1- Balance below chemical equations

Mg + HNO₃ Mg (NO₃)₂+ H₂

C₅H₁₂+ O₂ CO₂ + H₂O

2- Considering below reaction, in order to produce 6.8 moles of aluminum hydroxide, Al(OH)₃, how many moles of aluminum oxide, Al₂O₃are needed? (Hint: First you need to make sure the equation is balanced)

Al₂O₃+ H₂O Al(OH)₃

3- Consider the provided table of bond energies and for below reaction determine the heat of reaction then based on that, determine the reaction is endothermic or exothermic? You should show your full calculation on bond energies and writing only one word of endothermic or exothermic will not be earned any points.

Bonds' Energies.jpg

4-Classify each of below process/reaction as endothermic or exothermic:

a) Evaporating liquid water

b) Candle burns (candle is the system)