How much ice must be added to 100g water at 30°C in order to reduce it's temperature to 20°C?A. 10gB. 400gC. 80gD. None of these

How much ice must be added to 100g water at 30°C in order to reduce i

1.	How much ice must be added to 100g water at 30°C in order to reduce it's temperature to 20°C?A. 10gB. 400gC. 80gD. None of these
Answer» There are TWO heats involved: the HEAT to MELT the ice and the heat to cool the water. Heat to melt the ice + Heat to cool the water = 0. q1+q2 = 0 mΔHfus+mcΔT = 0 m × 333.55 J·g⁻¹ + 254 g × 4.184 J·g⁻¹°C⁻¹ × (-25.0 °C) = 0 333.55 m g⁻¹- 26 600 = 0 m=26600333.55g⁻¹ = 79.7 g=80g your option is C.80

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How much ice must be added to 100g water at 30°C in order to reduce it's temperature to 20°C?A. 10gB. 400gC. 80gD. None of these

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