# Problem: How many moles of Kr are contained in 398 mg of Kr?     A) 4.75 × 10 -3 moles KrB) 1.19 × 10 -4 moles KrC) 2.99 × 10 -3 moles KrD) 33.4 moles KrE) 2.11 × 10 -4 moles Kr

82% (58 ratings)
###### Problem Details

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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mole Concept concept. You can view video lessons to learn Mole Concept. Or if you need more Mole Concept practice, you can also practice Mole Concept practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofHow many moles of Kr are contained in 398 mg of Kr?     A) 4...as low difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Sabrina took 1 minute and 51 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Alghoul's class at GSU.