You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and ï„Hf for lead is 2.04 Ã— 104 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?

Question

You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and ï„Hf for lead is 2.04 Ã— 104 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?

bobpursley · Answer

heat= heataddedToIncreaseTemp+ heataddedToMelt = 2kg*CPb*(327.5-25)+2kg*Hf

Carlos Q · Answer

327.5x25.0=302.5 T= 302.5C q=2.00kg(130.0 kqc) (302.5c) q=H&M Q=78,650J Q=2.04x10^4 j/kg (2.00g)=40,800J Q=119,450J „³ 119,000J

You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and ï�„Hf for lead is 2.04 Ã— 104 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?