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You need your calculator and paper to write on. You will need the chart on page 2 for one of the problems. How many joules of energy is required to change 50mL of liquid water at 85ºC to steam at 115ºC? Some helpful information: ΔH vap (water ) = 40.7 kJ/mol

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You need your calculator and paper to write on

You need your calculator and paper to write on

You will need the chart on page 2 for one of the problems.


You need your calculator and paper to write on

How many joules of energy is required to change 50mL of liquid water at 85ºC to steam at 115ºC?

Some helpful information:

ΔHvap(water) = 40.7 kJ/mol

ΔHfus(water) = 6.01 kJ/mol

Freezing temperature of water = 0.06ºC

Boiling temperature of water = 99.4ºC

Answer: 117,000

Approx 7 minutes


You need your calculator and paper to write on

An 8.50-gram sample of an unknown metal at 118ºC is placed into a coffee-cup calorimeter containing 35.0 mL of water. The water’s temperature increased from 35.000ºC to 36.793ºC. What is the identity of the metal? [You will need to use your packet chart.]

Answer: Brass

Approx 7 minutes


You need your calculator and paper to write on

A 3-gram sample of heptane, C7H16, is combusted with 1,050 mL of oxygen gas at STP.

ΔH = - 4819 J/mol rxn.

  • Write the balanced reaction.

  • How much energy will be produced?

  • The energy is used to heat 90 grams of water originally at 17°C. What is the final temperature of the water?

    Answers:

    2) -20.5 J

    3) 17.05°C

    When you finish, get your packet out and work some extra problems!!! No sitting around!

Approx 15 minutes


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