In order to continue enjoying our site, we ask that you confirm your identity as a human. Thank you very much for your cooperation.
The answer is #"116 kJ"#. You need to go through two stages in order to find the total heat required to completely boil #"45.0 g"# of water. First, you must provide enough heat to get the water to #"100"^@"C"#. This is calculated by using #q_1 = m * c * DeltaT#, where #c# - water's specific heat - #"4.184 J/g" * ^@"C"#. You get #q_1 = "45.0 g" * 4.184 J/(g*^@C) * (100.0 -25.0)^@C = 14121# #"J"# Then, you must provide enough heat to get all the water from liquid to steam. This is calculated using water's enthalpy of vaporization, #DeltaH_("vap")# - #"40.68 kJ/mol"#. We can go to moles of water using its molar mass, #"18.0 g/mol"# #n_("water") = m/("molar mass") = ("45.0 g")/("18.0" ("g")/("mol")) = 2.50# #"moles"# #q_2 = n_("water") * DeltaH_("vap") = "2.50 moles" * "40.68" ("kJ")/("mol") = 101.7# #"kJ"# Therefore, the total energy in the form of heat that is needed is #q_("TOTAL") = q_1 + q_2 = 14121*10^(-3)# #"kJ" + 101.7# #"kJ"# #q_("TOTAL") = 116# #"kJ"#
Recommended textbooks for you Living By Chemistry: First Edition Textbook Chemistry: Principles and Practice Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer Publisher:Cengage Learning General Chemistry - Standalone book (MindTap Cour... Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell Publisher:Cengage Learning Chemistry: The Molecular Science Author:John W. Moore, Conrad L. Stanitski Publisher:Cengage Learning Chemistry & Chemical Reactivity Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel Publisher:Cengage Learning Chemistry & Chemical Reactivity Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel Publisher:Cengage Learning Living By Chemistry: First Edition Textbook ISBN:9781559539418 Author:Angelica Stacy Publisher:MAC HIGHER Chemistry: Principles and Practice ISBN:9780534420123 Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer Publisher:Cengage Learning General Chemistry - Standalone book (MindTap Cour... ISBN:9781305580343 Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell Publisher:Cengage Learning Chemistry: The Molecular Science ISBN:9781285199047 Author:John W. Moore, Conrad L. Stanitski Publisher:Cengage Learning Chemistry & Chemical Reactivity ISBN:9781337399074 Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel Publisher:Cengage Learning Chemistry & Chemical Reactivity ISBN:9781133949640 Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel Publisher:Cengage Learning |