When determining the energy of a reaction where 0.250 mol of a substance with a ΔHcomb = -2250.0 kJ/mol reacts, we perform this calculation (attached): Why can’t we simply say that the energy of the reaction is

Q: 3. When potassium chloride reacts with oxygen under the right conditions, potassium chlorate is…

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Q: Consider the following reaction: 2 Mg + O2  2 MgO,  Hrxn = -1,203 kJ.Calculate the amount of heat…

A: The given balanced chemical reaction is as follows:

Q: The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In…

A: We have to calculate the energy of combustion per gram of unknown compound.

Q: An unknown sample of coal is burned in an apparatus with a calorimeter constant of 1.49 kJ/°C. When…

A:

Q: One day while camping, a student used a propane stove to boil some water. The student heated 5.00 L…

A: We have to calculate the efficiency of the propane camp stove .

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: seM Determine the mass (in g) of O2lg) that was consumed during this

A: A combustion reaction is a type of chemical reaction in which a compound and an oxidant is reacted…

Q: A chemist measures the energy change AH during the following reaction: 2 HgO(s) → 2 Hg(1) + O₂(g)…

A: In an exothermic reaction, heat is released, and in an endothermic reaction, heat is absorbed.

Q: If you have 6.0 moles of ammonia, how much energy in kJ released in the chemical reaction? N2 (g) +…

A: Answer is A) -280 kJ

Q: In the following experiment, a coffee-cup calorimeter containing 100 mL of H2O is used. The initial…

A: Calculate the heat released when 9.10 g of CaCl2 is dissolved:

Q: According to the following thermochemical equation what mass of HF (in g) is required to produce 345…

A: The molar mass of HF is 20.1 g/mole

Q: A chemist measures the energy change AH during the following rea 2 HgO(s)→ 2 Hg(1)+ O₂(g) Use the…

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Q: a. N2 (g) + 3Cl2(g) → 2NCl3(g) ΔHo = 460 kJ/ mol; ΔSo = - 275 J/ K b. N2(g) + 3F2(g) → 2NF3(g) ΔHo =…

A: Here given multiple question...

Q: The ΔH for the oxidation of sulfur in the gas phase to SO3 is -204 kJ/mol and for the oxidation of…

A: The enthalpy of reaction (ΔH0rxn) is the heat released or absorbed during a chemical reaction.…

Q: Magnesium burns in air to produce a bright light and is often used in fireworks displays. The…

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Q: The heat of combustion of ethanol is -1367 KJ/mol, a batch of sauvignon Blanc wine contains 10.6%…

A: GivenThe heat of combustion of ethanol is —1367 kJ/mol.The mass percent of ethanol in the wine is…

Q: Consider the reaction: When a 10.0-g sample of ethyl alcohol (molar mass = 46.07 g/mol) is…

A: The given reaction is : C2H5OH(l)+3O2(g)→2CO2(g)+3H2O(l)        ∆H=-1.37×103 kJ

Q: A chemist measures the energy change AH during the following reaction: 2 H₂O(1)→ 2 H₂(g) + O₂(g) Use…

A: In an exothermic reaction, heat is released and in an endothermic reaction, heat is absorbed.

Q: A chemist measures the energy change AH during the following reaction: 2 HgO(s) → 2 Hg(1) + O₂(g)…

A: The definition of an exothermic reaction is one in which the system (where the reaction is taking…

Q: When determining the energy of a reaction where 0.250 mol of a substance with a ΔHcomb = -2250.0…

A: Given : ΔHcomb = -2250.0 kJ/mol And moles of reactant combusting = 0.250 mol.

Q: Consider the following reaction: 2 Mg + O2  2 MgO,  Hrxn = -1,203 kJ.Calculate the amount of heat…

A: The enthalpy change or heat released/absorbed during a chemical reaction as represented by a…

Q: 7. In a calorimeter, 50.00 mL of 2.50 M NaOH was combined with 50.00 mL of 2.25 M HCI to form a…

A: Heat absorbed by a system = mass of the system x heat capacity x change in temperature

Q: For exothermic reactions, the products have lower energy than the reactants.Explain why

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Q: A chemist measures the energy change AH during the following reaction: 2 NH3(g) → N₂(g)+3H₂(g) Use…

A:

Q: An unknown sample of coal is burned in an apparatus with a calorimeter constant of 1.62 kJ/°C. When…

A:

Q: The heat of the solution of ammonium nitrate is 26.2 kJ/mol. If a 5.368 g sample of NH₄NO₃ is added…

A: Heat of the solution of ammonium nitrate = 26.2 kJ/mol Mass of ammonium nitrate = 5.368 g Volume of…

Q: The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In…

A: First, we have to find the heat capacity of the calorimeter using the data given for salicylic acid.…

Q: 4. The reaction of 250.0 mL of a 1.00 M hydrochloric acid solution with 250.0 mL of a 1.00 M sodium…

A: The amount of heat released when one mole of acid reacts with one mole of the base to form one mole…

Q: One day while camping, a student used a propane stove to boil some water. The student heated 5.00 L…

A: Given :  Volume of water = 5.00 L = 5000 ml  Initial temperature of water= 15.6 °C  Final…

Q: A chemist measures the energy change AH during the following reaction: 2 H₂O(1)→ 2 H₂(g) + O₂(g) ΔΗ…

A: 2 H2O (l) → 2 H2 (g) + O2 (g) ΔH = 572 kJMass of water = 64.5 grams

Q: An unknown sample of coal is burned in an apparatus with a calorimeter constant of 0.8 kJ/°C. When a…

A:

Q: The ΔH value for the reaction is -90.8 kJ. How much heat is released when 198.1 g Hg is reacted with…

A: Reaction involved :- 2Hg + O2 = 2HgO

Q: 25.00 mL of 0.200 M sulfuric acid was added to 25.00 mL of 0.200 M NAOH, in a constant volume…

A:

Q: How much energy (in kJ) is required to change the temperature of 1.00 kg Fe from 25.0 °C to 1515 °C?…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: An unknown sample of coal is burned in an apparatus with a calorimeter constant of 0.75 kJ/°C. When…

A: Given:  Calorimeter constant(C)= 0.75 KJ/°C  Mass of sample(m) = 0.412 gm  Increase in temperature…

Q: During an exothermic reaction, H for the reactants was 890 kJ/mol. Which of the following statements…

A: Explanation to the correct answer is given below.