1. Other than the fact that it should be cheap, plentiful and easily accessible, state two essential characteristics for a useful energy source.2. Wood is essentially composed of cellulose, hemicelluloses, and lignin. Different types of wood have different calorific values but the average specific energy of wood is about 15 000 kJ kg-1. Good quality anthracite contains about 95% carbon and 3% hydrogen by mass. The standard...