[112393]

Hey guys,

Hope everyone is having a good weekend.

My chemistry exam is coming up in a few days and I need a little help in one area.

I lost all my notes on mass-mass problems, so could someone help me out in explaining what it is and what the steps are?

If it makes it any easier you could answer this equation: 2Na(s) + Cl2(1) = 2NaCl(s)...How many grams of Cl2 are needed to react with 4.68g of Na?

Atleast I think that's a mass to mass question

Thanks a lot!

Zach

[Borek]

http://www.chembuddy.com/?left=balancing-stoichiometry&right=stoichiometric-calculations

[112393]

Thanks for the link.

I actually just found some of my notes for it.

For future reference to whoever wants to know this is the 'easiest' way to do a mass to mass calculation.

1) Balance your equation

2) convert grams of whatever your trying to find to moles.

3) convert moles of whatever you have to moles that you want to end up with. Do this via a mol ratio. The coefficient you want goes on top and one you have on bottom. Eg: mol that you haveX coefficient of element/compound you want to have/(divided by)co effeciant of element/compound you already have

4) now convert your mol of the product you were trying to find to grams(mass)

mass+molXmolar mass

Hopefully that explains it

Zach