Question

The volume occupied by 8 grams of oxygen gas at STP is ______ litres. [Atomic weight of O = 16]

पर्याय

• 5.6

• 8.96

Answer 1

The volume occupied by 8 grams of oxygen gas at STP is 5.6 litres. [Atomic weight of O = 16]

Explanation:

Oxygen gas exists as diatomic molecules (O₂). Given the atomic weight of oxygen is 16, the molar mass of O₂ is:

16 × 2 = 32 g/mol

The number of moles (n) = `"Mass"/"Molar mass"`

= `8/32`

= 0.25 moles

At Standard Temperature and Pressure (STP), 1 mole of any ideal gas occupies 22.4 litres.

Volume = moles × 22.4 L/imol

= 0.25 × 22.4

= 5.6 litres