Answer to Question #212475 in Organic Chemistry for Meep

Question

Calcium carbide, CaC₂, is the raw material used for the production of acetylene

, C₂H₂ ,(used in welding torches). Calcium carbide is produced by reacting calcium oxide with carbon, producing carbon monoxide, CO as a byproduct. When one mole of calcium

carbide is formed, 464.8 kJ of heat is absorbed,

CaO_(s)+ 3C_(s) -> CaC_2(s)+ CO_(g) H = 464.8 kJ

a. What is the change in enthalpy when 1.00 g of calcium carbide is formed?

b. If the enthalpy change for the reaction is 246.7 kJ, what mass of calcium carbide is

produced?

c. What is the enthalpy change if 46.7 g of carbon reacts with excess calcium oxide?

d. How many grams of carbon are used up when 20.00 kJ of heat are absorbed?

e. How many gigajoules of energy is required to consume 1.38x10⁵g calcium oxide?

Answer 1

a) Change in Enthalpy=$464.8kJ$

b) The reaction is endothermic since 464.8kJ is absorbed in the formation of Calcium Carbide.

d) Grams of carbon used up=1.550g

e)Gigajoules of energy =7.26kJ