Answer:
The answer to the question is
Chlorine Cl₂
Explanation:
Graham's Law of effusion states that the rate of effusion of a gas is inversely proportional to the square root of the molar mass
[tex]\frac{R_{1} }{R_{2}} = \sqrt{ \frac{M_{2}}{M_{1}} }[/tex]
0.238 = [tex]\sqrt{ \frac{4}{M_{1}} }[/tex]
Therefore M₁ = 4÷0.238² = 70.61
Hence the mass of the gas is 70.61, that is X₂ = 70.61 or the molar mass of the element X = 70.61÷2 = 35.308 ≅35.453 Hence the gas is chlorine Cl₂
