Chemistry, 04.02.2020 11:54 tamikeen2243
To a sample of water at 23.4oc in a constant pressure calorimeter of negligible heat capacity is added a 12.1 g piece of aluminium whose temperature is 81.7oc. if the final temperature of water is 24.9 oc, calculate the mass of the water in the calorimeter. ans: 98.6g
-i know that the specific heat of aluminum is 0.900 j/g ‡ ác
- _t al is 24.9ác _ 81.7ác = _56.8ác
- _twater and _tcalorimeter are both 24.9ác _ 23.4ác = 1.5ác.
-the specific heat of water is 4.184 j/g ‡ ác.
but i tried using m=q/s_t. i'm really stuck, can anyone me?
Answers: 1
![-m_1\times c_1\times (T_{final}-T_1)=[m_2\times c_2\times (T_{final}-T_2)]](/tpl/images/0500/2981/27fc4.png)
.................(1)
= mass of aluminium = 12.1 g
= mass of water = ?
= final temperature = 
= temperature of aluminium = 
= temperature of water = 
= specific heat of aluminium = 
= specific heat of water= 
![-12.1\times 0.900\times (24.9-81.7)=-[m_2\times 4.184\times (24.9-23.4)]](/tpl/images/0500/2981/9ba9b.png)
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