30 points WILL MARK BRAINILEST PLEASE HELP If Captain Kirk finds a new element, Kirkium, on Planet Vulcan that is composed of the following isotopes: 13.6% Kirkium-248 (247.82 u), 22.9% Kirkium-250 (249.78 u), and 63.5% Kirkium-254 (253.72), what is the average atomic mass of Kirkium?

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

Count the number of each type of atom in the equation below, and then balance the equation. write in the numbers of atoms and coefficients. add a 1 if there should be no coefficient. cs2(l) + o2(g) → co2(g) + so2(g) c [ ] s [ ] o > c [ ] s [ ] o [ ] cs2(l) + [ ] o2(g) > [ ] co2(g) + [ ] so2(g)

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?