Question

0.75 mol of solid X4 and 2 mol of O2 are heated in a closed container to form only one gaseous compound. The ratio of the final pressure at 327∘C to the initial pressure at 27∘C in the flask is?

• A. 0.75
• B. 1
• C. 1.5
• D. 2

Answer 1

• The correct option is D 1
• Mole atoms of X=0.75×4=3; Mole atoms of O=2×2=4
• Hence, the product is X₃O₄(g)
• Initial moles of gaseous reactants, n₁=2 (oxygen only)
• Final moles of gaseous products, n₂=1(X₃O₄)
  Hence, P2/P1=n₂T₂/n₁T₁=1×6002×300=1
  or P2:P1=1:2