converting 500.0 g to kg
500g 1kg
——— ———
1000g
500/1000 = .5kg
Utilize your heat transfer equation
Q = mc(delta T)
3.25x10^3 J = (.5kg)(what we are looking for)(50 degree change)
Rearranging we get
Q
__ = c
(m)(delta T)
so
3.25x10^3 J
________ = 130 J/kg•K
(.5kg)(50 K)
The substance should be Gold!!