Sulfur and fluorine react to form sulfur hexafluoride: If 50.0 g S is allowed to react as

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Sulfur and fluorine react to form sulfur hexafluoride:S(s) + 3 F(g)  SF(g)

If 50.0 g S is allowed to react as completely as possible with 105.0 g F2, what mass of the excess reactant is left?

a) 20.5 g S 

b) 45.7 g F2

c) 15.0 g S 

d) 36.3 g F2

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