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261.
Explain Gibb's Helmholtz equation.

Gibbs-Helmholtz equation is

The value of ∆G can be zero, positive or negative.

(i) If ∆G = 0, the reaction is in the state of equilibrium i.e. ∆H = T∆S.

(ii) If ∆G = – ve, the reaction is spontaneous in the forward direction.

(iii) If ∆G = +ve, the reaction is non-spontaneous i.e. reaction is spontaneous in the reverse direction.

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Long Answer Type

262. Explain the state of reaction when:
(a) ∆G < 0 (b) ∆G = 0 (c) ∆G > 0.

156 Views

Short Answer Type

263.

When ∆G is positive, the process is always non-spontaneous. Explain.

124 Views

Long Answer Type

264.

Prove that ∆G = –T∆S_total.

108 Views

265.

What is free energy change? Show that the change in free energy is equal to useful work done.
or
prove that –∆G = w_{(useful work)}

158 Views

Short Answer Type

266.

Predict the enthalpy change, free energy change and entropy change when ammonium chloride is dissolved in water and the solution becomes colder.

193 Views

267.

At $<pre>uncaught exception: Http Error #404 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 #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>$ , ice and water are in equilibrium and $increment straight H space equals space 6.00 space kJ space mol to the power of negative 1 end exponent$ for the process $straight H subscript 2 straight O left parenthesis l right parenthesis.$ Calculate $increment straight S$ for the conversion of ice to liquid water.

92 Views

268.

For the reaction
$2 NO left parenthesis straight g right parenthesis space plus space straight O subscript 2 left parenthesis straight g right parenthesis space space space rightwards arrow space space space 2 NO subscript 2 left parenthesis straight g right parenthesis comma$
calculate $increment straight G$ at 700K when enthalpy and entropy changes are -113 kJ mol^-1 and -145 JK^-1 mol^-1 respectively.

101 Views

269. The following data is known about ZnSO₄:

increment straight H space equals space 7.25 space kJ space mol to the power of negative 1 end exponent space and space increment straight S space equals space 7.0 space JK to the power of negative 1 end exponent space mol to the power of negative 1 end exponent

Calculate its melting point.

123 Views

Long Answer Type

270.

From the following values of ∆H and ∆S, decide whether or not these reactions will be spontaneous at 298 K:

Reaction A:
∆H = – 10.5 X 10³ J mol^–1∆S = + 31 JK^–1 mol^–1
Reaction B:
∆H = – 11.7 X 10³ J mol^–1 ;
∆S = –105 jK^–1 mol^–1.