题目
已知(Br)_2((g))、(CO)((g))、(CO)_2((g))、(NO)((g))、(NO)_2((g))在室温下的Delta_(f)H_(m)^circ分别为30.91(kJ) cdot (mol)^-1、-110(kJ) cdot (mol)^-1、-394(kJ) cdot (mol)^-1、90.25(kJ) cdot (mol)^-1、33.1(kJ) cdot (mol)^-1。则它们室温下稳定性顺序正确的是()A. (CO)_2 > (CO) > (Br)_2 > (NO)_2 > (NO);B. (Br)_2 > (CO)_2 > (CO) > (NO)_2 > (NO);C. (CO)_2 > (CO) > (NO)_2 > (NO) > (Br)_2;D. (NO) > (NO)_2 > (Br)_2 > (CO) > (CO)_2;
已知$\text{Br}_2(\text{g})$、$\text{CO}(\text{g})$、$\text{CO}_2(\text{g})$、$\text{NO}(\text{g})$、$\text{NO}_2(\text{g})$在室温下的$\Delta_{f}H_{m}^{\circ}$分别为$30.91\text{kJ} \cdot \text{mol}^{-1}$、$-110\text{kJ} \cdot \text{mol}^{-1}$、$-394\text{kJ} \cdot \text{mol}^{-1}$、$90.25\text{kJ} \cdot \text{mol}^{-1}$、$33.1\text{kJ} \cdot \text{mol}^{-1}$。则它们室温下稳定性顺序正确的是() A. $\text{CO}_2 > \text{CO} > \text{Br}_2 > \text{NO}_2 > \text{NO}$; B. $\text{Br}_2 > \text{CO}_2 > \text{CO} > \text{NO}_2 > \text{NO}$; C. $\text{CO}_2 > \text{CO} > \text{NO}_2 > \text{NO} > \text{Br}_2$; D. $\text{NO} > \text{NO}_2 > \text{Br}_2 > \text{CO} > \text{CO}_2$;
题目解答
答案
根据题目给出的Δ_fH_m^θ值:
- CO₂:-394 kJ/mol(最稳定)
- CO:-110 kJ/mol
- Br₂:30.91 kJ/mol
- NO₂:33.1 kJ/mol
- NO:90.25 kJ/mol(最不稳定)
按Δ_fH_m^θ从小到大排序:
CO₂ < CO < Br₂ < NO₂ < NO
对应稳定性顺序为:
CO₂ > CO > Br₂ > NO₂ > NO
答案:A. CO₂ > CO > Br₂ > NO₂ > NO