How many atoms are in a sample of 0.585 moles of krypton (Kr)?

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?

Ahelium balloon contains 16.9 l of helium at stp. how many atoms of helium are in the balloon