[remeday86]

I made an effort to solve the problem but I am not sure.

A particular metallic element, M, has a heat capacity capacity of (0.36 J/gk, and it forms an oxide that contains 1.72 grams of M per gram of oxygen.

a) Using law of Dulong and Petit (Cp x M = 25 J/gk), estimate molar mass of the metal M. _____ g/mol

--what I did:

M = 25 J/gk / Cp
M = ( 25 J/gk)/ (0.36 J/ gk) = 69.4 gM / gO
so..
69.4 gM/gO x (1.72 g/mol) = 119.4 g/mol (<---absolutely not sure!)


b) Then from the composition of oxide (1.72 g M/g O) and molar mass of oxygen (16.0 g/mol), determine the mass of M that combines with each mole of oxygen. _____ g M/ mol O

--this is what i did:

119.4 g/mol x (1 g M/gO / 16.0 g/mol) x (1 g M/mol O / 1.72 g M/g O)
=4.34 g M/ mol O


C) then determine the Empirical formula of oxide using information in (a) and (b).

Since I don't know if my answers are correct, I am not sure how to write the empirical formula as well..

[remeday86]

nvm! I understand it now