# Chemistry

posted by S

High quality coal (anthracite) is almost pure carbon. The combustion of carbon to carbon dioxide
releases 393 kJ per mol of carbon burnt. If 1.000 kg of anthracite is burnt:
(i) How much heat is released?
(ii) How much ice (in kg) at 273 K could be melted to give water at 273 K using the heat in (i)? (iii)How much ice at 273 K could be melted to give water at 100 °C using the heat in (i)?
(iv) How much ice at 273 K could be melted to give steam at 373 K using the heat in (i)?

1. DrBob222

C + O2 ==> CO2 +393 kJ/mol = 393 kJ/12 g C.
1. So 393 kJ x (1,000 g/12 g) = ? = approx 33,000 kJ but that's just an estimate.
2. How much heat is required to melt 1 g ice. That's approx 334 J/g ice but you need to use the value in your text/tables. You have about 33,000 kJ. How much ice can you melt with that.
3 & 4. Same thing as 2 but the ice, after metling must raise the T from the melted ice at zero C to 100 C. In 4 you must add enough to raise change the phase from liquid to steam.
Post your work if you need more help.

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