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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 ?
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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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1please, for previous answer, I think inert gas, so not plasma

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1inert gas means a gas composed by neutral atoms

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohh okay! so gas is the solution?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ookay!! yay!! what about this one?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1here we have to compute this: \[m = \frac{Q}{{\Delta {H_f}}}\] where m is the mass of melted gold

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok! what do we plug in? :/

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1hint: \[m = \frac{Q}{{\Delta {H_f}}} = \frac{{3.2 \times {{10}^3}}}{{6.3 \times {{10}^4}}}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay! so we get 0.0507 so our solution is 0.051 g ?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1no, it is 0.051 Kg

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohh and so converted to g that becomes 0.51 g? :/

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i forget the conversoins :/

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1no, it is 0.051*1000=...grams

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohh right so our solution is 51 g ? :O
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