Answer:
F=121.61 gr,
Step-by-step explanation:
we see that it is a problem of proportion, so then if the total mass of the sample is the sum of M plus fluorine
the sample weighs 1.38gr M + 0.71gr F = 2.09, where M y F represent :
M=1.38*100/2.09 = 66.02% and
F=0.71*100/2.09 = 33.97%, also
in 358 gr. * 0.3397F = 121.61 gr F
Answer:
See explanation
Step-by-step explanation:
Given two expressions

and

Substitute y = 5 into each expression:
1.

2.

As you can see the results are the same.
Please look at the attached file, it may help you