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You decide to make a cup of coffee and put in your new pewter mug, with a mass of 150g. You use 350 g of water at 85 °C. This is too hot to drink. How many 32 g ice cubes @ 0 °C, do you need to add to your drink to bring it down to at least 55 °C. c_{\text {weter }}=4200 \mathrm{~J} \mathrm{~kg}^{-1}{ }^{\circ} \mathrm{C}^{-1}, c_{\text {pewefe }}=220 \mathrm{~J} \mathrm{~kg}^{-1}{ }^{\circ} \mathrm{C}^{-1}, L_{f}=3.33 \times 10^{5} \mathrm{Jkg}^{-1} Assume that the pewter mug is the same temperature as the water.

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