How do you use the equation D= m over v to solve for density?

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.

Sheela and her brother hari were sitting in the living room, watching tv. suddenly hari said that he thinks something is burning in the other room. how did he get the burning smell?

Ashell can hold a maximum of 32 electrons, what is the value of n?