For the complete combustion of ethanol, C2H5OH (l) + 3O2 (g) �
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    Thermodynamics

    Multiple Choice QuestionsShort Answer Type

    301.

    For an isolated system, <pre>uncaught exception: <b>Http Error #404</b><br /><br />in file: /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php line 61<br />#0 [internal function]: com_wiris_plugin_impl_HttpImpl_0(Object(com_wiris_plugin_impl_HttpImpl), NULL, 'http://www.wiri...', 'Http Error #404') #1 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/php/Boot.class.php(769): call_user_func_array('com_wiris_plugi...', Array) #2 [internal function]: _hx_lambda->execute('Http Error #404') #3 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/haxe/Http.class.php(532): call_user_func_array(Array, Array) #4 [internal function]: haxe_Http_5(true, Object(com_wiris_plugin_impl_HttpImpl), Object(com_wiris_plugin_impl_HttpImpl), Array, Object(haxe_io_BytesOutput), true, 'Http Error #404') #5 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/php/Boot.class.php(769): call_user_func_array('haxe_Http_5', Array) #6 [internal function]: _hx_lambda->execute('Http Error #404') #7 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(27): call_user_func_array(Array, Array) #8 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/haxe/Http.class.php(444): com_wiris_plugin_impl_HttpImpl->onError('Http Error #404') #9 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/haxe/Http.class.php(458): haxe_Http->customRequest(true, Object(haxe_io_BytesOutput), NULL, NULL) #10 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(40): haxe_Http->request(true) #11 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/TextServiceImpl.class.php(80): com_wiris_plugin_impl_HttpImpl->request(true) #12 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/service.php(19): com_wiris_plugin_impl_TextServiceImpl->service('mathml2accessib...', Array) #13 {main}</pre>what will be increment straight S?

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    302.

    For the reaction,
       2 Cl left parenthesis straight g right parenthesis space rightwards arrow space Cl subscript 2 left parenthesis straight g right parenthesis comma space what space are space the space signs space of space increment straight H space and space increment straight S ?

    112 Views
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    Multiple Choice QuestionsMultiple Choice Questions

    303.

    The heats of combustion of carbon and carbon monoxide are −393.5 and −283.5 kJ mol−1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is:

    • 676.5

    • -676.5

    • -110.5

    • -110.5

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    304.

    The following reaction is performed at 298 K
    2NO(g) + O2 (g) ⇌ 2NO2 (g)
    The standard free energy of formation of NO (g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO2 (g) at 298 K? (KP = 1.6 x 1012)

    • R (298) In (1.6 x 1012)-86600

    • 86600 + R (298) In (1.6 x 1012)

    • 86600 - In(1.6 x 1012)/R(298)

    • 86600 - In(1.6 x 1012)/R(298)

    564 Views
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    305.

    The standard Gibbs energy change at 300 K for the reaction, 2A  ⇌ B +C is 2494.2J at a given time, the composition of the reaction mixture isleft square bracket straight A right square bracket space equals space 1 half comma space left square bracket straight B right square bracket space equals 2 and left square bracket straight C right square bracket space equals space 1 half, The reaction proceeds in the [R= 8.314 JK/mol, e = 2.718]

    • forward direction because Q>Kc

    • reverse direction because Q>Kc

    • forward direction because Q < Kc

    • forward direction because Q < Kc

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    306.

    For the complete combustion of ethanol, C2H5OH (l) + 3O2 (g) → 2CO2 (g) + 3H2O (l), the amount of heat produced as measured in a bomb calorimeter, is 1364.47 kJ mol-1 at 25oC. Assuming ideality the enthalpy of combustion, ∆CH, for the reaction will be (R = 8.314 JK-1 mol-1)

    • -1366.95 kJ mol-1

    • -1361.95 kJ mol-1

    • -1460.50 kJ mol-1

    • -1460.50 kJ mol-1

    A.

    -1366.95 kJ mol-1

    C2H5OH (l) + 3O2 (g) → 2CO2 (g) + 3H2O (l),
    ∆U = - 1364.47 kJ/mol
    ∆H = ∆U +∆ngRT
    ∆ng = -1
    ∆H = - 1364.47 +
    [Here, value of R in unit of J must be converted into kJ]
     = - 1364.47-2.4776
     = -1366.94 kJ/mol
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    307.

    A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.00C. As it does so, it absorbs 208J of heat. The values of q and w for the process will be:(R = 8.314 J/mol K) ( ln 7.5 = 2.01)

    • q =+208J, W = - 208 J

    • q =-208 J, W =-208 J

    • q=-208J, W = +208 J

    • q=-208J, W = +208 J

    541 Views
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    308.

    The incorrect expression among the following is

    • fraction numerator increment space straight G subscript system over denominator increment straight G subscript total end fraction space equals space minus straight T

    • In isothermal process

      straight W subscript reversible space equals negative nRT space ln straight V subscript straight f over straight V subscript straight i

    • In space straight K space equals space fraction numerator increment straight H to the power of straight o minus straight T increment straight S over denominator RT end fraction
    • In space straight K space equals space fraction numerator increment straight H to the power of straight o minus straight T increment straight S over denominator RT end fraction
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    309.

    The standard reduction potentials for Zn2+/ Zn, Ni2+/ Ni, and F2+/ Fe are –0.76, –0.23 and –0.44 V respectively. The reaction X + Y2+ → X 2+ + Y will be spontaneous when

    • X = Ni, Y = Fe

    • X = Ni, Y = Zn

    • X =Fe, Y= Zn

    • X =Fe, Y= Zn

    206 Views
    Answer
    310.

    The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27°C is

    • 38.3 J mol-1 K-1

    • 35.8 J  mol-1 K-1

    • 32.3 J  mol-1 K-1

    • 32.3 J  mol-1 K-1

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