1). Write mathematical expression of the first law of thermodynamics. 2). Calculate, how much energy must be added to 200 g of water in a pan for it is to be warmed from 20°C to 70°C. Assume heat capacity of water is 4.18 J/(K:g). 3). The enthalpy change for combustion of the gasoline is –34 kJ/g. Calculate, how much heat is released at combustion of 0.5 kg of the gasoline at constant pressure. 4). The combustion of acetylene proceeds according to equation 2C 2 H 2 + 50 2 → 4CO 2 + 2H 2 0. The enthalpy change of this process is –1300.0 kJ/mol. Use the following from Hess's law and calculate the enthalpy of formation of 1 mol of acetylene, if fH(CO 2 ) = -393.5 kJ/mol, fH (H 2 0) = -241.8 kJ/mol,

1). Write mathematical expression of the first law of thermodynamics. 2). Calculate, how much energy must be added to 200 g of water in a pan for it is to be warmed from 20°C to 70°C. Assume heat capacity of water is 4.18 J/(K:g). 3). The enthalpy change for combustion of the gasoline is –34 kJ/g. Calculate, how much heat is released at combustion of 0.5 kg of the gasoline at constant pressure. 4). The combustion of acetylene proceeds according to equation 2C 2 H 2 + 50 2 → 4CO 2 + 2H 2 0. The enthalpy change of this process is –1300.0 kJ/mol. Use the following from Hess's law and calculate the enthalpy of formation of 1 mol of acetylene, if fH(CO 2 ) = -393.5 kJ/mol, fH (H 2 0) = -241.8 kJ/mol,

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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