An unknown metal of mass 192 g heated to a temperature of 100 ° C was immersed into a brass calorimeter of mass 128 g containing 240 g of water at a temperature of 8.4 o C . Calculate the specific heat of the unknown metal if water temperature stabilizes at 21.5 o C . ( Specific heat of brass is 394 J k g - 1 K - 1 )

Question

An unknown metal of mass 192 g heated to a temperature of 100 ° C was immersed into a brass calorimeter of mass 128 g containing 240 g of water at a temperature of 8.4 o C . Calculate the specific heat of the unknown metal if water temperature stabilizes at 21.5 o C . ( Specific heat of brass is 394 J k g - 1 K - 1 ), 916 J k g - 1 K - 1, 458 J k g - 1 K - 1, 654 J k g - 1 K - 1, 1232 J k g - 1 K - 1

MARKS App · Accepted Answer

Conservation of energy: m s Δ T = m b s b + m w s w Δ T w 192 × 10 - 3 s 100 - 21.5 = 128 × 394 + 240 × 4182 × 10 - 3 × 21.5 - 8.4 s = 50432 + 1003680 13.1 15072 = 916 . 19 ≃ 916 J k g - 1 K - 1

Search any question & find its solution

Looking for more such questions to practice?