How many atoms of Bi are there in a 41.8 g sample?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

The gulf stream is a warm water current that flows away from the equator to northern europe. witch of these does it cause. a. crashes of warm and cool water in the ocean b.colder climates near the equator c.large waves on the cost of europe d.warm climates in northern europe