Note: Data is the plural of datum. Apostrophe not needed.
Let Sr = sulfur rhombic and Sm = sulfur monoclinic.
You don't specify which is which; however, check your data.
I found Sr + O2 ==> SO2(g) dH = -296.06
......... Sm + O2 --> SO2(g) dH = -296.36.
If we assume your data to be mean #1 is monoclinic
.........Sm + O2 ==> SO2(g) dH = -295.1 and #2 to be rhombic so
........Sr + O2 ==> SO2(g) dH = -296.
Take equation 1 and add to the reverse of equation 2 like this.
.............Sm + O2 ==> SO2(g) dH = -295.1
.............SO2(g) ==> Sr + O2 dH = +296
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...........Sm ==> Sr -295.1 + 296 = +?
If I have assumed incorrectly you can easily change the two equations and get your answer. Again, please check your numbers.
calculate the enthalpy change for the allotropic transformation of sulphur in the monoclinic form to sulphur in the rhombic form from the following data's
1.S+oxygen gives sulphurdioxide,Delta H is equal to-295.1KJ
2.sulphur +oxygen gives sulpherdioxide,Delta H is equal to -296.KJ
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