Posted by priscilla on .
LEAD IS A SOFT, DENSE METAL WITH A SPECIFIC HEAT OF 0.028KCAL/KGC, A MELTING POINT OF 328.0C, AND A HEAT FUSION OF5.5KCAL/KG. HOW MUCH HEAT MUST BE PROVIDED TO MELT A 250.0KG SAMPLE OF LEAD WITH A TEMPERATURE OF 20.0C?
Figure the heat to heat if from 20C to the melting point (Q=mc deltaT)
Add the heat needed to melt it at the melting point (Q=heatfusion*mass)
I CAME UP WITH 1,640KCAL I AM RIGHT?
No. Break it down in to calculations as I laid out, and let me see them.
SCIENCE QUESTION -
A heat pump releases 60.0 Kcal as it removes 40.0 Kcal at the evaporate coils. How much work does this heat pump ideally accomplish