What is the final temperature when 20.0 g of water at 25 c is mixed with 30.0 g of water at 80 c

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A)A 50.0 g sample of liquid water at 25.0 °C is mixed with 17.0 g of water at 83.0 °C. The final temperature of the water is ________°C. B)The specific heat capacity of liquid mercury is 0.14 J g-1 K-1. How many joules of heat are needed to raise the temperature of 4.00 g of mercury from 19.0°C to 39.5°C?