6. A heating curve for a 150.0-g sample of an unidentified substance is mensib shown below. The sample was heated at a uniform rate. Temperature (C) Heating Curve 110 10.5 90. 70 50+ 30. (s) 19 10- -10- -30+ 0 50 100 150 200 250 300 350 400 450 Heat Added (J) dadua sdt ni que lliw sp What is the heat of fusion for this substance? A 0.33 J/g B. 1.0 J/g -150 100 100 150 nolf c. 2,500 J/g (C) nolds D. 7,500 J/g