A laboratory analysis of an unknown sample yields 63.12% carbon, 8.85% hydrogen, and 28.03% oxygen. What is the empirical formula of the sample?

Classify each statement about effective nuclear charge, zeff, as true or false.

Match each object to its description: a. coma of a comet b. comet tail c. oort cloud haze surrounding a nucleus created by solar wind. hypothetical sphere around the solar system

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