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Determine which of the following react...

Determine which of the following reactions at constant pressure represent surrounding that do work on the system environment :
(P) `4NH_(3)(g) + 7O_(2)(g) to 4 NO_(2)+ 6H_(2)O(g)`
(Q) `CO.O(g)+ 2H_(2)(g) to CH_(3)OH(l)`
(R) `C("s,graphite")+H_(2)O(g) to CO(g)+H_(2)(g)`
(S) `H_(2)O(s) to H_(2)O(l)`

A

R,S

B

Q and R

C

Q,S

D

P,Q and S

Text Solution

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The correct Answer is:
D
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Determine which of the following reactions at constant pressure represents surroundings that do work on the system: I. 4NH_(3)(g)+7O_(2)(g)rarr4NO_(2)(g)+6H_(2)O(g) II. CO(g)+2H_(2)(g)rarrCH_(3)OH(l) III. C(s,"graphite")+H_(2)O(g)rarrCO(g)+H_(2)(g) IV. H_(2)OrarrH_(2)O(l)

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Calculate the enthalpy of combustion of glucose from the follwoing data : C("graphite") +O_(2)(g) to CO_(2)(g) Delta_(r)H^(@) = -395.0 kJ H_(2)(g) + 1/2 O_(2)(g) to H_(2)O(l) Delta_(r)H^(@) = - 269.4 kJ 6C("graphite") + 6H_(2)(g) + 3O_(2)(g) to C_(6)H_(12)O_(6)(s) Delta_(r)H^(@) = -1169.9 kJ

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Balance the following chemical equations and identify the type of reaction involved : (a) Na(s) + S(s) to Na_(2)S(s) (b) H_(2)S(g) + O_(2)(g) to S(s) + H_(2)O(l) (c) Fe_(2)O_(3)(s) + CO(g) to Fe(s) + CO_(2)(g) (d) FeSO_(4)(s) to Fe_(2)O_(3)(s) + SO_(2)(g) + SO_(3)(g)

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