The combustion of a fuel has an  ΔH  =  -2220 kJ mol [sup]-1[/sup]



Which energy profile diagram best represents the energy changes that take place during this reaction?



[cmimg]0/2065739_Q4PRCYXB.png[/cmimg]

Which one of the following statements describes the reaction below



 4Al (s) + 3O[sub]2[/sub] (g)  → 2Al[sub]2[/sub]O[sub]3[/sub] (s) ∆H = -3351 kJ 

The value of ∆H for the reaction below is -126 kJ. 

How much energy (in kJ) is released when 2.00 mol of NaOH is formed in the following reaction: 

2Na[sub]2[/sub]O[sub]2[/sub] (s) + 2H[sub]2[/sub]O (l) → 4NaOH (s) + O[sub]2 [/sub](g)

The specific heat capacity of lead is 0.13 Jg[sup]-1[/sup]K[sup]-1[/sup]. How much heat (in J) is required approximately to raise the temperature of 15 g of lead from 22[sup]o[/sup]C to 37[sup]o[/sup]C?

Given the following 2 reactions



Fe[sub]2[/sub]O[sub]3[/sub] (s) + 3CO (s) →  2Fe (s) + 3CO[sub]2[/sub] (g) ∆H = -28.0 kJ



3Fe (s) + 4CO[sub]2[/sub] (s)  → 4CO (g) + Fe[sub]3[/sub]O[sub]4[/sub] (s) ∆H = +12.5 kJ 



Work out the enthalpy change in the following  reaction: 



3Fe[sub]2[/sub]O[sub]3[/sub] (s) + CO (g)  → CO[sub]2[/sub] (g) + 2Fe[sub]3[/sub]O[sub]4[/sub] (s)