Question

NO₂ required for a reaction is produced by the decomposition of N₂O₅ in CCl₄ as per the
equation 2N₂O₅ (g) → 4NO₂ (g) + O₂ (g) The initial concentration of N2O5 is 3.00 mol L⁻¹ and it is 2.75 mol L⁻¹ after 30 minutes. The rate of formation of NO₂ is :
(A) 1.667 × 10⁻² mol L⁻¹ min⁻¹
(B) 4.167 × 10⁻³ mol L⁻¹ min⁻¹
(C) 8.333 × 10⁻³ mol L⁻¹ min⁻¹
(D) 2.083 × 10⁻³ mol L⁻¹ min⁻¹

Answer 1

Explanation:

(C) 8.333 × 10⁻³ mol L⁻¹ min⁻¹

the correct answers is this

Answer 2

a*b = -100

given a = 12

12*b = -100

b = -100/12

= -8.333