# Chemistry 1046

posted by .

A metal, M, of atomic mass 91 amu reacts with fluorine to form a salt that can be represented as MFx. In order to determine x and therefore the formula of the salt, a boiling point elevation experiment is performed. A 9.05-g sample of the salt is dissolved in 100.0 g of water and the boiling point of the solution is found to be 374.54 K. Find the formula of the salt. Assume complete dissociation of the salt in solution.

• Chemistry 1046 -

assume it is MF3. then

bpe=.52*4*9.05/(.1*(91+3*19))
bpe=18.8/(14.8)=1.2 check that.

Is that equivalent to a new bp of 374.54K?

• Chemistry 1046 -

It is not... So where do I go from here?

• Chemistry 1046 -

You're right. It isn't MF3.
Do it this way.
delta T = i*Kb*m
If you let MFx ionize into M + xF, then
molar mass is 91+19x and
m = 90.5g/(91+19x)
Substitute delta T, for i substitute x+1, then Kb and m. Solve for x.

• Chemistry 1046 -

• Chemistry 1046 -

ZrF4 is wrong.

• Chemistry 1046 -

This is an OLD question but I'm having trouble on it... *sigh*

## Similar Questions

1. ### Chemistry

The steps to getting the answer. A certain metal oxide has the formula MO where M denotes the metal. A 39.46g sample of the compound is strongly heated in an atmosphere of hydrogen to remove oxygen as water molecules. At the end, 31.70g …
2. ### chemistry

Which of the following properties increase with increasing atomic number for fluorine and chlorine?
3. ### chemistry

Which of the following properties increase with increasing atomic number for fluorine and chlorine?
4. ### Chemistry

A metal, , of atomic weight 96 reacts with fluorine to form a salt that can be represented as . In order to determine and therefore the formula of the salt, a boiling point elevation experiment is performed. A 9.18- sample of the salt …
5. ### Chemistry

A metal, , of atomic weight 96 reacts with fluorine to form a salt that can be represented as . In order to determine and therefore the formula of the salt, a boiling point elevation experiment is performed. A 9.18- sample of the salt …
6. ### CHEM

A metal, M, of atomic mass 91 amu reacts with fluorine to form a salt that can be represented as MFx. In order to determine x and therefore the formula of the salt, a boiling point elevation experiment is performed. A 9.05-g sample …
7. ### Chemistry

Naturally occurring boron is 80.20% boron-11 (of atomic mass 11.01 amu) and 19.80% of some other isotope form of boron. What must be the atomic mass of this second isotope in order to account for the 10.81 amu average atomic mass of …
8. ### chemistry

Suppose that you wanted to be sure that a metal ion, any metal ion, would dissolve in water. What salt of the metal ion compound would you choose?
9. ### Chemistry

If 2.00 g of element G reacts with 5.00 g of element M to produce 7.00 g of a compound with the formula G3M2, what is the atomic mass of G if the atomic mass of M is 135.0 amu?
10. ### Chemistry

A metal, M, of atomic weight 96 u reacts with fluorine to form a salt that can be represented as MFx. In order to determine x and therefore the formula of the salt, a boiling point elevation experiment is performed. A 10.9 g sample …

More Similar Questions