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Hess's Law

#### Q. ΔH for the reaction IF5(g) IF3(g) + F2(g) is ___ kJ given the data below

Solved • Jun 25, 2019

Hess's Law

#### Q. Coal gasification can be represented by the equation: 2C(s) + 2H2O(g) --> CH4(g) + CO2(g) ΔH = ? Use the following information to find ΔH for the reaction above.

Solved • Jun 22, 2019

Hess's Law

#### Q. use the thermochemical reactions given above (2.41.) to determine the enthalpy change for 2NO2(g) 2NO (g) + O2 (g)

Solved • Jun 19, 2019

Hess's Law

#### Q. NO(g) + O3(g) --> NO2(g) + (O2)g ΔH = -198.9 kJ/mol O3(g) --> 3/2 O2(g) ΔH = -142.3 kJ/mol O2(g) --> 2O(g) ΔH = +495 kJ/mol Use the thermochemical reactions given above to determine the enthalpy change for 2NO(g) + 4O(g) --> 2NO2(g) + O2(g)

Solved • Jun 19, 2019

Hess's Law

#### Q. Calculate the standard enthalpy change for the following reaction: 2Al(s) + 3Cl2(g) → 2AlCl3(s) ΔrHϴ = ? Use following thermochemical data in your calculation: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) ΔrHϴ = −1049 kJ HCl(g) → HCl(aq) ΔrHϴ = −74.8 kJ H2(g) + Cl2(g) → 2HCl(g) ΔrHϴ = −185 kJ AlCl3(s) → AlCl3(aq) ΔrHϴ = −323 kJ (A) −1826 kJ (B) −1451 kJ (C) −1502 kJ (D) −1407 kJ (E) −1884 kJ

Solved • Jun 19, 2019

Hess's Law

#### Q. Calculate ΔrH. for the reaction

Solved • Jun 18, 2019

Hess's Law

#### Q. Use Hess's law to predict the enthalpy change for the reaction; HCl(g) + NaNO2(s) ---> HNO2 + NaCl(s) using the following information: 1) 2NaCl + H2O --> 2 HCl + Na2O delta H= -507 kJ 2) NO + NO2 + Na2O --> 2 NaNO2 delta H= -427 kJ 3) NO + NO2 --> N2O + O2 delta H= -43 kJ 4) 2 HNO2 --> N2O + O2 + H2O delta H= 34 kJ

Solved • May 22, 2019