anonymous
  • anonymous
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!:)
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Michele_Laino
  • Michele_Laino
is \Delta H the enthalpy change?
anonymous
  • anonymous
i am not sure :/ i think so... it looks like this |dw:1432830397213:dw|
anonymous
  • anonymous
i did not type the subscript clearly!

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Michele_Laino
  • Michele_Laino
I think that it is the fusion enthalpy change
anonymous
  • anonymous
ohh okay! :)
Michele_Laino
  • Michele_Laino
so, I think that the requested amount Q of heat is given by the subsequent computation: \[\Large Q = \Delta {H_f} \times m = ...Joules\]
anonymous
  • anonymous
okay, so i plug in like this? 2.04 * 10^4 * 2.5 ?
Michele_Laino
  • Michele_Laino
yes!
anonymous
  • anonymous
yay! so we get 51000? so the answer is choice C? 5.1 * 10^4 J ?
Michele_Laino
  • Michele_Laino
that's right!
anonymous
  • anonymous
yay! Thank you:D
Michele_Laino
  • Michele_Laino
Thank you!!!!! :)

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