Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: A,H° = E npAf H° (products) – E nAf H° (reactants) where n represents the stoichiometric coefficients. Пр.

Q: Consider the chemical equation 2 A + 3 B ---> 4 C + D The reaction enthalpy is 705 kJ How many…

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Q: When methanol, CH, OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is…

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

Q: A coffee-cup calorimeter having a heat capacity of 472 J/°C is used to measure the heat evolved when…

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Q: When octane (C,H3, density = 0.699 g/mL) undergoes complete 18 combustion, it provides energy…

A: Given that, 2 moles of octane release 10932 kJ of energythe density of octane - 0.699 g/mL = 0.699…

Q: The reaction of hydrogen and nitrogen gases produces 5.00 g of ammonia and releases 3250 cal of…

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Q: Since the water absorbs 127 J of heat, this means the unknown metal released 127 J of heat. Based on…

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Q: An office heater puts out 2010 Btu (British thermal units) of energy in the form of heat per hour.…

A: Given: Amount of energy produced per hour = 2010 Btu/hr .

Q: The heat equation, as given in the introduction, can also be rearranged to calculate the mass or…

A: The specific heat required to raise the temperature of a substance is given as:

Q: reaction for C,H, is 3) 12 CO, (g) + 6 H,O(1) + 6542 kJ and the heat produced from the burning is…

A: Final Temperature of water = 29.80°C

Q: long path acb, 100 J of heat flows into the system and the system does OJ of work. (a) How much heat…

A: The energy change during a process is always conserved. The internal energy is a state function; it…

Q: Consider the reaction: CH,OHØ) + 30, )→200,(e) + 3H,O), AH=-1.37 x 10' k When a 21.1-g sample of…

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Q: CS2(l) + 4H2(g) CH4(g) + 2H2S(g) This reaction occur spontaneously as written when all reactants and…

A: The standard Gibbs free energy of given reaction is determined as,

Q: CaCO3(s) + 2H+(aq) Ca2+(aq) + H2O(l) + CO2(g) this reaction occurs spontaneously as written when all…

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Q: In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used…

A: Heat released by silver can be calculated as

Q: 1) What is the specific heat capacity of a substance if 55.00 grams of this substance absorbs 198…

A: In thermodynamics specific heat capacity of sabstance is equal to the amount of energy required to…

Q: Solid urea, (NH2)2CO, burns to give CO2,N2, and liquid H,0. Its heat of combustion is -6322 kl/mol…

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Q: If the mass of a truck is tripled-for example, when it is loaded-by what factor does the kinetic…

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Q: When determining the heat capacity of the unknown metal we assumed the heat capacity of water has a…

A: When determining the heat capacity of the unknown metal we assumed the heat capacity of the water…

Q: (a) Mass of the Calorimeter (two empty cups) in g: 4.0g (b) Mass of the cold water and the…

A: Given data:

Q: A certain chemical reaction releases 21.4 kJ/g of heat for each gram of reactant consumed. How can…

A: 38520kj heat produced by the consumption of 1.8kg of reactant.

Q: When methanol, CH,OH, is burned in the presence of oxygen gas, O,, a large amount of heat energy is…

A: CH3OH + 3/2 O2 ...> CO2 + 2H2O dH = -764 KJ Enthalpy of reaction is negative. It means combustion…

Q: 2C6H6() + 15 O2(g) – 12 CO2(g) + 6 H20(/) AH = -5.884 x 103 kJ - An unknown amount of C6H6(/) was…

A: Given 2C6H6(l) +15O2 (g) -> 12CO2 (g) + 6 H2O (l) Delta H = -5.884 × 103 KJ  For unknown amount…

Q: When methanol, CH,OH, is burned in the presence of oxygen gas, O,, a large amount of heat energy is…

A: Enthalpy of reaction = - 764 kJ/mol Energy required = 729 kJ We need to find mass of methanol to be…

Q: A piece of copper metal is initially at 100.0°C. It is dropped into a coffee cup calorimeter…

A: Given data,

Q: Hydrogen sulfide, H2S, is produced during decomposition of organic matter. When 0.6850 mol H2S burns…

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Q: the standard enthalpies of fo

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Q: Condensation of water in the air is an important process in determining the climate of an area. When…

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Q: Consider the reaction. heat 2 Al(s) + Fe,03(s) Al,O3(s) + 2 Fe(l) If 11.5 kg Al reacts with an…

A: Given, 11.5 kg of Al reacts Find, How many Kg of Al2O3 will produced.

Q: The heat involved in a temperature change can be calculated using the following equation. Q (heat)…

A: Given : Initial temperature of water = 20 oC Final temperature of water = 24 oC Mass of water = 50.0…

Q: After absorbing 1.850 kJ of energy as heat, the temperature of a 0.500 kg block of copper is 37 oC.…

A: Specific heat capacity is the amount of heat required to raised the temperature by 1 oC when heating…

Q: Hydrogen sulfide is produced during the decomposition of organic matter. When 0.5380 mol H2S burns…

A: Given: H2S burns to produce SO2(g) and H2O(g) with heat release of -278.7 kJ

Q: When 145 mL of 0.212 M NaCl(aq) and 145 mL of 0.212 M AgNO3(aq), both at 21.1°C, are mixed in a…

A: Moles of AgNO3 = Molarity× Volume = 0.212 M × (145/1000)L = 0.03074 moles

Q: You very carefully heat the compound for an extended period of time to drive off water, after which…

A: (i) Yes, it is correct formula of hydrated salt (ii) Mass of water = 0.2500 - 0.1598   = 0.0902 g…

Q: When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is…

A: Given reaction:

Q: Industrial production of nitric acid, which is used in many products including fertilizers and…

A: GIVEN, chemical reaction :  4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) mass of NH3 = 7.000 x 103 g

Q: What are the requirements for a formation reaction? Select one or more: a. the formation of one…

A: Formation reaction is the reaction in which one mole of a substance is produced from its elements in…

Q: True or False If the statement is true, write "true." If it is false, change the underlined word or…

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Q: When 135 mL of 0.204 M NaCl(aq) and 135 mL of 0.204 M AgNO3(aq), both at 21.5°C, are mixed in a…

A: Coffee cup calorimeter is a steady pressure calorimeter. As such, the heat measured in such a system…

Q: What is the sum of coefficients from the following reaction (both products and reactants)? X.3H2O +…

A: We have to predict the sum of coefficient of product and reactant.

Q: During an experiment, a student calculated the heat of neutralization reaction to be - 52.8 kj/mol.…

A: Please find the attached images for the answer

Q: What is the sum of coefficients from the following reaction (both products and reactants)? X.3H2O +…

A: Dehydration :-  The process of removal of water from a substance is known as dehydration When a…

Q: The combustion of one mole of benzene, C6H6, in oxygen liberates 3268 kJ of heat. The products of…

A: Given,  The combustion of one mole of benzene, C6H6, in oxygen liberates 3268 kJ of heat  The…

Q: If 2.36 g of calcium dichloride dissolves in 84.00 g of water in a kalorimeter at a constant…

A: 2.36 g of calcium dichloride dissolves in 84.00 g of water Mass of solution = mass of CaCl2 + mass…

Q: If a system has 475 kcal of work done to it, and releases 5.00 x 102 kJ of heat into its…

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Q: If a system has 225 kcal of work done to it, and releases 5.00 x 10² kJ of heat into its…

A: Given, Work done on the system W=225 Kcal    {As work is done by the system , so  W is +ve} Heat…

Q: Hydrogen sulfide, H2S, is produced during decomposition of organic matter. When 0.3620 mol H2S burns…

A: Given :-  H2S (g) + O2 (g) → SO2 (g) + H2O (g)  ∆H = -187.5 kJ  To calculate :-  Given heat into…

Q: 1.     Ammonia can be generated by heating together the solids NH4Cl and Ca(OH)2. Other products of…

A: Note: As per our guidelines, we are supposed to answer only one question. Kindly, repost other…