The most common form of elemental sulfur is Sg, in which eight sulfur atoms linked in a ring of single bonds. At high temperature, in the gas phase, Sg can break apart to give S₂, the sulfur analog of molecular oxygen: Sg(g) 4S₂(g) AH = +239 kJ at T = 800 K

Calculate ΔH° for the following reaction.   CH4(g)+2O2(g)--> CO2(g)+2H2O(g)   Use standard heats of formation from tables i provided below. not all are included.

Please report in correct sigfigs and in units of kJ/mol

Consider the following reaction under standard conditions, in which DHo and DSo are given.             CO(g)  +  2H2(g)  -->  CH3OH(g);          DHo = -90.5 kJ, and DSo = -219.2 J/K What is DGo if the reaction is carried out at 250oC under standard conditions? Is the reaction spontaneous under this condition?      (A) DGo = -35.7 kJ; the reaction is spontaneous     (B) DGo = 145.3 kJ; the reaction is not spontaneous     (C) DGo = -205.1 kJ; the reaction is spontaneous     (D) DGo = 24.1 kJ; the reaction is not spontaneous

Calculate ΔHf for HCN(g) at 25°C, given the following related reaction at 25°C, 2 NH3(g) + 3 O2(g) + 2 CH4(g) ---> 2 HCN(g) + 6 H2O(g); ΔHrxn = -870.8 kJ and the heats of formation of some species are ΔHf = -80.3 kJ/mol for NH3(g), -74.6 kJ/mol for CH4, and -241.8 kJ/mol for H2O(g). Answers are in kJ/mol.

Balance the following equation and calculate its ΔSo in units of J mol-1 K-1.   Fe(s) + H2O(l) → Fe3O4(s) + H2(g)   Fe(s) - 27.3 J mol-1 K-1 H2O (l) - 70 J mol-1 K-1 Fe3O4 (s) - 146.4 J mol-1 K-1 H2 (g) - 130.7 J mol-1 K-1

A 0.588 g sample of liquid C5H12 was combusted using excess oxygen gas inside a bomb calorimeter, with the products being carbon dioxide gas and liquid water. The calorimeter's heat capacity is 4.706 kJ °C-1. If the temperature inside the calorimeter increased from 25.0 °C to 29.9 °C, determine ΔrU for this reaction in kJ mol-1 (with respect to C5H12). Do not worry about how realistic the final answer is. Express answer in 2 significant figures.

Consider the following reaction: Sr(OH)2(s) → Sr2+(aq) + 2 OH-(aq)     ΔHorxn = -19.3 kJ/ mol Sorxn = -218.3 J/ K mol Which of the following statements is true? Group of answer choices: - the reaction is always non-spontaneous - The reaction is nonspontaneous at all temperatures - The reaction is spontaneous only at high temperature - The reaction is spontaneous only at low temperature - ΔG < 0 and the reaction is always spontaneous