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anonymous
 one year ago
How much heat does it take to melt 2.5 kg of lead when it is at its melting point (m.p. = 327.5ºC; ∆Hf = 2.04 * 10^4 J/kg) ?
A. 6.2 × 10^1 J
B. 8.2 × 10^3 J
C. 5.1 × 10^4 J
D. 1.7 × 10^7 J
**thank you!:)
anonymous
 one year ago
How much heat does it take to melt 2.5 kg of lead when it is at its melting point (m.p. = 327.5ºC; ∆Hf = 2.04 * 10^4 J/kg) ? A. 6.2 × 10^1 J B. 8.2 × 10^3 J C. 5.1 × 10^4 J D. 1.7 × 10^7 J **thank you!:)

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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2is \Delta H the enthalpy change?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i am not sure :/ i think so... it looks like this dw:1432830397213:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i did not type the subscript clearly!

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2I think that it is the fusion enthalpy change

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2so, I think that the requested amount Q of heat is given by the subsequent computation: \[\Large Q = \Delta {H_f} \times m = ...Joules\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay, so i plug in like this? 2.04 * 10^4 * 2.5 ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yay! so we get 51000? so the answer is choice C? 5.1 * 10^4 J ?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2Thank you!!!!! :)
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