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# You need your calculator and paper to write on PowerPoint PPT Presentation

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

You need your calculator and paper to write on

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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?

ΔHvap(water) = 40.7 kJ/mol

ΔHfus(water) = 6.01 kJ/mol

Freezing temperature of water = 0.06ºC

Boiling temperature of water = 99.4ºC

Approx 7 minutes

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.]

Approx 7 minutes

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?