What is the molarity of a 5.00x10^2 ml solution containing 21.1 g of potassium bromide (kbr)? the molar mass of kbr is 119.0 g/mol.

a)3.55x10−4m
b)42.2m
c) 0.355 m
d)8.87∗10−2

Which piece of equipment would me most useful for measuring the volume of some water? a. pan balance b. graduated cylinder c. tweezers d. flask quick

Identify the electromagnets with poles that are reversed from the electromagnet shown above

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?