How many moles of Kr are contained in 398 mg of Kr?
A) 4.75 × 10 -3 moles Kr
B) 1.19 × 10 -4 moles Kr
C) 2.99 × 10 -3 moles Kr
D) 33.4 moles Kr
E) 2.11 × 10 -4 moles Kr
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