For which of the following reactions does the AH correspond to the standard enth

Question

For which of the following reactions does the AH correspond to the standard enthalpy of formation of N20(3)? 3. a) N2(g) + 1/2O2(g) N20(g) b) N2(g) + 0(g) N2O(g) c) 2 N(g) + O(g) N20(g) d) 2Ndg) + O2(g) 2N20(g) e) NO(g) + 1/2N2(g) NO(g) 4. According to the kinetic molecular theory of gases, pressure is due to: o) collisions of molecules e) repulsive forces between molecules a) collisions of molecules with each other b) repulsive forces of molecules d) attractive forces between molecules ith the container walls and the container walls Convert a pressure of 0.767 atm into units of pascals (Pa). a) 52,300 Pa b) 66,100 Pa o) 77,700 Pa d) 32,600 Pa of 0.980 atm. What is the work of the system in joules (J)? a)-551 b)-713 c)-632 d)-794 e)-389 A reaction is exothermic. Therefore: 5. e) 44,300 Pa s from an initial volume of 4.0 L to a final volume of 12.0 L against a constant pressure 7. a) the system gains heat energy and the products have less potential energy than the reactants b) the system gains heat energy and the products have more potential energy than the reactants c) t he system loses heat energy and the products have less potential energy than the reactants

Explanation / Answer

3)

for delta hf:

rule 1 : there must be 1 mol of product formed

rule 2: Reactant must be element in their standard state

a: correct

b: not correct

O is not standard state of oxygen. rule 2 fails

c: not correct

N is not standard state of Nitrogen. rule 2 fails

d: not correct

2 moles of product is formed. rule 1 fails

e: Not correct

NO is a compound and not an element. rule 2 fails

Answer: a

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