Question 1.

A cube of ice is taken from the freezer at -6.5 CC and placed in a 95-gg aluminum calorimeter filled with 300 gg of water at room temperature of 20.0 CC. The final situation is observed to be all water at 15.0 CC. The specific heat of ice is 2100 J/kgCJ/kgC, the specific heat of aluminum is 900 J/kgCJ/kgC, the specific heat of water is is 4186 J/kgCJ/kgC, the heat of fusion of water is 333 kJ/KgkJ/Kg.

What was the mass of the ice cube?

Question 2.

The value of specific heat for copper is 390 J/kgCJ/kgC, for aluminun is 900 J/kgCJ/kgC, and for water is 4186 J/kgCJ/kgC.

What will be the equilibrium temperature when a 235 gg block of copper at 235 CC is placed in a 155 gg aluminum calorimeter cup containing 855 gg of water at 13.0 CC?

Question 3.

Part 1.

Calculate the rms speed of an oxygen molecule at 6 C.

Part 2.

Determine how many times per second each molecule moving with rms speed would move back and forth across a 6.4 mm -long room on the average, assuming it made very few collisions with other molecules. To find vx use the equation v2=v2x+v2y+v2z2=2+2+2 and the fact that molecules have no preferred direction.