The mass% of F in binary compound KrF2?

0 ⤊

is_____
a.18.48
b.45.38
c.68.80
d.81.52
e.31.20

2007-05-04 18:38:47 · 3 answers · asked by Mary 1 in Science & Mathematics ➔ Chemistry

Molecular mass KrF2 = 121.8 g/mol

Mass F2 = 37.997 g/mol

37.997 : 121.8 = x : 100

x = 31.20 %

2007-05-04 22:57:21 · answer #1 · answered by Anonymous · 0⤊ 0⤋

Find the atomic weight of krypton and fluorine.
Then mass percent = 2x fluorine atomic wt x 100
divided by mole wt of KrF2.

2007-05-05 01:42:47 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋

2007-05-07 00:13:20 · answer #3 · answered by unik g 1 · 0⤊ 0⤋