A sample of a compound containing Co is analyzed to show the presence of 68.11% Co by mass. It is found there are six Co atoms per molecule of the compound. What is the molar mass of the compound?

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]