Question

Given the standard enthalpy changes for the following two reactions:

(1) \(2 \mathrm{C}(\mathrm{s})+2 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow \mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{~g}) \quad \Delta \mathrm{H}^{\circ}=\mathbf{5 2 . 3} \mathrm{kJ}\)

(2) \(2 \mathbf{C}(\mathbf{s})+\mathbf{3 H}_{\mathbf{2}}(\mathbf{g}) \longrightarrow \mathbf{C}_{\mathbf{2}} \mathbf{H}_{\mathbf{6}}(\mathbf{g}) \quad \Delta \mathrm{H}^{\circ}=-\mathbf{8 4 . 7} \mathrm{kJ}\)

what is the standard enthalpy change for the reaction:

(3) \(\mathbf{C}_{\mathbf{2}} \mathbf{H}_{\mathbf{4}}(\mathbf{g})+\mathbf{H}_{\mathbf{2}}(\mathbf{g}) \longrightarrow \mathbf{C}_{\mathbf{2}} \mathbf{H}_{\mathbf{6}}(\mathbf{g}) \quad \Delta \mathrm{H}^{\circ}=?\)

Given the standard enthalpy changes for the following two reactions:

(1) \(\mathrm{N}_{2}(\mathrm{~g})+2 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NO}_{2}(\mathrm{~g}) \quad \Delta \mathrm{H}^{\circ}=66.4 \mathrm{~kJ}\)

(2) \(2 \mathbf{N}_{2} \mathrm{O}(\mathrm{g}) \longrightarrow \mathbf{2 N}_{2}(\mathbf{g})+\mathbf{O}_{2}(\mathrm{~g}) \quad \Delta \mathrm{H}^{\circ}=-\mathbf{1 6 4 . 2} \mathrm{kJ}\)

what is the standard enthalpy change for the reaction:

(3) \(2 \mathbf{N}_{\mathbf{2}} \mathbf{O}(\mathbf{g})+\mathbf{3 O}_{\mathbf{2}}(\mathrm{g}) \longrightarrow \mathbf{4} \mathbf{N O}_{\mathbf{2}}(\mathrm{g}) \quad \Delta \mathrm{H}^{\circ}=?\)

Answer 1

(۵) - 2 + (یع 2 - (9) D C2H (ن) والا - (3) ,2 + ( و تا 31 - = "طد (9) و د رو) وط+ (9) وطح ) او مرد) و 2 + (1 د 2012 (2) . 32 - اد - - - - - راد رو رها و رو) دہ ہو + رق) ولم 2 (3) .) + (4) 2 ( رو)0 ,27 د °2ل» با ا . 2 . =ط 20 + 0 ولم 2