A granite rock (Cgranite = 0.744 J g-1 k-1) was throughly heated in a campfire to 450°C then dropped in 1.5L of water for washing the dishes (Twater = 24°C). Once thermal equilibrium was reached, the final temperature of the rock and water was 65.8°C. Assuming no loss of heat to the surroundings, what was the mass of the rock? a) 1450g b) 997g c) 1640g d) 881g e) 688g

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