A student combusted a certain quantity of methane gas in a calorimeter. The literature indicates the molar heat of combustion of methane is -278 kJ/mol. The calorimeter contained 1.25 kg of water at an initial temperature of 21º C. If the final temperature of the water rose to 37.5 ºC, how much methane (in grams) must have been combusted? Cwater= 4.184 J/g C

Q: A 20.0 g block of iron (molar heat capacity 25.1 J/mol °C) at 83.4 °C is placed into 200.0 g of…

A: Answer:This question is based on law of conservation of energy where energy lost by hotter object…

Q: Iron has a specific heat capacity of 0.45 J/g C. If a piece of iron at 95 C is added to 175 g of…

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Q: 1.30 kg of an unknown substance was heated up using 7,198 cal energy from 46.8 degree celsius to…

A: Given: Mass of the substance, m=1.30 kg=1.30 x 1000=1300 g Heat provided,q =7,198 cal =7198 x 4.184…

Q: What mass of magnesium is required to produce sufficient energy to heat 339 mL of water (density =…

A: We need to find the mass of magnesium required to produce sufficient energy to hear 339 ml water…

Q: When copper(II) sulfate pentahydrate (CuSO4·5 H2O) is heated, it decomposes to the dehydrated form.…

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Q: If 1.42 kcal of energy is required to raise the temperature of a 190 g sample of pure iron, by how…

A: Q - heat = 1.42 Kcal m - mass = 190 g C - specific heat =0.45 J/g-°C ΔT - change/rise in temperature…

Q: What is the change in energy of a gas at a pressure of 135 kPa, if the gas loses 250 J of energy as…

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Q: Zinc metal reacts with HCl according to the balanced equation: Zn + 2HCl à ZnCl2 + H2 When 0.103 g…

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Q: A 37.2 g sample of zinc is heated to 124oC. It is then placed in a coffee cup calorimeter containing…

A: Mass of sample of Zinc = MZn = 37.2 g Specific heat of zinc = cZn = 0.387 J/(g oC)  Temperature of…

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

A: Given reaction is, 2 HgO (s)  →  2 Hg (l) + O2 (g)                     ∆H = 182 kJ As,  ∆H is…

Q: Lightweight camping stoves typically use a mixture of Cs and C6 hydrocarbons, which is called white…

A: Molecular mass of C5H12 = 72.15g/mol Enthalpy of combustion = -3550kJ/mol Volume of water = 1.5L Ti…

Q: When 18.0 mL of water at 11.0 C is combined with 20.0 mL of water at 55.0 C, what is the final…

A: Given : Volume of cold water = 18.0 mL Initial temperature of cold water = 11.0 oC Volume of hot…

Q: A piece of gold (specific heat of 0.129 J/g oC) at 190 oC is placed in 165 mL of water. The initial…

A: The heat lost by the piece of gold is absorbed by water. The amount of heat absorbed by water can be…

Q: 8. The caloric content of some pasta (listed on the side of the box of pasta!) is 4.000 kcal per…

A: The amount of heat required to increase the temperature of one kilo gram of a substance by one…

Q: A sample of methane experiences a temperature change of -92.79 °C while releasing 487.4 joules of…

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Q: Calculate the energy in joules to heat a cube of aluminum with a volume of 12.0 cm^3 from 15 Celsius…

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Q: A student runs two experiments with a constant-volume "bomb calorimeter containing 1000. g or water…

A: The objective of the question is toIdentify the reaction as exothermic or endothermic.Calculate the…

Q: When CO(g) reacts with O2 (g) according to the following reaction, 283 kJ of energy are evolved for…

A: In a thermochemical equation, the enthalpy change (ΔH) of a chemical reaction is also written with…

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: e final

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Q: At constant volume, the heat of combustion of a particular compound is -3863 kJ/mol. When 1.163 g of…

A: Heat capacity is the amount of heat required to raise the temperature of a substance by 1 degree…

Q: For the combustion of methane(CH4)   CH4 (g)  + 2 O2 (g)  -->  CO2 (g) + 2H2O (g)       Δ H = -882…

A: In a thermochemical equation, the term, ∆H , represents the change in heat energy per mol reaction.…

Q: IN B C. LI %#3 Assume that it is possible to heat water with perfect insulation (all the heat from…

A: Assume that it is possible to heat water with perfect insulation (all the heat from combustion of…

Q: 2.75 g Pb(NO3)2 is added to excess Na2SO4 in a coffee cup calorimeter. The temperature changes from…

A: The balanced equation for the reaction between Pb(NO3)2(aq) and Na2SO4(aq) is: Pb(NO3)2(aq) +…

Q: What is the change in energy of a gas at a pressure of 135 kPa, if the gas loses 250 J of energy as…

A: A gas is compressed from 42.8L to 31.3L at a pressure of 135KPa. The gas loses 250J of energy. What…

Q: A student measures the following data regarding the heat of fusion of ice: 25.3 g ice at 0.0°C is…

A: Answer: This question is based on conservation of energy where energy gained by ice will be equal to…

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

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Q: A 25.0 g block of copper (specific heat capacity 0.380 J/g °C) at 99.4 °C is placed into 500.0 g of…

A: Q = m . s . ΔT Where, Q = heat absorbed or evolved; m = mass of substance; s = specific heat of…

Q: A small piece of metal is heated and placed in a foam cup calorimeter containing 50.0 mL of water at…

A: q= mc∆t Q= 522.2joule

Q: temperature of a 11.8 g sample of calcium carbonate [CaCO3 (s)] increases from 24.8 °C to 38.0 °C.…

A: Specific Heat capacity is amount of heat required to increase one gram of substance by one degree…

Q: A 319−g aluminum engine part at an initial temperature of 11.47°C absorbs 61.0 kJ of heat. What is…

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Q: Fifty (50.0) grams of hot water at 65.0oC is mixed with 40.0 g of cold water. The final temperature…

A: The amount of heat released or absorbed by a system is calculated by using the following expression:…

Q: A chemical reaction takes place and the H is recorded for reactants as being 200 kJ.  The products…

A: The reaction is a endothermic reaction.

Q: ESee Periodic Table V See Hint If 1495 Jof heat is needed to raise the temperature of a 325 g sample…

A: Since Q is given by  Q = mCΔT where Q = heat = 1495 J m = mass of metal = 325 g C = specific heat…

Q: If 87 J of heat are added to a balloon, causing it to expand from 1.0 L to 1.4 L under 0.97 atm of…

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Q: 4.) The specific heat of aluminum is 0.900 J/g.°C. a) Calculate the energy required to raise the…

A: Heat required to raise the temperature of the substance can be determined by using the formula :…