H 2 S(g)+ 3F 2 (g) ? SF 4 (g) + 2HF(g) When 20 L of ethane at STP is completely

Question

H2S(g)+ 3F2(g) ? SF4(g) + 2HF(g)

When 20 L of ethane at STP is completely combusted, what volume of O2 (g) is consumed in the reaction? A) 25 L
B) 70 L
C) 75 L
D) 88 L
E) 100 L
3. Which of the following statements regarding enthalpy are true?

I.   Enthalpy is an extensive property.
II.  The enthalpy change for a reaction is equal in magnitude but opposite in sign to the enthalpy change for the reverse reaction.
III. The enthalpy change for a reaction depends on the state of the reactants and products.
IV. Under constant pressure, the change in enthalpy of a system equals the amount of heat gained or lost by the surroundings.
V. Enthalpy is a state function.

A) All of the above are true.
B) I, II, III, and IV only
C) III, IV, and V only
D) II, III, IV, and V only
E) I, II, III, and V only
4. Given the following data:

(1) N2 (g) + O2 (g) ? 2NO (g)         ?H = +180.7 kJ
(2) 2NO (g) + O2 (g) ? 2NO2 (g)    ?H = 113.1 kJ
(3) 2N2O (g) ? 2N2 (g) + O2 (g)     ?H = 163.2 kJ

What is ?H for reaction (4)?

(4) N2O (g) + NO2 (g) ? 3NO (g)

A) 130.6 kJ
B) 155.7 kJ
C) 394 kJ
D) 155.7 kJ
E) Cannot be determined using the given data.
5. The following are average bond energies in kJ/mol:

SH 339 SS 266 SF 327 HF 567 HH 436 F2 155

Based on bond enthalpies above, what is ?H (in kJ/mol) for the following reaction?

H2S(g)+ 3F2(g) ? SF4(g) + 2HF(g)

[enter integer with the correct algebraic sign]
6. The value of ?H for the reaction below is 186 kJ.

H2(g) + Cl2(g) ? 2HCl(g)

What is the value of ?Hf for HCl(g)? A) 3.72 102 kJ/mol
B) 1.27 102 kJ/mol
C) 93.0 kJ/mol
D) 186 kJ/mol
E) +186 kJ/mol
7. When hydrogen sulfide gas is bubbled into a solution of sodium hydroxide, the reaction forms sodium sulfide and water. How many grams of sodium sulfide are formed if 2.00 g of hydrogen sulfide is bubbled into a solution containing 2.00 g of sodium hydroxide, assuming that the sodium sulfide is made in 92.0% yield? A) 1.95 g
B) 2.12 g
C) 2.30 g
D) 1.80 g
E) 1.65 g
8. Which is the limiting reagent when 0.5 moles of P4 and 0.5 moles of S8 react according to the following reaction?

4 P4 (s) + 5 S8 (s) ? 4 P4S10 (s)

A) P4
B) S8
C) There is not enough information.
D) Neither P4 nor S8.
E) Both P4 and S8.

Explanation / Answer

b) 70 L

3). A) All of the above are true.

4) D) 155.7 kJ

5) 1299 KJ

6) C)

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