Specific heat of steel: 490 J/kg/K Specific heat of water: 4180 J/kg/K Heat of f

Question

Specific heat of steel: 490 J/kg/K Specific heat of water: 4180 J/kg/K Heat of fusion of steel: 126,000 J/kg Heat of evaporation of water: 334,000 J/kg 1370C Melting point of steel: 1370 C Boiling point of water: 100 C, A 450g block of steel is removed from a furnace at 1100 degree C and immediately dropped into an equal mass of water at 20 degree C. Use any of the information above to determine the percentage of water that boils away. If none of the water boils, write 0%. If all of it boils, write 100%.

Explanation / Answer

heat lost = heat gained

m1s1dT = m1s2dT2 + mLwater

450*490*(1100 - 100) = 450*4180*(100-20) + m*Lwater

2.205x10^8 = 1.505x10^8 + m*334000

m = 209.64 Kg

% water boils = (209.64/450)*100 = 46.58 %

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