AP Chemistry, Stoichemetry

[SexayMistahBee]

I'm stuck on this one problem:
26.5g of McCl2 to liters of 0.200 M (molarity) MgCl2 solution
I'm confused on the entire damn thing kinda :/

I would appreciate it if anyone would kinda walk me through the whole thing..?

thanks lots

 

[Koot]

So you want to find amount of liters of water to make said solution?

If so then you know the formula for molarity is:

M = moles/L (H2O)

So here you want L and you know M and moles (simple conversion).

L = moles/M

 

[Rsaccounttrader]

1) 26.5g*[atomic weight of Mg + 2(Atomic weight of Cl)]=moles of MgCl2
2) moles of MgCl2/x Liters=.200mol/1 Liter.

So your answer is the answer to part 1 divided by .200. Make sure to keep 3 significant figures throughout.

 

[koolestkid]

Ok so stoichiometry's the easy part. pretty soon you will be doing gas law stoichiometry, so I made you this flow chart to help you, it took me like an hour and a half and I made it just so I could share it with you, mine's in my notebook. so I hope it helps