ThermochemistryHard
Question
For the given reactions
SiO2 + 4HF → SiF4 + 2H2O, ᐃH = -10.17 kcal
SiO2 + 4HCl → SiCl4 + 2H2O, ᐃH = 36.7 kcal
In may be concluded that
SiO2 + 4HF → SiF4 + 2H2O, ᐃH = -10.17 kcal
SiO2 + 4HCl → SiCl4 + 2H2O, ᐃH = 36.7 kcal
In may be concluded that
Options
A.HF will attack SiO2 and HCl will not
B.HCl will attack SiO2 and HF will not
C.HF and HCl both attack SiO2
D.None attacks SiO2
Solution
ᐃG = ᐃH - T ᐃS = -ve
All exothermic reactions are spontaneous, hence HF will attack SiO2.
All exothermic reactions are spontaneous, hence HF will attack SiO2.
Create a free account to view solution
View Solution FreeMore Thermochemistry Questions
Standard molar enthalpy of formation of CO2 is equal to...ᐃHof of water is - 285.5 kJ mol-1. if enthalpy of neutralisation of monoacid strong base is - 57.3 kJ mol-1, Ȁ...The ᐃHfo for CO2(g), CO(g) and H2O(g) are - 395.5, - 110.5 and - 241.8 kJ mol-1 respectively. The standard enthalp...NH3(g) + 3Cl2(g) → NCl3(g) + 3HCl(g) ; ᐃH1N2(g) + 3H2(g) → 2NH3(g) ; ᐃH2H2(g) + Cl2(g) → 2...The standard enthalpy of formation (ᐃfHo) at 298 K for methane, CH4(g), is - 74.8 kJ mol–1. The additional infor...