Question

3. A calorimeter contains 90.0 g of 18.00°C water. A 35.0 g brass coin is initially in a beaker of 96.00°C water. The coin is quickly moved into the calorimeter and the water warms to 19.25°C. a. For which substance was this process endothermic-water or brass? Explain your reason- ing b. Calculate the specific heat of brass. Show your work.

Answer 1

Amo Given cahrimebr Conkins 9eagal A 18-00 ader brakor od raze oin inilally ina 35. 96-000c wates 19.25%C The wader warms Galdx Specilie bat of aldx Heat lost by Gold = mass AT96.00c - 19.25 = 7675 c AT 76. 150c aald =Heat los - 35 (2666-25 A Hea Gained Water of 1wates xSpecie head of alater xaT =mass

19.252-18-D0 125 C = 25 °c .'. woler =7 Head Gained by 470. J Heal Gaincd =40.J Head togHeat nained -(2686.25 -410.7J 2686.25 Cgpld0-1352 J

Given 200-yie minute per Wlhere te 5o dv 200-4! dt v (200-4) H Sdv 00-t) dt 200 200 (0+)- 2 l0a V= 200 (7)- 2 (49) v 400-98 VE 1302 is

Mes oeter floy from tank 302 minates plese toke Tme,..
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