Jane and mark an H-R diagram and conclude that the sun is the brightest and hottest star within 20 light year of earth. Do you agree with their claim? Why or why not

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.