### What mass of water can be heated

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Suppose that coal of density 1.5 g/cm3 is  pure carbon. (It is, in fact, much more com-  plicated, but this is a reasonable ?rst approximation.) The combustion of carbon is  described by the equation  C(s) + O2 (g) -→ CO2 (g) ?H  ?  = -394 kJ  What is the value of q (heat) when a lump  of coal of size 7.9 cm × 7.4 cm × 6.9 cm is  burned?  What mass of water can be heated from 16C to 100C by burning this piece of coal? Answer in units of g.

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