Calcium carbide, CaC2, is the raw material for the production of acetylene (used in weld...

Calcium carbide, CaC₂, is the raw material for the production of acetylene (used in welding torches). Calcium carbide is produced by reacting calcium oxide with carbon, producing carbon monoxide as a byproduct. When one mole of calcium carbide is formed, 464.8 kJ are absorbed.

(a) Write a thermochemical equation for this reaction.

(b) Is the reaction exothermic or endothermic?

(c) Draw an energy diagram showing the path of this reaction. (Figure 8.4 is an example of such an energy diagram.)

(d) What is ΔH when 1.00 g of CaC₂(g) is formed?

(e) How many grams of carbon are used up when 20.00 kJ of heat are absorbed?

Reference Figure 8.4: