Mole Concept in Balanced Reaction

Q.

Identify the correct balanced equation from the following chemical reactions.

1. ${\text{NaHCO}}_3\to {\text{Na}}_2{\text{CO}}_3+{\text{CO}}_2+{\text{H}}_2\text{O}$

2. ${\text{CaC}}_2+{\text{H}}_2\text{O}\to {\text{C}}_2{\text{H}}_2+{\text{Ca(OH)}}_2$

3. $\text{HgO}\to {\text{Hg + O}}_2$

4. ${\text{2ClO}}_2+{\text{H}}_2\text{O}\to {\text{HClO}}_2+{\text{HClO}}_3$

Q. Balanced chemical equations are equations in which the number of each type of atoms on the reactant side may or may not be equal to the number of respective atoms on the product side.

1. True
2. False

Q.

Which of these chemical equations is not balanced?

1. $2Mg\left(s\right)+O_2\left(g\right)\to 2MgO\left(s\right)$

2. $C{O}_2\left(g\right)+6H_{2}O\left(l\right)\to C_6{H}_{12}{O}_6\left(s\right)+6O_2\left(g\right)$

3. $CaC{O}_3\left(s\right)\to CaO\left(s\right)+C{O}_2\left(g\right)$

4. $CuC{l}_2\left(aq\right)+Pb\left(N{O}_3{)}_2\right(aq)\to Cu(N{O}_3{)}_2\left(aq\right)+PbC{l}_2\left(g\right)$

Q. Given below is a balanced chemical reaction for the formation of ammonia.

$N_2\left(g\right)+3H_2\left(g\right)\leftrightharpoons 2N{H}_3\left(g\right)$

Estimate the volume of hydrogen gas required to produce 44.8 litres of $N{H}_3$. (Assume the reaction takes place at STP)

1. 44.8 L
2. 11.2 L
3. 22.4 L
4. 67.2 L

Q. What mass of ${\text{MnO}}_2$ is required to produce 1.12 litres of chlorine gas at STP acccording to the given equation?

${\text{MnO}}_2\text{(s)}+\text{4HCl}\text{(aq)}\to {\text{MnCl}}_2\text{(aq)}+{\text{2H}}_2\text{O}\text{(l)}+{\text{Cl}}_2\text{(g)}$

Atomic masses of H = 1, Cl = 35.5, Mn = 55, O = 16

1. 4.35 g
2. 6.1 g
3. 25.2 g
4. 25.9 g

Q.

For the given reaction to be balanced, the number of atoms of an element on both side of the reaction should be equal.

1. True

2. False

Q.

For the chemical equation given below, what is the amount of methane required to produce 72 g of water?
$C{H}_4\left(g\right)+2O_2\left(g\right)\to C{O}_2\left(g\right)+2H_{2}O\left(l\right)$

1. 32 g

2. 44 g

3. 64 g

4. 16 g

Q. The amount of carbon dioxide produced when 40 g of methane reacts with 48 g of oxygen is.

1. 44 g
2. 33 g
3. 57 g

Q. In a chemical reaction the limiting reagent is the reactant that determines the amount of product being formed.

1. True
2. False

Q. The amount of carbon dioxide produced when 40 g of methane reacts with 48 g of oxygen is.

1. 44 g
2. 33 g
3. 57 g