Question

Write a balanced formation equation at standard conditions for the compound HCN.

Answer 1

Explanation:

HCN = Hydrogen cyanide

In standard conditions, the chemical equation of formation of hydrogen cyanide from, hydrogen gas, carbon and nitrogen gas.

The balanced chemical reaction is given as:

$H_2(g)+2C(s)+N_2(g)\rightarrow 2HCN(g)$

According to stoichiometry, 1 mole of hydrogen gas , 2 moles of carbon atom and 1 mole of nitrogen gas combined together to form 2 moles of hydrogen cyanide gas.

Answer 2

The formation of hydrogen cyanide, HCN is formed by reacting hydrogen gas, carbon and nitrogen gas, expressed in the following expression below:

½ H2 (g) + C (s) + ½ N2 (g) → HCN (g) ΔHof = 135 kJ

At standard conditions, hydrogen and nitrogen exist as gases while carbon is solid. This is also an endothermic reaction due to the positive ΔHof