anonymous
  • anonymous
It takes 3.2 × 10^3 J of heat to melt an amount of gold (△Hf = 6.30 × 10^4 J/kg). How much gold do you have? 0.051 g , 0.51 g , 19 g , or 51 g ?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Michele_Laino
  • Michele_Laino
please, for previous answer, I think inert gas, so not plasma
Michele_Laino
  • Michele_Laino
inert gas means a gas composed by neutral atoms
anonymous
  • anonymous
ohh okay! so gas is the solution?

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Michele_Laino
  • Michele_Laino
yes!
anonymous
  • anonymous
ookay!! yay!! what about this one?
Michele_Laino
  • Michele_Laino
here we have to compute this: \[m = \frac{Q}{{\Delta {H_f}}}\] where m is the mass of melted gold
anonymous
  • anonymous
ok! what do we plug in? :/
Michele_Laino
  • Michele_Laino
hint: \[m = \frac{Q}{{\Delta {H_f}}} = \frac{{3.2 \times {{10}^3}}}{{6.3 \times {{10}^4}}}\]
anonymous
  • anonymous
okay! so we get 0.0507 so our solution is 0.051 g ?
Michele_Laino
  • Michele_Laino
no, it is 0.051 Kg
anonymous
  • anonymous
ohh and so converted to g that becomes 0.51 g? :/
anonymous
  • anonymous
i forget the conversoins :/
Michele_Laino
  • Michele_Laino
no, it is 0.051*1000=...grams
anonymous
  • anonymous
ohh right so our solution is 51 g ? :O
Michele_Laino
  • Michele_Laino
yes!
anonymous
  • anonymous
yay! thank you:)
Michele_Laino
  • Michele_Laino
:)

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