Question

A)
One atom of lithium, Li, reacts with fluorine, F, to produce lithium fluoride, LiF
. The atomic mass oflithium is 7 amu. The mass of one atom of lithium fluoride is 45 amu. Which statement about thereaction is correct?
(1 point)
2
Lithium reacts with two atoms of fluorine, and the atomic mass of fluorine is 38 amu.
Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 19 amu.
Lithium reacts with two atoms of fluorine, and the atomic mass of fluorine is 19 amu.
Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.

Answer 1

45 − 7 = 38 amu of fluorine in the LiF unit. 38 amu corresponds to two fluorine atoms at 19 amu each. Therefore: Lithium reacts with two atoms of fluorine, and the atomic mass of fluorine is 19 amu.