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 first ap- proximation.) 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 8.6 cm×8.1 cm×7.6 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?