Once Billy and Susie have the unobtanium at the melting point, how much heat must be absorbed to melt all the unobtanium? (heat of fusion: ΔHfus = 50.3 kJ/mol; molar mass 322.03 g/mol) Unobtanium=
q= 13,240 J
m= 78.9 g
Cp= 1.87 J/g*C
ΔT= 109*C-18.0*C

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so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer