## 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 ?

1. Michele_Laino

2. Michele_Laino

inert gas means a gas composed by neutral atoms

3. anonymous

ohh okay! so gas is the solution?

4. Michele_Laino

yes!

5. anonymous

6. Michele_Laino

here we have to compute this: $m = \frac{Q}{{\Delta {H_f}}}$ where m is the mass of melted gold

7. anonymous

ok! what do we plug in? :/

8. Michele_Laino

hint: $m = \frac{Q}{{\Delta {H_f}}} = \frac{{3.2 \times {{10}^3}}}{{6.3 \times {{10}^4}}}$

9. anonymous

okay! so we get 0.0507 so our solution is 0.051 g ?

10. Michele_Laino

no, it is 0.051 Kg

11. anonymous

ohh and so converted to g that becomes 0.51 g? :/

12. anonymous

i forget the conversoins :/

13. Michele_Laino

no, it is 0.051*1000=...grams

14. anonymous

ohh right so our solution is 51 g ? :O

15. Michele_Laino

yes!

16. anonymous

yay! thank you:)

17. Michele_Laino

:)