A 36.5-g glass thermometer reads 21.6?C before it is placed in 137mL of water. W

Question

A 36.5-g glass thermometer reads 21.6?C before it is placed in 137mL of water. When the water and thermometer come to equilibrium, the thermometer reads 41.8?C. Ignore the mass of fluid inside the glass thermometer. The value of specific heat for water is 4186 J/kg?C?, and for glass is 840 J/kg?C?.

A 36.5-g glass thermometer reads 21.6?C before it is placed in 137mL of water. When the water and thermometer come to equilibrium, the thermometer reads 41.8?C. Ignore the mass of fluid inside the glass thermometer. The value of specific heat for water is 4186 J/kg?C?, and for glass is 840 J/kg?C?.

Explanation / Answer

36.5-g glass thermometer reads 21.6?C

Q=0.0365*(41.8-21.6)*840=619.332 J for glass

This is from water

m*c*delta T=619.332

delta T=619.332/0.137*4186=1.07

T original=41.8+1.07=42.87 deg celsius

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