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The figure below is a heat curve for an unknown outerspace substance discovered by the Mars rover. By understanding the heat curve, scientists can make inferences about the composition of the planet.

What is the temperature of fusion, Tfusion, and vaporization, Tvapor, for this unknown substance?

Y intercept is Temperature (C)
X intercept is Time
Start at (0,-60C)
then (20,80C) to (50,80C)
increase to (100,280C) to (140,280C)
increase to (160,360C)

For a sample of 67.4 g of this substance with a specific heat of 49.9 J/kg·C, how much heat is added to the substance if the temperature is to change from 180.0C to 250.0C?
Q= ? J

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