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Umnica [9.8K]
3 years ago
5

How many moles of Kr are contained in 398 mg of Kr?

Chemistry
1 answer:
bagirrra123 [75]3 years ago
8 0
The mass of 1 mole of an element is its atomic weight on the Periodic Table in grams.

1g = 1000mg

The mass of 1 mole of Kr = 83.80g Kr

Convert mg Kr to g Kr.

398mg Kr x (1g/1000mg) = 0.398g Kr

Convert g Kr to mol Kr.

0.398g Kr x (1mol Kr/83.80g Kr) = 4.75x10-3mol Kr
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