number of molecules in 7.1 grams of chlorine is 6.022 × 1022.
APPEARS IN
संबंधित प्रश्न
Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?
Calculate the molar mass of the following substance:
Nitric acid, HNO3
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)
How many moles are represented by 100 g of glucose, C6H12O6 ? (C = 12 u, H = 1 u, O = 16 u)
How many moles of oxygen atoms are present in one mole of the following compounds ?
- Al2O3
- CO2
- Cl2O7
- H2SO4
- Al2(SO4)3
The ratio of moles of atoms in 12 g of magnesium and 16 g of sulphur will be :
What is the value of Avogadro's number?
What do you understand by the term mole? How many elementary units are in one mole of a substance?
Fill in the blank
One gram atom of an element contains ______ atoms.
Fill in the blank
Avogadro's number is equal to ______
Calculate the number of particles in 0.1 mole of any substance.
How many grams of Al are present in 0.2 mole of it?
Calculate the mass of 0.1 mole of the following:
CaCl2
(Ca = 40, Na=23, Mg =24, S=32, C = 12, Cl = 35.5, O=16, H=1)
Which of the following weighs the least?
Correct the statement, if required.
Under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of atoms.
One mole of any gas occupies ______ ml at S.T.P.
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)
Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225 g of pure HgS? Molar mass of Hg and S are 200.6 g mol–1 and 32 g mol–1 respectively.
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Calcium carbonate
