Chloroform (CHCl3) is produced on large scales through the reaction between methane and chlorine gas. Hydrogen chloride gas is formed as a by-product. CH4(g) + 3Cl2(g) à 3HCl(g) + CHCl3(l)

a) Calculate the theoretical yield of chloroform (CHCl3) when 500 g of methane reacts with excess chlorine gas. Show working.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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