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Estimate the melting point of nickel, Ni, if its ∆fusH is 17.61 kJ/mol and its ∆fusS...

Estimate the melting point of nickel, Ni, if its ∆fusH is 17.61 kJ/mol and its ∆fusS is 10.21 J/mol·K. (Compare this to a measured melting point of 1455◦C.)

Solutions

Expert Solution

Melting point of nickel is , T = ∆fusH / ∆fusS

Given that ∆fusH = 17.61 kJ/mol

                        = 17.61x103 J/mol

                ∆fusS = 10.21 J/mol·K

So melting point is , T = (17.61x103 J/mol) / (10.21 J/mol·K)

                                 = 1724.7 K

                                 = 1724.7 - 273 K

                                 = 1451.7 oC

Therefore the theoretical metling point is 1451.7 oC

Given the measured melting point of 1455oC

So the measured melting point is higher than the actual value.

queen_honey_blossom answered 4 months ago
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