timer Asked: Apr 22nd, 2015

Question description

1,Determine whether it is BACKWARD, FORWARD , NONE OR BOTH

A piece of paper at room temperature reacts with oxygen to give carbon dioxide and water. 
Your food gets cold if you're late for supper. 
 Water freezes at -10°C and 1 atm. 
Vodka at room temperature separates into two phases - water and alcohol. 

2,Use Hess's law to calculate the enthalpy change for the reaction:5C(s) + 6H2(g) → C5H12(l)Given the following thermochemical equations:

C5H12(l) + 8O2(g) → 5CO2(g) + 6H2O(l) ΔH = -3509.0 kJ/mol 

C(s) + O2(g) → CO2(g) ΔH = -393.51 kJ/mol

H2(g) + ½O2(g) → H2O(l) ΔH = -285.83 kJ/mol

3,3C(s) + 4H2(g) + 5O2(g) ---> 3CO2(g) + 4H2O(l) ΔH= -2323.7 kJ/mol
How much heat would be released when 34.1 g of O2 react? 

4,,For each of the following statements label true or false. 
When ∆ H is positive, energy should be written on the reactant side of a reaction. 
The reaction will be exothermic when the energy is a product of a reaction. 
When energy is a product during a chemical reaction, the reaction vessel will feel warm to the touch. 
The ∆ H of a physical change will be 10 to 100s of times that of a chemical change. 
When ∆ H is positive, the reaction will be endothermic. 
 When a reaction has a negative ∆ H, the reaction vessel will feel warm to the touch. 

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