The first step in the preparation of lead from its ore (galena, PbS) consists of roasting the ore.  PbS (s) +  O2 (g)  SO2 (g) + PbO (s) Calculate the standard enthalpy change for this reaction using Hess' Law.

Q: c) Petroleum gas is a fuel that contains propane, C,H. Why does the following equation not represent…

A: Given: The reaction given does not represent a standard enthalpy change of combustion reaction.

Q: The thermite reaction, in which powdered aluminum reacts with iron oxide and yields aluminum oxide…

A: Thermite reaction is the reaction between a metal and a metal oxide. In this reaction, the metal…

Q: A scientist measures the standard enthalpy change for the following reaction to be -1142.2 kJ:…

A: Standard enthalpy of formation of H2S (g) = -20.1 kJ/molStandard enthalpy of formation of O2 (g) = 0…

Q: (b) (i) Acetylene, C2H2 is a colourless gas which is widely used as a fuel and a chemical building…

A: Given, ∆Hof of CO2 = - 393.5 KJ mol-1 ∆Hof of H2O = - 393.5 KJ mol-1 ∆Hof of C2H2 = - 393.5 KJ mol-1…

Q: Coal gasification converts coal into a combustible mixture of carbon monoxide and hydrogen, called…

A: The chemical reaction is, H2O(l) + C(s) → CO(g) + H2(g)  Calculate ∆H for this reaction ?

Q: .If a system does 84.0 kJ of work on its surroundings and releases 105 kJ of heat against a constant…

A: Given : Work done on surrounding by system = 84.0 KJ  And heat released = 105 KJ Since heat is being…

Q: Use standard enthalpies of formation to calculate AH°rxn for the following chemical reaction: 3NO2…

A: Given chemical equation : 3NO2(g) + H2O(l) -----> 2HNO3(aq) + NO(g) ΔHorxn can be calculated as :…

Q: the standard enthalpy of formation of HCl(aq)  is  kJ/mol.

A:

Q: Consider the following reaction equation of combustion of glucose, C6H12O6: a. Calculate the…

A: Mass of Glucose = 5.25 g C6H12O6 (s) + 6O2(g) ------> 6CO2(g) + 6H2O(g)

Q: Nitrogen and oxygen gas combine to form nitrogen dioxide according to the reaction N2(g) + 20s(g)…

A:

Q: Calcium reacts with HCl according to the following reaction: Ca(s) + 2HCl(aq) -> CaCl2(aq) + H2(g)…

A: Given: Mass of calcium is 2.5 g. qsoln is +487 J. Introduction: The enthalpy of the reaction is the…

Q: Use Hess’ Law in determining the change in enthalpy of the chemical reaction. Follow the steps that…

A: Given reactions are,

Q: A scientist measures the standard enthalpy change for the following reaction to be 7.8 kJ : Fe(s) +…

A: Consider the given information is as follows; Fes  +  2 HClaq   →   FeCl2s   +   H2g…

Q: A scientist measures the standard enthalpy change for the following reaction to be 80.6…

A: Given, Standard enthalpy change = 80.6kJ. The given reaction is

Q: In the early days of automobiles, illumination at night was provided by burning acetylene, C2H2.…

A:

Q: The hypothetical element X and an oxide of X undergo the following reactions with oxygen, with the…

A: According to Hess law the standard enthalpy of reaction is equal to the sum of enthalpies of…

Q: Consider the reaction for the formation of aluminum oxide from aluminum and oxygen. 4 Al(s) + 30,…

A:

Q: A scientist measures the standard enthalpy change for the following reaction to be -146.4 kJ:…

A: The standard enthalpy of formation of a compound is the enthalpy change that occurs when 1 mole of…

Q: Methanol is known to be the simplest alcohol, and is used as an antifreeze agent, a solvent, a fuel…

A:

Q: What two conditions must be met by a thermochemical equation so that its enthalpy change can be…

A: ∆Hf° is the sign of change in standard enthalpy of formation. Where , "∆" denotes change in enthalpy…

Q: A scientist measures the standard enthalpy change for the following reaction to be 11.0 kJ…

A: Given: Standard reaction enthalpy= 11.0 kJ

Q: Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and…

A: Recall the reactions for combustion and and their values for heat of combustion C4H4 + 5O2 → 4CO2 +…

Q: Using the standard enthalpies of formation listed in the accompanying table, calculate the standard…

A: The expression for the change in enthalpy is shown below: where; ∆Hproducts = change in enthalpy of…

Q: n an industrial process to produce ammonia (NH3); nitrogen, N2, reacts with hydrogen, H2, the…

A: i) Since nitrogen gas reacts with hydrogen gas to produce ammonia gas Hence the reaction will be…

Q: A scientist measures the standard enthalpy change for the following reaction to be -780.8 kJ :…

A: The difference between the change in enthalpy of products and the reactants  is known as change in…

Q: 2. To study the possible amount of energy generated by a person, the person can be roughly viewed as…

A:

Q: 1. The combustion of a sample of aluminium produces 0.25 mol of aluminium oxide and releases 419 kJ…

A: The combustion reaction of aluminum is given by: Als + 34O2g  → 12Al2O3s The enthalpy change in…

Q: An intermediate step in the industrial production of nitric acid involves the reaction of ammonia…

A: Before moving on with the problem, balancing the unbalanced equation is very important- The balance…

Q: Chlorine Tri fluoride is a toxic intensely reactive gas.  It was used in WWII to make incendiary…

A: It is an exothermic reaction having ∆H as negative value and 1196 kJ of heat is evolved.

Q: A scientist measures the standard enthalpy change for the following reaction to be 214.3 kJ :…

A: Based on this value and the standard enthalpies of formation for the other substances, the standard…

Q: 2NO(g) + 02(g)–2NO2(g) Based on this value and the standard enthalpies of formation for the other…

A: Given  2NO (g) + O2 (g) ---> 2 NO2 (g)  ∆H rxn = -112.0 KJ  ∆H°f (NO2) = ?

Q: A scientist measures the standard enthalpy change for the following reaction to be -56.0 kJ:…

A: Formation enthalpy of the reactants and products (except water)  is collected from internet,since…

Q: A scientist measures the standard enthalpy change for the following reaction to be -57.0 kJ:…

A: Given balanced chemical equation,  Ca(OH)2(aq) + 2 HCl(aq) → CaCl2(s) + 2 H2O(l) The enthalpy change…

Q: A scientist measures the standard enthalpy change for the following reaction to be 6.7 kJ : CO(g) +…

A:

Q: Which of the following reactions corresponds to the standard enthalpy of formation of methane CH4?…

A: Standard enthalpy of formation: When one mole of the substance is formed by its constituent elements…

Q: When 10.00 g of phosphorus is burned in O2( g) to form P4O10(s), enough heat is generated to raise…

A: Given; M = 10.0 g c = 4.2jgC ∆T = (38-18)oC

Q: The hypothetical element X and an oxide of X undergo the following reactions with oxygen, with the…

A: Answer: -150 KJ  Solution:

Q: 20 The Romans used calcium oxide, CaO, to produce a strong mortar to build stone structures. The CaO…

A:

Q: A scientist measures the standard enthalpy change for the following reaction to be 209.4 kJ : CHĄ(g)…

A: Given chemical equation: CH4g+H2Og→3H2g+COg

Q: The integrated circuits in your cell phone and computer are made from the semiconductor silicon. The…

A: The stepwise reactions for conversion of impure silicon to pure silicon is given below : SiO2(s)  +…

Q: What is the work done by a system when it absorbs 47 J of heat and gains 12 J of energy? How much…

A: Since you have posted multiple question , we will solve first one for you. To get the remaining…

Q: Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel. Part A Write a balanced…

A: Given: The blending of ethanol with gasoline is used as an automobile fuel. The combustion of…

Q: hydrogen sulfide gas, H2S(g)H2S(g), reacts with oxygen gas, O2(g)O2(g) , sulfur dioxide gas,…

A:

Q: Copper metal can be produced by heating copper(II) oxide and hydrogen gas. Another product of the…

A:

Q: A scientist measures the standard enthalpy change for the following reaction to be -48.4 kJ:…

A: Data taken using appendix are  standard enthalpy of formation of CaCl2(s) = -795.4 kJ/mol standard…

Q: Meals on wheels. Meals-ready-to-eat (MREs) are military meals that can be heated on a flameless…

A:

Q: A scientist measures the standard enthalpy change for the following reaction to be -876.3 kJ:…

A: Solution:- Balanced chemical reaction:- 2NH3(g) + 3N2O(g) → 4N2(g) + 3H2O(g) ∆Hf = -876.3 kJ…

Q: 4. Phosphorus burns spontaneously in air to produce tetraphosphorus decaoxide, P,O1,(s): 4 P(s) + 5…

A: Reaction:- 4P + 5O2 -----> P4O10

Q: A scientist measures the standard enthalpy change for the following reaction to be 79.4 kJ:…

A: Consider the given reaction is as follows;  NH4Cl(aq)   →      NH3(g)    +     HCl(aq)…