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anonymous

  • one year ago

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 ?

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  1. Michele_Laino
    • one year ago
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    please, for previous answer, I think inert gas, so not plasma

  2. Michele_Laino
    • one year ago
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    inert gas means a gas composed by neutral atoms

  3. anonymous
    • one year ago
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    ohh okay! so gas is the solution?

  4. Michele_Laino
    • one year ago
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    yes!

  5. anonymous
    • one year ago
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    ookay!! yay!! what about this one?

  6. Michele_Laino
    • one year ago
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    here we have to compute this: \[m = \frac{Q}{{\Delta {H_f}}}\] where m is the mass of melted gold

  7. anonymous
    • one year ago
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    ok! what do we plug in? :/

  8. Michele_Laino
    • one year ago
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    hint: \[m = \frac{Q}{{\Delta {H_f}}} = \frac{{3.2 \times {{10}^3}}}{{6.3 \times {{10}^4}}}\]

  9. anonymous
    • one year ago
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    okay! so we get 0.0507 so our solution is 0.051 g ?

  10. Michele_Laino
    • one year ago
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    no, it is 0.051 Kg

  11. anonymous
    • one year ago
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    ohh and so converted to g that becomes 0.51 g? :/

  12. anonymous
    • one year ago
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    i forget the conversoins :/

  13. Michele_Laino
    • one year ago
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    no, it is 0.051*1000=...grams

  14. anonymous
    • one year ago
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    ohh right so our solution is 51 g ? :O

  15. Michele_Laino
    • one year ago
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    yes!

  16. anonymous
    • one year ago
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    yay! thank you:)

  17. Michele_Laino
    • one year ago
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    :)

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