This question is about some chemistry of nitrogen halides, phosphorus halides, and boron halides.
Nitrosyl chloride (NOClNOClNOCl) decomposes to form nitrogen monoxide and chlorine, as shown in Equilibrium 1.
NOCl(g)⇌NO(g)+12Cl2(g)ΔH=+76 kJ mol−1 NOCl(g) \rightleftharpoons NO(g) + \frac{1}{2}Cl_2(g) \quad \Delta H = +76 \text{ kJ mol}^{-1} NOCl(g)⇌NO(g)+21Cl2(g)ΔH=+76 kJ mol−12.40 moles2.40 \text{ moles}2.40 moles of NOCl NOCl\,NOCl is heated in a closed container in the presence of a catalyst and the resulting mixture is allowed to reach equilibrium. The equilibrium mixture contains 0.800 mol of NO NO\,NO and the total pressure of the system is 350 kPa.
Calculate the numerical value for Kp K_p\,Kp for Equilibrium 1 under these conditions and state the units of KpK_pKp. Give your answer to 3 significant figures.
Kp=K_p =Kp= ______________ units = ______________
The numerical values of Kp K_p\,Kp for Equilibrium 1 at temperatures T1 T_1\,T1 and T2 T_2\,T2 are shown below.
| Temperature | KpK_pKp |
|---|---|
| T1T_1T1 | 1.8 × 10-3 |
| T2T_2T2 | 5.2 × 10-1 |
Explain why T2 T_2\,T2 is a higher temperature than T1T_1T1.
Suggest how the value of Kp K_p\,Kp would change if the reaction was repeated with no catalyst added and the pressure of the system increased.
BCl3 BCl_3\,BCl3 and PCl3 PCl_3\,PCl3 both contain covalent bonds featuring chlorine.
Explain why the bond angles in BCl3 BCl_3\,BCl3 are 120∘120^\circ120∘.
Explain why both BCl3 BCl_3\,BCl3 and PCl3 PCl_3\,PCl3 have polar bonds, but only PCl3 PCl_3\,PCl3 has polar molecules.
