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Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more complicated, but this is a reasonable first approximation.) The combustion of carbon is described by the equation C(s) + O2(g) --> CO2(g) Delta H? = -394 kJ What is the value of q (heat) when a lump of coal of size 6 cm×5.5 cm×5 cm is burned? Answer in units of kJ. What mass of water can be heated from 15?C to 100?C by burning this piece of coal? Answer in units of g.

 

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