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95 solutions

Thermochemical Equation

Q. Liquid water can be split into hydrogen gas and oxygen gas (∆H = 285.8 kJ/mol) by applying energy through an electric current. In this experiment, 13.31 kJ of energy are applied to 12.3 grams of water in a sealed reaction vessel whose volume is 4.56 L and whose temperature is 311.15 K. Note: At 311.15 K, the vapor pressure of water is 0.0654 atm. Determine the theoretical yield in moles of hydrogen gas & moles of oxygen gas. Was limiting reactant water or energy?

Solved • Apr 1, 2020

Thermochemical Equation

Q. The thermochemical equation below shows the decomposition of the mineral magnesite: MgCO3(s) => MgO(s) + CO2(g) ΔHrxn = 117.3 kJ What is ΔH when 5.35 mol of CO2 reacts with excess MgO? A. 314 kJ B. -628 kJ C. 628 kJ D. -314 kJ E. none of these is within 5% of the correct value

Solved • Mar 30, 2020

Thermochemical Equation

Q. When one mole of methane (CH4) is burned at constant pressure, 890 KJ of energy is released as heat. Calculate the ΔH for a process in which a 5.8 g sample of methane is burned at constant pressure.

Solved • Mar 30, 2020

Thermochemical Equation

Q. In a certain experiment, 0.7000 mol of hydrogen gas reacted with 0.7000 mol of solid iodine at a constant 1 atm pressure, producing 1.4000 mol of solid hydrogen iodide and absorbing 36.9 kJ of heat in the process. Write the thermochemical equation

Solved • Mar 14, 2020

Thermochemical Equation

Q. Calculate the change in enthalpy (Delta H rxn) per mole of reagent

Solved • Feb 8, 2020

Thermochemical Equation

Q. How much energy is required to vaporize 158 g of butane (C4H10) at its boiling point, if its Hvap is 24.3 kJ/mol? ( Group of answer choices 66.1 kJ 89.4 kJ 15.1 kJ 38.4 kJ 11.2 kJ

Solved • Jan 16, 2020

Thermochemical Equation

Q. Given the molar enthalpy, how many moles of Mg reacted?

Solved • Dec 29, 2019