The mass of an element is 27 and it's atomic number is 13. Give the composition of the nucleus of it's atom

What relationship exists between an enzyme and a catalyst?

What is the chemical formula for dihydrogen monoxide

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.