14) A sample of argon gas has a volume of 155 mL when the temperature is 37^oC. At what Celsius temperature will the volume of argon be 125 mL?

16) A sample of gas at a pressure of 0.850 atm has a volume of 675 mL. What will the volume be if the pressure is increased to 1.50 atm?

18)A 1.25 mol sample of nitrogen gas is in a 10.0 liter cylinder at 2.15 atmosphere of pressure. What is the temperature of the gas?

Problems: Show all of your work for the following problems, including unit conversions, for full credit. Pay attention to the significant digits and the units.

25) If it requires 2274 joules of energy to warm a 85.0- gram block of wood from 21.5^oC to 36.7^oC, what is the specific heat of wood?

29) Examine this reaction: H₂ + I₂ + 50.2 kJ → 2HI 

This reaction is __________________.

 

a.endothermic, with a positive ΔH

b.endothermic, with a negative ΔH

c.exothermic, with a positive ΔH

d.exothermic, with a negative ΔH

e.none of the above

31) Examine this reaction: C (s) + 2 (g) → CO₂ (g) + 393 kJ

This reaction is __________________.

a.endothermic, with a positive ΔH

b.endothermic, with a negative ΔH

c.exothermic, with a positive ΔH

d.exothermic, with a negative ΔH

e.none of the above

33) Calculate the heat released when 65.5 grams of water is converted to steam at 100^oC. 

35) Examine this chemical reaction and answer the question that follows:

1. C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy
2. Which is larger, a) the energy needed to break the bonds in C₆H₁₂O₆ or b) the energy given off when new bonds in CO₂ and H₂O are formed? 
3. a.The energy needed to break the bonds in C₆H₁₂O₆ and O₂ is larger.
4. b. The energy given off when new bonds in CO₂ and H₂O are formed is larger.

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