Archive day

December 7, 2025

708 public questions were asked on this day.

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Consider the following two reactions: (i) CH4 + 2O2 (g) CO2 (g) + 2 H2O (g) H = –890.4kJ (ii) H2 (g) + I2 (g) 2HI(g) –12.40 kJ Which of the following rows correctly matches the two reactions? Row i ii A. Exothermic Exoth...
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A calorimeter is adiabatic (no heat is transferred between the calorimeter and its surroundings). During a process, if the reactants are at an initial temperature T1 and the exothermic reaction raises the temperature to...
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Which of the following assumptions should be made for the calculation of enthalpy change of a reaction using simple calorimeter? a. The system is open. b. The process takes place under constant temperature. c. The proces...
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The relationship between heat transfer and change in temperature is given by Q = mct, where c is specific heat capacity. Under what conditions will c = Q? a. m = 1 kg T = 1 oC b. m = 1 g T = 10 oC c. m = 10 g T = 10 oC d...
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A solid sample of granite, mass 200 g, is cooled such that it loses 4.537 kJ of heat. The specific heat capacity of granite is 0.790 J/g oC at SATP. The reduction in temperature is a. 38.7 oC b. 28.7 oC c. 48.7 oC d. 18....
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How much heat is gained when the temperature of 288 g of liquid water is raised from 100 oC to 125 oC? a. 30 618 J b. 30 168 J c. 20 168 J d. 20 618 J e. 120 384 J
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100 g of a liquid is 25 oC and is heated to raise the temperature of the liquid to 50.0 oC. The thermal energy gained by the liquid is 6100 J. The specific heat of the liquid is a. 0.82 J/g oC b. 2.44 J/g oC c. 2.06 J/g...
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The enthalpy change for reaction N2 + 3H2(g) 2NH3(g) is 92.2kJ. The enthalpy of formation of ammonia is a. –92.2 kJ b. –46.1 kJ c. –46.1 kJ/mol d. –92.2 kJ/mol e. cannot be determined
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