Week 9 Recitation Quiz Key

Week 9 Recitation Quiz Key - H 2 ( g ) CH 4 O ( l )...

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Week 9 Recitation Quiz Key Name: _____________________________________ Lab: ___________________ Instructions: Choose ONE (1) of the problems below. Answer the problem and be sure to show your work . One (1) point is awarded for your name. The remaining four (4) points are awarded for partial credit and full correctness. (a) Use the thermochemical equations shown below to determine the enthalpy for the reaction: N 2 H 4 ( l ) + H 2 ( g ) 2NH 3 ( g ) N 2 H 4 ( l ) + CH 4 O ( l ) CH 2 O ( g ) + N 2 ( g ) + 3H 2 ( g ) H=-166.5KJ 2NH 3 ( g ) N 2 ( g ) + 3H 2 ( g ) H=207KJ CH 4 O ( l ) CH 2 O ( g ) + H 2 ( g ) H=-292.5KJ N 2 H 4 ( l ) + CH 4 O ( l ) CH 2 O ( g ) + N 2 ( g ) + 3H 2 ( g ) H=-166.5KJ N 2 ( g ) + 3H 2 ( g ) 2NH 3 ( g ) H=-207KJ CH 2 O ( g ) +
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Unformatted text preview: H 2 ( g ) CH 4 O ( l ) H=+292.5KJ N 2 H 4 ( l ) + H 2 ( g ) 2NH 3 ( g ) H = -166.5 + -207 + 292.5 = - 81 kJ OR (b) Using the information on your STP sheet, determine the enthalpy for the reaction: C 12 H 22 O 11 ( s ) + 12 O 2 ( g ) 12 CO 2 ( g ) + 11 H 2 O ( g ) H rxn = n H f products - m H f reactants = (12* H f, (CO 2 ) + 11* H f (H 2 O(g))) ( H f (C 12 H 22 O 11 ( s )) + 12* H f O 2 ( g )) = (12*-393.5 + 11*-241.82) (-2221 + 12*0) = (-4722 + -2660.02) (-2221 + 0) = -5161 kJ...
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