Chemistry, 17.04.2020 02:10 maybaby7545
From the following heats of combustion, CH3OH(l) + 3 2 O2(g) β CO2(g) + 2H2O(l) ΞH o rxn = β726.4 kJ/mol C(graphite) + O2(g) β CO2(g) ΞH o rxn = β393.5 kJ/mol H2(g) + 1 2 O2(g) β H2O(l) ΞH o rxn = β285.8 kJ/mol Calculate the enthalpy of formation of methanol (CH3OH) from its elements: C(graphite) + 2H2(g) + 1 2 O2(g) β CH3OH(l) kJ/mol
Answers: 2
Chemistry, 22.06.2019 00:30
Lem 2 the data below are for the system ethyl propyl ether (1)-chloroform (2) at 0.5 bar. use the data to answer the following questions (all questions refer to p d 0: 5 bar). a) what are the boiling points of the pure components at 0.5 bar? b) a mixture with the overall composition z1 d 0: 1 is brought to 47.6˱c, 0.5 bar. what is the phase? c) 100 mole of a mixture with z1 d 0: 1 (state a) is mixed with 22 mole of pure ethyl propyl ether vapor (state b). the mixing takes place at 47.6 ˱c, 0.5. bar. what is the phase of the resulting mixture (state c)? if the state is a v/l mixture report the number of moles and mole fractions in each phase. d) plot the txy graph and show states a, b and c. the graph must be done by computer and should be properly annotated. ethyl propyl ether (1) - chloroform (2) at 0.5 bar t ( ˱c) x1 y1 t ( ˱c) x1 y1 42.9 0.000 0.000 49.0 0.470 0.455 43.0 0.020 0.010 49.1 0.520 0.520 43.9 0.065 0.029 48.9 0.567 0.592 45.4 0.156 0.089 48.3 0.652 0.720 46.4 0.215 0.142 47.6 0.745 0.815 47.6 0.296 0.223 46.7 0.822 0.872 48.3 0.362 0.302 45.7 0.907 0.937 48.7 0.410 0.375 44.6 1.000
Answers: 3
Chemistry, 22.06.2019 06:30
Three cards with holes are arranged in a straight line. a light is shined through the first cardβs hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line
Answers: 1
Chemistry, 23.06.2019 01:30
Which conclusion fits the data in the table? a. heat chemically changes chocolate and margarine. b. all solids become liquid at 100Β°f. c. removing heat from a substance it to melt. d. matter may change shape when it is heated.
Answers: 1
From the following heats of combustion, CH3OH(l) + 3 2 O2(g) β CO2(g) + 2H2O(l) ΞH o rxn = β726.4 kJ...
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