Posted by echem on Friday, March 12, 2010 at 11:58pm.
moles = grams/formula unit mass
0.660 = 131.9 g/formula unit mass
solve for formula unit mass
131.9 g * (0.66mol)/(6.022*10^23) =1.4455*10^(-22)formula unit I don't think that's right....
I don't think it is either. Where did you get 6.02 x 10^23 and why use it at all?
I gave you the formula.
0.660 = 131.9/formula unit mass.
formula unit mass = 131.9/0.660. Now divide that and see what you get.
I get 199.848 but I'm pretty sure its suppose to be a small number...
Here's a similar problem that I have the answer to but I don't know how to do...
An 0.4200 mol sample of a metal has a mass of 9.656 g. Determine the mass (g) of one atom of the element. Express answer in scientific notation.
Ans:3.818x10^(-23) grams
I think if I know how to get this answer I can get the answer to the other one
oh i got it!!
(9.656/0.4200)/(6.022E-23)= 3.810E-23
so I do the same thing for the other problem!
Thank you for you help :)
199.8 = formula mass is correct, at least from the date you posted. For the other problem.
moles = g/molar mass.
0.420 = 9.656/molar mass.
molar mass = 9.656/0.420 = 22.99.
So far that's the same problem we just solved. For the mass of 1 atom you take 22.99 and divide by 6.022 x 10^23 = 3.818 x 10^-23 grams.
Related Questions
ap chemistry - 18. Answer the following question that relate to the analysis of ...
chemistry - if one can find the ratio of the number of moles of the elements in ...
chemistry - A solution was made by dissolving 62.07 grams of a compound in 500.0...
Chemistry - I did the work, but I need help checking it... A compound contains ...
Chemistry - Determine the mass of a nonvolatile, nonionizing compound that must ...
chemistry - A solution was made by dissolving 62.07 grams of a compound in 500.0...
AP Chemistry - 1.A compound consists of 65.45% C, 5.492% H, and 29.06% O on a ...
AP Chemistry - An unknown compound contains only the three elements C,H, and O. ...
Chemistry - A sample weighing 3.064 g is a mixture of Fe2O3 (molar mass = 159.69...
Chemistry - I need some help with some of these questions: The action of ...
For Further Reading
