Wednesday, September 28, 2016

A thermos bottle contains 0.150 kg of water at 4.1 degrees celsius. When 9 x 10^-2 kg of a metal, initially at 96.2 degrees celsius, is put into...

The amount of thermal energy gained or lost is calculated as:


thermal energy gained or lost = mass of substance x specific heat x change in temperature.


In this case, the temperature of water has increased and it has gained some thermal energy. This amount of thermal energy can be calculated as:


Thermal energy gained by water = mass of water x specific heat of water x (final temperature - initial temperature)


= 0.15 kg x 4186 J/kg/K x (21.7 - 4.1) C = 11,051.04 J


The gain in thermal energy of the water is due to thermal energy loss by the metal, which can be written as:


thermal energy lost by metal = 9 x 10^-2 x C x (96.2 - 21.7)


where C is the specific heat of the metal in J/kg/K.


Assuming no heat loss,


thermal energy lost by metal = thermal energy gained by water


or, 9 x 10^-2 x C x (96.2 - 21.7) = 11,051.04


solving the equation, we get, C = 1648.2 J/kg/K or 1.648 J/g/K

1 comment:

  1. I wanted to thank you for this excellent read!! I definitely loved every little bit of it. I have you bookmarked your site to check out the new stuff you post. Designa egna produkter

    ReplyDelete

Thomas Jefferson's election in 1800 is sometimes called the Revolution of 1800. Why could it be described in this way?

Thomas Jefferson’s election in 1800 can be called the “Revolution of 1800” because it was the first time in America’s short history that pow...