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38 solutions

Thermochemical Equation

Q. The heat of combustion of methane (CH4) is-890 kJ/mol. Determine the mass of methane (in g) that has to be burnt in order to heat 500 mL of water from 20 degrees Celsius to boiling. Assume all the heat release was used to heat the water.

Solved • Aug 15, 2019

Thermochemical Equation

Q. Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2 H2O2(l) → 2 H2O(l) + O2(g) ΔH = -196 kJ Calculate the value of q (kJ) in this exothermic reaction when 4.60 g of hydrogen peroxide decomposes at constant pressure.

Solved • Jul 26, 2019

Thermochemical Equation

Q. sing the following equation for the combustion of octane, calculate the heat associated with the combustion of excess octane with 100.0 g of oxygen assuming complete combustion. The molar mass of octane is 114.33 g/mole. The molar mass of oxygen is 31.9988 g/mole. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O ΔH°rxn = -11018 kJ

Solved • Jul 25, 2019

Thermochemical Equation

Q. Industrial production of nitric acid, which is used in many products including fertilizers and explosives, approaches 10 billion kg per year worldwide. The first step in its production is the exothermic oxidation of ammonia, represented by the following equation. 4 NH3(g) + 5 O2(g) -> 4 NO(g) + 6 H2O(g) ΔH°rxn = -902.0 kJ If this reaction is carried out using 7.126 x 10^3 g NH3 as the limiting reactant, what is the change in enthalpy?

Solved • Jul 18, 2019

Thermochemical Equation

Q. The decomposition of hydrogen peroxide, H202, has been used to provide thrust in the control jets of various space vehicles. Using the Supplemental Data, determine how much heat (in kJ) is produced by the decomposition of 1.62 mol of H202 under standard conditions. 2 H202(/) -" 2 H20(g) + 02(g) t kJ

Solved • Jul 18, 2019

Thermochemical Equation

Q. Before the introduction of chlorofluorocarbons, sulfur dioxide (enthalpy of vaporization, 5.96 kcal/mol) was used in household refrigerators. What mass (in kg) of SO2 must be evaporated to remove as much heat as evaporation of 1.87 kg of CCI2F2 (enthalpy of vaporization is 20.1 16/mol)?

Solved • Jul 18, 2019

Thermochemical Equation

Q. How should 2 heats of reaction for the neutralization of NaOH and the 2 acids (HCl and HC2H3O2) compare? why?

Solved • Jun 30, 2019