What information does the percent composition of an atom in a molecule give? a. The total mass that element contributes to a molecule give b. the relative number of atoms one element contributes to a molecule c. the total number of atoms of that element in a molecule d. the relative amount of mass an atom contributes to a molecule

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

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?

How can the number of core electrons be determined from the periodic table