[tickno]

hey guys i just got a homework question and revision for exam.
i need a bit of help

A 40.08 g bar of aluminium (which has a molar heat capacity of 24.03 J mol -1 K -1) is heated to 66.77 ºC and dropped into a calorimeter containing water (with a specific heat capacity of 4.180 J g -1 K -1) initially at 22.46 ºC. The final temperature of the water is 41.53 ºC. Calculate the mass of water (in g) in the calorimeter.


Atomic weight Al= 26.98 g mol -1



anyone know how to do this?

[sjb]

hey guys i just got a homework question and revision for exam.
i need a bit of help

A 40.08 g bar of aluminium (which has a molar heat capacity of 24.03 J mol -1 K -1) is heated to 66.77 ºC and dropped into a calorimeter containing water (with a specific heat capacity of 4.180 J g -1 K -1) initially at 22.46 ºC. The final temperature of the water is 41.53 ºC. Calculate the mass of water (in g) in the calorimeter.


Atomic weight Al= 26.98 g mol -1



anyone know how to do this?

How much heat energy did the bar of aluminium lose? So how much did the water gain?

[tickno]

well thats the thing.

you use q=mc delta t ...right?
 
but like whats change in T.

it says it was heated to that temperature....but it doesnt say what from....or am i looking at 66.77 down to 41.53? for the aluminium.

and 22.46 to 41.53 for the water?

[Borek]

66.77 down to 41.53? for the aluminium.

and 22.46 to 41.53 for the water?

Yes.