Advertisements
Advertisements
प्रश्न
Deduce the number of molecules of the following compound in the given quantity.
7.1 g chlorine
Advertisements
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
∴ The number of molecules in 7.1 grams of chlorine is 6.022 × 1023
APPEARS IN
संबंधित प्रश्न
Calculate the molar mass of the following substance:
Ethyne, C2H2
- The percentage composition of a gas is:
Nitrogen 82.35%, Hydrogen 17.64%. - Find the empirical formula of the gas. [N = 14, H = 1]
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 ?
Fill in the following blanks :
64 g of oxygen gas contains ................ moles of oxygen atoms.
What is meant by ‘a mole of carbon atoms’ ?
The ratio of moles of atoms in 12 g of magnesium and 16 g of sulphur will be :
Explain with examples what is meant by a 'mole' of a substance.
Deduce the number of molecules of the following compound in the given quantity.
32g oxygen
Define the term.
Molar volume
Define the term:
Avogadro’s number
What do you understand by the term mole? How many elementary units are in one mole of a substance?
Two oxides of a metal (M) have 20.12% and 11.19% oxygen. The formula of the first oxide is MO. Determine the formula of the second oxide.
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure.
(a) Find the number of moles of hydrogen present
(b) What weight of CO2can the cylinder hold under similar conditions of temperature and pressure? (H = 1 C = 12, O = 16)
(c) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder with the same conditions of temperature and pressure.
(d) State the law that helped you to arrive at the above result.
Find the number of molecules in 1.8 g of H2O.
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)
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)
How many grams are there in the following?
4 moles of the phosphorous molecule, P4
The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
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 | - |
