Q5.35P - Chemistry: Molecular Nature Of Matter And Change

Question

To collect a beaker of ${\mathbf{H}}_{\mathbf{2}}$   gas by displacing the air already in the beaker, would you hold the beaker upright or inverted? Why? How would you hold the beaker to collect ${\mathbf{CO}}_{\mathbf{2}}$ ?

Step-by-Step Solution

Answer

The  ${\text{CO}}_{\text{2}}$  gas will be collected in the beaker upright and the ${\text{H}}_{\text{2}}$   gas will be collected inverted.

Step 1: Carbon dioxide and H 2 gas.

The molecular mass of ${\text{CO}}_{\text{2}}$   is 44 g/mol.

 

The molecular mass of  ${\text{H}}_{\text{2}}$  is 2 g/mol.

 

The molar mass of carbon dioxide is also greater than air.

Step 2: Beaker for collection of H 2 and CO 2 .

• To collect the ${\mathrm{H}}_2$  gas beaker will be inverted as it is lighter than air.

 

• To collect the carbon dioxide gas the beaker will be upright as it is heavier than air.