# Homework Help: Heat Capacity, unknown metal

1. Apr 14, 2010

### e.hill792

1. The problem statement, all variables and given/known data
Find the quantity of thermal energy absorbed but the water in the calorimeter.
Mass of metal sample:69.64g
Water sample: Volume 190mL
Temp: 24'C
boiling water: 275mL
temp of boiling water:90'C
Sample in Calorimeter
Initial Heat: 25'C
30 seconds: 26'C
60 seconds 26'C
90 seconds 26'C
120 seconds 26'C
2nd Trial
Mass of metal sample:69.64g
Water sample: Volume 170mL
Temp: 26'C
boiling water: 275mL
temp of boiling water:98'C
Sample in Calorimeter
Initial Heat: 31'C
30 seconds: 29'C
60 seconds 29'C
90 seconds 28'C
120 seconds 28'C
2. Relevant equations
(m_H2O)(c_H2O)(deltaT_H2O)=-(m_metal)(c_metal)(deltaT_metal)

3. The attempt at a solution
(190)(4.18)(-66)=(69.64)(c_metal)(-3)
______________ =250.89 c_metal
(69.64)(-3)

(170)(4.18)(-69)=(69.64)(c_metal)(1)
______________= 704.06
(69.64)(1)

I know the sample is tin because the metal was labeled "Sn" even though the point of the lab was to "identify" an unknown metal.

Last edited: Apr 14, 2010