posted by karla .
in a vessel of 40 cm3 of water at 4 ° C is introduced aluminum over 80g to 8 º C. neglecting the effect of the vessel, calculate final temperature
"over 80g to 8º C" does not make sense.
Do you mean ".. is introduced 80 g of aluminum 80g at 8 ºC" ?
If so, equate the heat loss of the Al to the heat gain of the water, and solve for the unknown final T. You will need the specific heat of aluminum.