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19 Nov 2019
Heat, q, is energy transferred between a system and its surroundings. For a process that involves a temperature change q = m middot C_ Delta T where C_s is specific heat and m is mass. Heat can also be transferred at a constant temperature when there is a change in state. For a process that involves a phase change q = n middot Delta H where, n is the number of moles and Delta H is the enthalpy of fusion, vaporization, or sublimation. The following table provides the specific heat and enthalpy changes for water and ice. Calculate the enthalpy change, Delta H, for the process in which 17.9 g of water is converted from liquid at 0.7 degree C to vapor at 25.0 degree C. For water, Delta H_vap = 44.0 kJ/mol at 25.0 degree_C and C_ = 4.18 J/(g middot degree C) for H_2O(l). Express your answer to three significant figures and include the appropriate units. How many grams of ice at -29.0 degree C can be completely converted to liquid at 26.8 degree C if the available heat for this process is 4.57 times 10^3kJ? For ice, use a specific heat of 2.01 J/(g middot degree C) and Delta H_fus = 6.01kJ/mol. Express your answer to three significant figures and include the appropriate units.
Heat, q, is energy transferred between a system and its surroundings. For a process that involves a temperature change q = m middot C_ Delta T where C_s is specific heat and m is mass. Heat can also be transferred at a constant temperature when there is a change in state. For a process that involves a phase change q = n middot Delta H where, n is the number of moles and Delta H is the enthalpy of fusion, vaporization, or sublimation. The following table provides the specific heat and enthalpy changes for water and ice. Calculate the enthalpy change, Delta H, for the process in which 17.9 g of water is converted from liquid at 0.7 degree C to vapor at 25.0 degree C. For water, Delta H_vap = 44.0 kJ/mol at 25.0 degree_C and C_ = 4.18 J/(g middot degree C) for H_2O(l). Express your answer to three significant figures and include the appropriate units. How many grams of ice at -29.0 degree C can be completely converted to liquid at 26.8 degree C if the available heat for this process is 4.57 times 10^3kJ? For ice, use a specific heat of 2.01 J/(g middot degree C) and Delta H_fus = 6.01kJ/mol. Express your answer to three significant figures and include the appropriate units.
Beverley SmithLv2
2 Oct 2019