Question

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 ?

Answer 1

please, for previous answer, I think inert gas, so not plasma

Answer 2

inert gas means a gas composed by neutral atoms

Answer 3

ohh okay! so gas is the solution?

Answer 4

yes!

Answer 5

ookay!! yay!! what about this one?

Answer 6

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

Answer 7

ok! what do we plug in? :/

Answer 8

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

Answer 9

okay! so we get 0.0507

so our solution is 0.051 g ?

Answer 10

no, it is 0.051 Kg

Answer 11

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

Answer 12

i forget the conversoins :/

Answer 13

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

Answer 14

ohh right so our solution is 51 g ? :O

Answer 15

yes!

Answer 16

yay! thank you:)

Answer 17

:)