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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: nismo on July 03, 2004, 12:27:55 AM

Title: mass/mole/density problem
Post by: nismo on July 03, 2004, 12:27:55 AM

this is killing me. my teacher doesent actually teach us, he just gives us the problems and expects us to know how to do it or look it up in the book and try and figure it out. well i cant find this anywhere, and i stumbled upon this place so i figured id give it a shot.

large numbers are coeff. numbers in () are sub scripts.

1) when a mixture of silver metal and sulfur is heated, silver sulfide is formed:

16Ag + S(8) --> 8Ag(2)S

        a) what mass of Ag(2)S is produced from a mixture of 2.0g of Ag and 2.0g of S(8)?
        b) what mass of which reactant is left unreacted??

and here is another if you care to take a look at it

2) gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00 L of argon at standard conditions?


I also have a couple of more that i can post if you're bored and wanna put your brain to work, cause all it's doing is hurting mine  :(

Title: Re:mass/mole/density problem
Post by: Donaldson Tan on July 03, 2004, 02:20:52 PM

first refer to this link:
http://www.chemicalforums.com/index.php?board=2;action=display;threadid=58

Title: Re:mass/mole/density problem
Post by: Donaldson Tan on July 07, 2004, 04:12:58 AM

1) Determine which substance (Ag or Sulphur) is in excess

2) Argon gas is monoatomic. Just convert 1.40g to number of moles.