The mass of a sulphur atom is 32.0 u, and the mass of a fluorine atom is 19.0 u. What is the mass of a mole of sulphur hexafluoride (UF6)?
A)41.0 g
B)20.5 g
C)106 g
D)146 g
E)211 g

Question

Quizplus · Accepted Answer

Sulphur hexafluoride (SF6) consists of one sulphur atom and six fluorine atoms. The mass of one sulphur atom is 32.0 u, and the mass of one fluorine atom is 19.0 u. Therefore, the mass of SF6 is 32.0 u + 6(19.0 u) = 32.0 u + 114.0 u = 146.0 u. Since 1 mole of a substance has a mass in grams equal to its molecular mass in atomic mass units, the mass of a mole of SF6 is 146 g.

The Mass of a Sulphur Atom Is 32