A molten metal of mass 150 g is kept at its melting point 800oC. When

1.	A molten metal of mass 150 g is kept at its melting point 800oC. When it is allowed to freeze at the same temperature, it gives out 75,000 J of heat energy. (a) What is the specific latent heat of the metal ? (b) If the specific heat capacity of metal is 200 J kg−1 K−1, how much additional heat energy will the metal give out in cooling to −50o C ?
Answer» A molten metal of mass 150 g is kept at its melting point $800^{o} C$ . When it is allowed to freeze at the same temperature, it gives out 75,000 J of heat energy. (a) What is the specific latent heat of the metal ? (b) If the specific heat capacity of metal is $200 J k g^{- 1} K^{- 1}$ , how much additional heat energy will the metal give out in cooling to $- 50^{o} C$ ?

A molten metal of mass 150 g is kept at its melting point 800oC. When it is allowed to freeze at the same temperature, it gives out 75,000 J of heat energy. (a) What is the specific latent heat of the metal ? (b) If the specific heat capacity of metal is 200 J kg−1 K−1, how much additional heat energy will the metal give out in cooling to −50o C ?

Answer»

A molten metal of mass 150 g is kept at its melting point $800^{o} C$ . When it is allowed to freeze at the same temperature, it gives out 75,000 J of heat energy.

(a) What is the specific latent heat of the metal ?

(b) If the specific heat capacity of metal is $200 J k g^{- 1} K^{- 1}$ , how much additional heat energy will the metal give out in cooling to $- 50^{o} C$ ?

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