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  1. How much energy is released when 6 moles of octane is burnt in air
  2. Which of the following is a buffer solution?
  3. The number of valence electrons in 4.2g of N³⁻ ion is
  4. Heat of combustion ΔH for C(s) , H₂(g)and CH₄(g) are -94, -68 and -213 kcal/mol.
  5. 40 mL of 0.1 M ammonia solution is mixed with 20 mL of 0.1 M HCl.