Question

Qu 20 C, and 500 estion H) Frito, wearing an enigmatic smile, seals 20g of steam at 120°C, 100g of ice at g of liquid water at 50°C inside an insulated box. Eventually, equilibrium is at is the temperature in the box at, that point?

Answer 1

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Let �t� be the final temperature. Energy released by 20 g of steam in 20 times (120 - 100) + 540 times 20(content heat) + (100 - t) = 400 + 10800 + 2000 - 20t = 13200 - 20t Heat absorved by 100 g of ice in = 100 times 20 + 100 times 80 + 100t = 2000 + 8000 + 100t = 10000 + 100t Heat absorved by 500 g liquid in = 500 times (t - 50) therefore Total heat must be zero. Therefore 13200 - 20t - [10000 + 100t] - [500(t - 50)] = 0 implies 13200 - 20t - 10000 - 100t - 500t + 25000 = 0 implies 28200 - 620 t = 0 implies 620t = 28200 t = 45.48 degree C therefore Final temperature 45.48 degree C.