Abox contains a mixture of small copper spheres and small lead spheres. the total volume of both metals is measured by the displacement of water to be 435 cm^3 and the total mass is 4.30 kg. what percent of the total volume of the spheres is copper?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Why is nh3 classified as a polar molecule

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?