HEAT-1 EXPERIMENT A An aluminum calorimeter with water is used to determine spec

Question

HEAT-1

EXPERIMENT A

An aluminum calorimeter with water is used to determine specific heat of US pennies. Pennies are heated to BP water, and placed in calorimeter.

CALORIMETER

Aluminum cup: 500 g

Water: 200 mL

Initial temperature: 19 C

PENNIES

Handful of Cu pennies: 2.5 g each

Initial temperature: 100 C

FINAL SYSTEM: CALORIMETER+ PENNIES

Final temperature: 23.05 C

There are _____ 1 pennies.

EXPERIMENT B

4.4 kg of steam at 100 C is injected into a container with a 1 cf (0.03m3) block of ice at 0 C and produces water. The final water temperature is _____ 2 C .

Explanation / Answer

Experiment A)

Use equation,

Heat lost by (aluminum + water) = Heat gained by Cu pennies

macaT + mwcwT = n*mcccT

0.5*900*(23.05-19.0)+0.2*4190*(23.05-19.0) = n*0.0025*390*(100-23.05)

n=69.5 = 70 pennies

Experiment B)

Heat lost by steam = Heat gained by ice

mwLv + mwcwT = miLf + mwcwT

mi = 917*0.03 = 27.5 kg

4.4*2264500+4.4*4190*(Tf – 0) = 27.5*334000 + 27.5*4190**(Tf – 0) => Tf = 8.05 C

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