How much heat is needed to change 20g of liquid mercury at 20C into mercury vapo

Question

How much heat is needed to change 20g of liquid mercury at 20C into mercury vapor at the boiling point. Cmercury = 140J Tb(mercury)=357 Lv(mercury)=2.96x10^5j/kg heat of vaporization
How much heat is require to brng the liquid to boiling poing? How much heat is requiered to totally vaporize the liquid mercury ? What is the total heat required? How much heat is needed to change 20g of liquid mercury at 20C into mercury vapor at the boiling point. Cmercury = 140J Tb(mercury)=357 Lv(mercury)=2.96x10^5j/kg heat of vaporization
How much heat is require to brng the liquid to boiling poing? How much heat is requiered to totally vaporize the liquid mercury ? What is the total heat required? Cmercury = 140J Tb(mercury)=357 Lv(mercury)=2.96x10^5j/kg heat of vaporization
How much heat is require to brng the liquid to boiling poing? How much heat is requiered to totally vaporize the liquid mercury ? What is the total heat required?

Explanation / Answer

Heat required to bring the liquid to boiling point is given as

H1 = m Cmercury (357 - 20) = 0.020 (140) (337) = 943.6 J

Heat for vapourization = H2 = mL = 0.020 (2.96 x 105) = 5920 J

Total heat energy = H1 + H2 = 943.6 + 5920 = 6863.6 J

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