02. Mole Concept and Molar Mass
Some Basic Concepts of Chemistry

228339 Production of iron in blast furnace follows the following equation:
$\mathrm{Fe}_3 \mathrm{O}_4(\mathrm{~s})+4 \mathrm{CO}(\mathrm{g}) \rightarrow 3 \mathrm{Fe}(1)+4 \mathrm{CO}_2(\mathrm{~g})$
When $4.640 \mathrm{~kg}$ of $\mathrm{Fe}_3 \mathrm{O}_4$ and $2.520 \mathrm{~kg}$ of $\mathrm{CO}$ are allowed to react then the amount of iron (in g) produced is:
[Given: Molar Atomic mass $\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathrm{Fe}=$ 56
Molar Atomic mass $\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathbf{O}=16$
Molar Atomic mass $\left.\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathrm{C}=12\right]$

1 1400
2 2200
3 3360
4 4200
Some Basic Concepts of Chemistry

228340 The maximum number of molecules is present in

1 $15 \mathrm{~L}$ of $\mathrm{H}_2$ gas at $\mathrm{STP}$
2 $5 \mathrm{~L}$ of $\mathrm{N}_2$ gas at $\mathrm{STP}$
3 $0.5 \mathrm{~g}$ of $\mathrm{H}_2$ gas
4 $10 \mathrm{~g}$ of $\mathrm{H}_2$ gas
Some Basic Concepts of Chemistry

228341 $10 \mathrm{gm}$ of hydrogen and $64 \mathrm{~g}$ of oxygen were kept in a steel vessel and exploded. Amount of water produced in this reaction will be

1 $2 \mathrm{~mol}$
2 $4 \mathrm{~mol}$
3 $8 \mathrm{~mol}$
4 $10 \mathrm{~mol}$
Some Basic Concepts of Chemistry

228342 The mass of one mole of electron is

1 $9.1 \times 10^{-28} \mathrm{~g}$
2 $0.55 \mathrm{mg}$
3 $9.1 \times 10^{-24} \mathrm{~g}$
4 $610^{-12} \mathrm{~g}$
Some Basic Concepts of Chemistry

228339 Production of iron in blast furnace follows the following equation:
$\mathrm{Fe}_3 \mathrm{O}_4(\mathrm{~s})+4 \mathrm{CO}(\mathrm{g}) \rightarrow 3 \mathrm{Fe}(1)+4 \mathrm{CO}_2(\mathrm{~g})$
When $4.640 \mathrm{~kg}$ of $\mathrm{Fe}_3 \mathrm{O}_4$ and $2.520 \mathrm{~kg}$ of $\mathrm{CO}$ are allowed to react then the amount of iron (in g) produced is:
[Given: Molar Atomic mass $\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathrm{Fe}=$ 56
Molar Atomic mass $\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathbf{O}=16$
Molar Atomic mass $\left.\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathrm{C}=12\right]$

1 1400
2 2200
3 3360
4 4200
Some Basic Concepts of Chemistry

228340 The maximum number of molecules is present in

1 $15 \mathrm{~L}$ of $\mathrm{H}_2$ gas at $\mathrm{STP}$
2 $5 \mathrm{~L}$ of $\mathrm{N}_2$ gas at $\mathrm{STP}$
3 $0.5 \mathrm{~g}$ of $\mathrm{H}_2$ gas
4 $10 \mathrm{~g}$ of $\mathrm{H}_2$ gas
Some Basic Concepts of Chemistry

228341 $10 \mathrm{gm}$ of hydrogen and $64 \mathrm{~g}$ of oxygen were kept in a steel vessel and exploded. Amount of water produced in this reaction will be

1 $2 \mathrm{~mol}$
2 $4 \mathrm{~mol}$
3 $8 \mathrm{~mol}$
4 $10 \mathrm{~mol}$
Some Basic Concepts of Chemistry

228342 The mass of one mole of electron is

1 $9.1 \times 10^{-28} \mathrm{~g}$
2 $0.55 \mathrm{mg}$
3 $9.1 \times 10^{-24} \mathrm{~g}$
4 $610^{-12} \mathrm{~g}$
Some Basic Concepts of Chemistry

228339 Production of iron in blast furnace follows the following equation:
$\mathrm{Fe}_3 \mathrm{O}_4(\mathrm{~s})+4 \mathrm{CO}(\mathrm{g}) \rightarrow 3 \mathrm{Fe}(1)+4 \mathrm{CO}_2(\mathrm{~g})$
When $4.640 \mathrm{~kg}$ of $\mathrm{Fe}_3 \mathrm{O}_4$ and $2.520 \mathrm{~kg}$ of $\mathrm{CO}$ are allowed to react then the amount of iron (in g) produced is:
[Given: Molar Atomic mass $\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathrm{Fe}=$ 56
Molar Atomic mass $\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathbf{O}=16$
Molar Atomic mass $\left.\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathrm{C}=12\right]$

1 1400
2 2200
3 3360
4 4200
Some Basic Concepts of Chemistry

228340 The maximum number of molecules is present in

1 $15 \mathrm{~L}$ of $\mathrm{H}_2$ gas at $\mathrm{STP}$
2 $5 \mathrm{~L}$ of $\mathrm{N}_2$ gas at $\mathrm{STP}$
3 $0.5 \mathrm{~g}$ of $\mathrm{H}_2$ gas
4 $10 \mathrm{~g}$ of $\mathrm{H}_2$ gas
Some Basic Concepts of Chemistry

228341 $10 \mathrm{gm}$ of hydrogen and $64 \mathrm{~g}$ of oxygen were kept in a steel vessel and exploded. Amount of water produced in this reaction will be

1 $2 \mathrm{~mol}$
2 $4 \mathrm{~mol}$
3 $8 \mathrm{~mol}$
4 $10 \mathrm{~mol}$
Some Basic Concepts of Chemistry

228342 The mass of one mole of electron is

1 $9.1 \times 10^{-28} \mathrm{~g}$
2 $0.55 \mathrm{mg}$
3 $9.1 \times 10^{-24} \mathrm{~g}$
4 $610^{-12} \mathrm{~g}$
Some Basic Concepts of Chemistry

228339 Production of iron in blast furnace follows the following equation:
$\mathrm{Fe}_3 \mathrm{O}_4(\mathrm{~s})+4 \mathrm{CO}(\mathrm{g}) \rightarrow 3 \mathrm{Fe}(1)+4 \mathrm{CO}_2(\mathrm{~g})$
When $4.640 \mathrm{~kg}$ of $\mathrm{Fe}_3 \mathrm{O}_4$ and $2.520 \mathrm{~kg}$ of $\mathrm{CO}$ are allowed to react then the amount of iron (in g) produced is:
[Given: Molar Atomic mass $\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathrm{Fe}=$ 56
Molar Atomic mass $\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathbf{O}=16$
Molar Atomic mass $\left.\left(\mathrm{g} \mathrm{mol}^{-1}\right): \mathrm{C}=12\right]$

1 1400
2 2200
3 3360
4 4200
Some Basic Concepts of Chemistry

228340 The maximum number of molecules is present in

1 $15 \mathrm{~L}$ of $\mathrm{H}_2$ gas at $\mathrm{STP}$
2 $5 \mathrm{~L}$ of $\mathrm{N}_2$ gas at $\mathrm{STP}$
3 $0.5 \mathrm{~g}$ of $\mathrm{H}_2$ gas
4 $10 \mathrm{~g}$ of $\mathrm{H}_2$ gas
Some Basic Concepts of Chemistry

228341 $10 \mathrm{gm}$ of hydrogen and $64 \mathrm{~g}$ of oxygen were kept in a steel vessel and exploded. Amount of water produced in this reaction will be

1 $2 \mathrm{~mol}$
2 $4 \mathrm{~mol}$
3 $8 \mathrm{~mol}$
4 $10 \mathrm{~mol}$
Some Basic Concepts of Chemistry

228342 The mass of one mole of electron is

1 $9.1 \times 10^{-28} \mathrm{~g}$
2 $0.55 \mathrm{mg}$
3 $9.1 \times 10^{-24} \mathrm{~g}$
4 $610^{-12} \mathrm{~g}$