Mole Concept and Avogadro's Number

Q.

What is the volume strength of 1.5 N ${\mathrm{H}}_2{\mathrm{O}}_2$ solution?

Q.

Find out the molarity of $30\mathrm{g}$ of $\mathrm{Co}{\left({\mathrm{NO}}_3\right)}_2.6{\mathrm{H}}_2\mathrm{O}$ in $4.3\mathrm{L}$ of solution.

Q.

The number of moles of carbon dioxide which contain 8 g of oxygen is:

1. 0.5 mol
2. 0.25 mol
3. 0.20 mol
4. 0.40 mol

Q.

The cost of table salt (NaCl) and table sugar (C₁₂H₂₂O₁₁) is 2rs per kg and 6rs per kg, respectively. Calculate their costs per mole.

Q.

Mass of 1 atom of Hydrogen is _____

1. 1.66 g

2. 1.67 g

3. 6.022 g

4. 6.022 g

Q.

What is meant by mole?

Q.

4.4 g of a gas at STP occupies a volume of 2.24 L. The gas can be:

Q.

How to calculate atomic mass of an element ?

Q. Chlorophyll contains 2.68% of magnesium by mass. Calculate the number of magnesium atoms in 2 gram of chlorophyll

Q. The number of carbon atoms present in a signature, if a signature written by carbon pencil weights $1.2\times {10}^{-3}g$ is

1. 
2. 
3. 
4. 

Q.

Definition of mole.

Q. The mass of 100 molecules of sucrose
$C_{12}{H}_{22}{O}_{11}$ is g.

1. 5.679 $\times {10}^{-22}$
2. 5.679 $\times {10}^{-20}$
3. 5.679 $\times {10}^{-21}$
4. 5.679 $\times {10}^{-23}$

Q.

Molecular mass of ${\mathrm{KNO}}_3$ is?

Q.

What is the molar mass of iron $\left(\mathrm{III}\right)$ oxide $\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$?

Q.

One mole of ${\mathrm{CO}}_2$ contains-

Q.

124amu of P₄ will contain________.

1. 4 Atoms of Phosphorus

2. 4N_A Atoms of Phosphorus

3. N_A Molecules of Phosphorus

4. Both (B) and (C)

Q.

Calculate the number of atoms in each of the following :
(a) 52 moles of He,
(b) 52 Amu of He,
(c) 52 g Of He.

Q.

The number of chlorine atoms in $20\mathrm{mL}$ of chlorine gas at STP is ………${10}^{21}$.

Q.

Which has the maximum number of molecules?

1. $2\mathrm{g}{\mathrm{H}}_2$

2. $7\mathrm{g}{\mathrm{N}}_2$

3. $16\mathrm{g}{\mathrm{O}}_2$

4. $16\mathrm{g}{\mathrm{NO}}_2$

Q.

Determine the no. of molecules in a drop of water which weighs 0.09 g.

Q.

Calculate the number of:
(a) Particles in 0.1 moles of any substance,
(b) Hydrogen atoms in 0.1 mole of $H_{2}S{O}_4$
(c) Molecules in one kg of calcium chloride.

Q.

Calculate the number of atoms of each type in 5.3g of $N{a}_{2}C{O}_3$?

1. $0.1N_A$ atoms of Na, $0.05N_A$ atoms of Carbon, $0.15N_A$ atoms of Oxygen.

2. $0.12N_A$ atoms of Na, $0.06N_A$ atoms of Carbon, $0.15N_A$ atoms of Oxygen.

3. $0.15N_A$ atoms of Na, $0.06N_A$ atoms of Carbon, $0.15N_A$ atoms of Oxygen.

4. $0.2N_A$ atoms of Na, $0.05N_A$ atoms of Carbon, $0.25N_A$ atoms of Oxygen.

Q.

The equivalent weight of $\mathrm{Cu}$ in ${\mathrm{Cu}}_2\mathrm{O}$ is?

Q.

How many atoms of hydrogen and oxygen are present in 0.15 moles of water.

Q.

1 mol of $C{H}_4$ contains

1. 4 g atom of Hydrogen

2. 3.0 g of carbon

3. $1.81\times {10}^{23}$ molecules of $C{H}_4$

4. $6.02\times {10}^{23}$ atoms of H

Q.

The total number of atoms of all elements present in 1 mole of ammonium dichromate is

1. 6X10²⁹

2. 114X10²³

3. 19

4. 14

Q.

The no of neutrons in 1.6 g of CH₄

Q.

Calculate the number of moles in 16g of ${\mathrm{SO}}_2$?

Q.

(a) The mass of 5.6 litres fo a certain gas at STP is 12 g. What is the relative molecular mass or molar mass of the gas?
(b) Calculate the volume occupied at S.T.P. by 2 moles of $S{O}_2$

Q. Mass number of silicon is

1. 28
2. 27
3. 25
4. 23