An unknown substance is reported to have the following composition: 21.2%N, 6.1%H, 24.2%S, and 48.5%O. If we assume there is 100 grams of the substance, how many moles of oxygen would there be?

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

How many absorptions would you expect to observe in the 13c nmr spectra of the following molecules? a) 3-chloropentane b) cis-4-methyl-2-pentene

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit