I cannot work out this baby question please Help me out!!!!!?

Question

A tube contains 1.2 g of SnF2

Calculate the mass of the fluorine in this tube of toothpaste?

Answer 1

did your baby eat a tube of toothpaste?

Answer 2

Take the ration of the atomic wt.s in the formula wt.

2 F/ 1 Sn.

Apply it to 1.2 G.

There you go.

find the wt.s @ webelements.com

(Good chem. resource).

Answer 3

Molecular weight = 156.7

Sn - 118.7

F - 19 (x2) (38)

Total = 156.7

1.2/156.7 = 0.00766

0.00766 x F mass (19x2) = 0.29g

Answer 4

atomic wt of

Sn=118.7

F2=  38

    =156.7

the mass of the fluorine in this tube of toothpaste=

[38/156.7] x1.2=0.2910019  g

Answer 5

Baby question?

Anyway....It contains one part Sn to 2 parts F

So..1.2 divided by 3 = 0.4 x 2 = 0.8 g

Answer 6

Baby question??

Answer 7

[38/156.7] x1.2=

0.2910019 g

or290mg

So simple

Answer 8

confused?

Answer 9

Percentage by mass of F2 in SnF2 = 2(F)/[(Sn)+2(F)]

= 2(19.00)/(118.7+38.00) X 100 %

= 38.00/156.7 X 100 %

= 24.25 %

Unitary Method

24.25 g of F are there in 100 g of SnF2

so therfore 24.25/100 X 1.2 =0.2910 g of fluorine are in this tube of toothpaste