El amoníaco y el ácido sulfúrico reaccionan para producir azufre, ácido nítrico y agua.
Se mezclan 400 mL de amoníaco gaseoso medido a 27
°C y 730 mm Hg con 1.0 mL de ácido sulfúrico
concentrado cuya densidad es 1.85 g/cm3.
Al finalizar el proceso se obtuvieron 0.55 gramos de
azufre. ¿Cuál es el rendimiento de este proceso?

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not clear

when the pressure is increased, there will be a shift to the reactants side. decreasing the volume will increase pressure. when you decrease the volume, the gaseous species get more tightly packed of the concentrations of gaseous species increase.

le chatelier's principle says that the system wants to undo this concentration increase so it can decrease pressure.

since the reactants only have 1 mol of gas (only pcl5) and the products have 2 mol of gas (both pcl3 and cl2), it shifts to reactants to decrease concentration, thereby lowering the pressure