Friday

July 25, 2014

July 25, 2014

Posted by **Alyssa** on Sunday, October 27, 2013 at 2:48pm.

A 1.37-gram sample of compound X (of MW 88.0 g/mol) was burned in a bomb calorime- ter containing 1700 g of water. A temperature rise of 0.95◦C was observed. ∆Erxn for this re- action is −475 kJ/mol of X. What is the heat capacity of the calorimeter hardware (not the water)?

Answer in units of J/◦C

PART 2

What is the water equivalent of the calorime- ter hardware in the previous question?

Answer in units of grams

- AP chemistry -
**DrBob222**, Sunday, October 27, 2013 at 9:53pm475,000*(1.36/88.0) = [mass H2O x specific heat H2O x delta T] + [Ccal*0.95]

Substitute and solve for Ccal.

Water equivalent of calorimeter is mass H2O that equals heat capacity of the calorimeter.

Ccal = mass H2O x specific heat H2O.

Solve for mass H2O.

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