The study of the structure of matter and the composition of substance, their properties, and their chemical reactions is called

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

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