A) \[-105\text{ }kJ/mol\]
B) \[-77.4\text{ }kJ/mol\]
C) \[105\text{ }kJ/mol\]
D) None of these
Correct Answer: A
Solution :
[a] Given that \[MgS{{O}_{4}}(s)+n{{H}_{2}}O\to MgS{{O}_{4}}n{{H}_{2}}O;\] \[{{\Delta }_{r}}{{H}_{1}}=-91.2kJ/mol\] ....(i) \[MgS{{O}_{4}}.7{{H}_{2}}O(s)+(n-7){{H}_{2}}O\to MgS{{O}_{4}}(n{{H}_{2}}O)\] \[{{\Delta }_{r}}{{H}_{2}}=13.8kJ/mol\] ...(ii) or \[\Delta {{H}_{hyd}}={{\Delta }_{r}}{{H}_{1}}-{{\Delta }_{r}}{{H}_{2}}\] equation (i) - (ii) \[=-91.2\text{ }kJ/mol-13.8\text{ }kJ/mol\] \[=-105kJ/mol\]You need to login to perform this action.
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