Chemistry 9701 · AS & A Level · Nitrogen and sulfur

Nitrogen and sulfur — practice question

Carbon disulfide, $\text{CS}_2$, is a flammable, volatile liquid that is formed in small amounts in volcanoes.
(a(i))

Draw a dot-and-cross diagram for the carbon disulfide molecule, showing only the outer electrons.

(a(ii))[3]

Suggest the shape of the molecule, and state the bond angle.

(b(i))

Construct the balanced equation for the complete combustion of $\text{CS}_2$.

(b(ii))[3]

Define standard enthalpy change of combustion, $\Delta H_c^\circ$.

(c)[3]

Calculate the standard enthalpy change of formation of $\text{CS}_2$ using the data below. Include a sign in your answer. Standard enthalpy change of combustion of $\text{CS}_2$ $= -1110\ \text{kJ mol}^{-1}$. Standard enthalpy change of formation of $\text{CO}_2$ $= -395\ \text{kJ mol}^{-1}$. Standard enthalpy change of formation of $\text{SO}_2$ $= -298\ \text{kJ mol}^{-1}$.

(d(i))

Construct a balanced equation for the reaction of carbon disulfide with nitrogen monoxide, $\text{NO}$, when they react in a $1:2$ molar ratio to form a yellow solid and two colourless gases.

(d(ii))[3]

What is the change in sulfur's oxidation number in this reaction? From \_\_\_\_ to \_\_\_.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: Sulfur atom has 6 electrons, whereas carbon atom has 4 electrons

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