10. Ans:- Option (A) " 0.38 J/g.°C " is the correct answer.
Explanation :-
Heat evolve by water (q) = weight of water (w) x Heat capacity of water(C) x Change in temperature (Tfinal-Tinitial)
= 140.0 g x 4.182 J/g°C x (29.6 - 25.0)°C
= - 2693.208 J
Now,
Heat evolve by water (q) = Heat absorb by metal = 2693.208 J
Again,
Heat absorb by metal (q) = weight of metal (w) x Heat capacity of metal(Cm) x Change in temperature (Tfinal-Tinitial)
- 2693.208 J = 100.0 g x Cm x (29.6 - 100)°C
Cm = - 2693.208 J / (100.0 g x (29.6 - 100)°C)
Cm = 0.38 J/g.°C
Hence, Option (A) is the correct answer.
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12. Ans :- Option (B) " 139 g" is the correct answer.
Explanation :-
5314 KJ of heat produced by = 2 moles (that is 2 x 58.12 g) of butane
So,
6375 KJ of heat is produced by = 2 x 58.12 g x 6375 KJ / 5314 KJ
= 139.44 g of butane
Hence, Option (B) is the correct answer.
10. A 140.0-g sample of water at 25.0°C is mixed with 100.0 g of a certain...
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