Consider the reaction, C2H4(g) + H2(g) → C2H6(g), where ΔH = –137 kJ. How many kilojoules are released when 3.5 mol of C2H4 reacts? Choose the correct answer 2.0 × 103 kJ are released 570 kJ are released 137 kJ are released 480 kJ are released

Q: One tablespoon of cookie dough has a mass of 14.69 g. It is combusted in a calorimeter whose heat…

A: q = m. C. ∆T  q = heat in joules  m = mass in grams  ∆T = Tf - Ti = final temperature - initial…

Q: , how many grams of aluminum can form when 1000 kJ of heat is transferred?

A: Given:  ΔH = 1676 kJ/mol To find what does 1000 kJ of heat will be produced

Q: Silane, SiH4, burns according to the reaction, SiH4 + 2O2 → SiO2 + 2H2O, with ΔH° = –1429 kJ. How…

A: In the question, negative sign of ∆H° means energy is released during the burning of SiH4  You can…

Q: In the following reaction, how many moles of CH3OH are required to produce -9.671 x 103 kJ of heat?…

A:

Q: A chemist measures the energy change ΔH during the following reaction:…

A: The reaction is, C3H8 + 5O2 -----> 3CO2 + 4H2O ∆H = -2220 kJ Since the change in enthalpy is…

Q: Which of the following processes are exothermic, and which are endothermic? (a) frost forms on a car…

A: The given process is, frost forms on a car window in the winter. In the formation of frost on a car…

Q: When 1 mole of CH4(g) reacts with H2O(g) to form H2(g) and CO(g) according to the following…

A: Since,  1 mole of CH4(g) reacts with H2O(g) to form H2(g) and CO(g) 206 kJ of energy are absorbed.…

Q: In the following reaction, What quantity in moles of CH₃OH are required to give off 2526 kJ of heat?…

A: Given :-   2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g)  ∆H° = -1280. kJ  To be calculated :-…

Q: When carbon disulfide,CS2, forms from its elements, heat is absorbed. How much heat would be…

A: Enthalpy of formation of carbon disulphide = 89.3 kJ The formation of carbon disulphide is for 1…

Q: If 1452.8 kJ of energy are released when two moles of CH3OH are combusted, which of the following…

A: Given: Amount of energy released in the combustion of 2 moles of CH3OH = 1452.8 KJ. And mass of…

Q: The combustion of butane, C4H10, is given as: 2C4H10(g) + 1302(g) → 8CO2(g) + 10H20(1), AH° = -5314…

A:

Q: Iron converts to iron (iii) oxide in this reaction: 2 Fe (s) + 3 CO (g) -> Fe2O3 (s) + 3 CO2 (g)…

A:

Q: The major source of aluminum in the world is bauxite (mostly aluminum oxide). Its thermal…

A: Given reaction Al2O3(s) →∆2 Al(s)+ 32 O2 (g)            , ∆H= 1676 kJ Heat transfer = 1.000x103 KJ

Q: 2. In order to produce 972 kJ of heat, how many grams of H2 must react? 2 H2 (g) + 02 (g) → 2 H20…

A:

Q: The combustion of butane, C4H10, is given as: 2C4H10(g) + 1302(g) 8CO2(g) + 10H,O(I), AH° = -5314…

A: Given values -> 2C4H10+13O2-> 8CO2+10H2O ∆H°= -5314kj

Q: Calculate the amount of heat released by a given reaction, causing the temperature of 500 mL water…

A: Volume of water = 500 ml Density of water = 1 g/ml Change in temperature = 5.2 ℃  Specific Heat of…

Q: Meals-ready-to-eat (MRES) are military meals that can be heated on a flameless heater. The heat is…

A:

Q: The detonation of TNT (C-H;N;O6) is a unimolecular decomposition reaction, represented by the…

A: Answer: 4.052 × 103 kJ energy e is released if 325 g of carbon dioxide gas are formed.

Q: A chemist measures the energy change AH during the following reaction: 2 H,O(1) → 2 H2(9)+O2(g)…

A: Given: Mass of H2O = 82.4 g Molar mass of H2O = 18.01528 g/mol As enthalpy (ΔH) is positive. The…

Q: In the following reaction, What quantity in moles of CH;OH are required to give off 1501 kJ of heat?…

A:

Q: Which of the following processes is exothermic? A) rolling a ball up a hill B) boiling water in a…

A: In this question, we will Identify which process is exothermic.  How we can identify you can see…

Q: What is the change in enthalpy in kilojoules when 2.30 mol of Mg is completely reacted according to…

A: The change in enthalpy measures the amount of heat released or absorbed in a chemical reaction,…

Q: 8. How much heat, in kilojoules, is needed to produce 1850 grams of ammonia (NH3), according to the…

A: Formula used :- Number of moles(n) = given mass(w)/Molar mass (M)      n= w/M

Q: When carbon disulfide, CS2, forms from its elements, heat is absorbed.  How much heat would be…

A: Thermodynamics is the branch of chemistry that mainly deals with the heat transfer between system…

Q: 200.0 mL of 0.200 M HNO3 is added to 200.0 mL of 0.200 M KOH in a coffee cup calorimeter. The…

A: Concept - Reaction is in between HNO3 and KOH. these both are strong acid and strong base, so the…

Q: A chemist measures the energy change AH during the following reaction: C3H3(9)+502(9) 3…

A:

Q: The highly exothermic thermite reaction, in which aluminum reduces iron(ll) oxide to elemental iron,…

A: Heat released and absorbed in a chemical reaction is function of the numbe of moles of reactants…

Q: A chemist measures the energy change AH during the following reaction: 2 Fe,O3(s) → 4 FeO(s)+O2(g)…

A: Exothermic reaction: If the energy is released in the reaction. Endothermic reaction: If the energy…

Q: Consider the reaction B2H6(g) + 3 O2(g) → B2O3(s) + 3 H2O(g) ∆H = -2035 kJ How much heat is…

A: Using the concept of limiting reagent, we can easily find the number of moles of the reaction that…

Q: 1. The combustion of ethene, C2H4, is an exothermic reaction. Use the information below to determine…

A: Given, Chemical Reaction : C2H4 + 3 O2 ---> 2 CO2 + H2O  ∆H = -1390 KJ

Q: In the following reaction, how much heat (in kJ) is released when 5.81 moles of CH4 are burned? CH4…

A: The balanced Chemical equation is - CH4(g) + 2O2(g) -----> CO2(g)  + 2H2O(g)  (∆H° = -802 kJ/mol)…

Q: H2 and F2 react according to the following equation, forming HF. H2(g) + F2(g) → 2HF(g); ΔH° = –271…

A: According to thermodynamics, we deal with two types of reactions: Exothermic: The type of reaction…

Q: When a chemist burns ammonia according to the reaction below she finds that the reaction releases…

A: First, calculate the moles of ammonia by using its molar mass,

Q: A chemist measures the energy change AH during the following reaction: C,Hg(9)+50,(9) → 3 CO 2(g)+…

A: Answer :-  a) Exothermic  b) Yes, released  c) 1.83 × 103 kJ…

Q: Consider the reaction, C2H4(g) + H2(g) → C2H6(g), where ΔH = –137 kJ. How many kilojoules are…

A: Molar mass of C2H4 =(2×12+4×1) g/mol                                      = (24+4) g/mol…

Q: In the following reaction, how many moles of CH;OH are required to produce -3.871 × 10³ kJ of heat?…

A: The given reaction is:2 CH3OH (l) + 3 O2 (g) → 2 CO2 (g) + 4 H2O (g)∆H° = -1280 kJ⇒ 1280 kJ of…

Q: C2H;OH (1) + O2 (g) → CO2 (g) + H2O (1) AH,ræn = –1418 k mol How many grams of CO2 were produced if…

A: An equation representing the combustion reaction of ethanol that give CO2 and H2O, for which the…

Q: A chemist measures the energy change AH during the following reaction: Cl₂(g) + H₂(g) → 2 HCl (g)…

A: Given reaction : Cl2(g)+H2(g)→2 HCl (g) ΔΗ=-184. kJ

Q: 9. Consider the reaction, 3 NO2(3) + H2O(1) 2 HNO3(aq) + NO(g), where AH = -137 kJ. How many…

A: The amount of heat released when 92.3 g of NO2 reacts according to given reaction is to be…

Q: 4. Baking soda, NaHCO3, decomposes when it is heated. How much heat will be absorbed by the…

A: Given :-Baking soda , NaHCO3, decomposes when ifis heated. we have to find how much heat willbe…

Q: 13. Energy is stored in the body in adenosine triphosphate, ATP, which is formed by reaction between…

A: ATP is the cell's energy currency. It is required by the cells for performing various functions in…

Q: P4(s) + 6 Cl2(g) → 4 PC13(g) ΔΗ -1, 148 kJ Select the correct phrase in each dropdown box to…

A: Introduction Exothermic reactions are those which release energy in the form of heat and possess…

Q: reacts

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Q: When 2 moles of CO(g) react with NO(g) to form CO2(g) and N2(g) according to the following equation,…

A: Given that 747 kJ of energy are evolved in the reaction.

Q: What is the change in enthalpy in kilojoules when 2.30mol of Mg is completely reacted according to…

A: Given2Mg(s)+O2(g)→ 2MgO(s),      ∆H=-1204KJNo. of mole of Mg=2.30mole2 mole of Mg consume to produce…

Q: The reaction below has an enthalpy change of 198 kJ. How many grams of sulfur dioxide are produced…

A: Given :-  2 SO3 (g) →  2 SO2 (g)  +  O2 (g)  ∆H = 198 kJ  To calculate :-  Mass of SO2 produced (in…

Q: 13. The value of AH° for the reaction below is +128.1 kJ: CH,ОН() —> СО(g)+ 2H ,(g) How many kJ of…

A:

Q: When 1 mole of CH4(g) reacts with H2O(g) to form H2(g) and CO(g) according to the following…

A: Answer: Endothermic Since 206 kJ of energy is absorbed,  Energy abosrbed process are called…

Q: A chemist measures the energy change AH during the following reaction: Cl(g)+H2(g) → 2 HCl(g)…

A: Given reaction: Cl2 (g) + H2 (g) → 2HCl (g)     ∆H = -184. kJ We have to find whether this reaction…

Q: How much heat (in kilojoules) is evolved when 135 g of aluminum reacts completely in the following…

A: Applying mole concept and unitary method for calculation.

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.    

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.