How many moles are there in 8.17 x 10²⁸ molecules of H₂O?

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

Astudent completes a titration by adding 12.0 milliliters of naoh(aq) of unknown concentration to 16.0 milliliters of 0.15 m hcl(aq). what is the molar concentration of the naoh(aq)? 1)5.0 m 2)0.20 m 3)0.11 m 4)1.1 m

Helium decays to form lithium. which equation correctly describes this decay?