Sulfur hexafluoride (SF6; molar mass 146.07 g/mol) is a very stable gas. It is formed by...
Sulfur hexafluoride (SF6; molar mass 146.07 g/mol) is a very stable gas. It is formed by direct synthesis from the elements according to the following reaction: S(s) + 3 F2 (g) → SF6 (g)
If 92 grams of SF6 is produced from the reaction of 115 grams of fluorine (molar mass 38.00 g/mol), what is the percentage yield of the reaction?
a. 62%
b. 78%
c. 80%
d. >100%
Homework Answers
1)
S(s) + 3 F2 (g) → SF6 (g)
114 g 146.07 g
114 g F2 -----------> 146.07 g SF6
115 g F2 -----------> ??
mass of SF6 produced = 115 x 146.07 / 114
= 147.35 g
actual yield = 92 g
% yield = (actual / theoretical) x 100
= (92 / 147.35) x 100
= 62 %
percentage yield = 62 %
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