Question

Argentite (Ag2S) is one of the common ores of silver. If you would like to get 26.2 moles of silver, how many kilograms of Ag2S are needed?

___________ kg Ag2S. Do NOT enter the unit and report your final answer with 3 SFs.

I actually don't know how to do this just being honest. Could anyone help me?

Answer 1

There are 2 mols of Ag in every mol of Ag2S
26.2 mols of Ag is therefore 13.1 mols of Ag2S
a mol of Ag2S is 2*107.87 + 32.06 = 247.8 grams
we need 13.1 *247.8 = 3246.2 grams
= 3.25 kg

Answer 2

I am so sorry there's a mistake on the question instead of the 26.2 it should be 21.9

Answer 3

so just do what I did with the new number :)

Answer 4

Could you explain how did you get 13.1 mols? I am still having hard time with this lol

Answer 5

there are 2 mols of Ag in every mol of Ag2 whatever
because
there are 2 Ag atoms in every molecule of Ag2 whatever