Caffeine’s molecular formula is C8H10N4O2. the molar mass of caffeine is 194 g/mol. what is the percentage of oxygen in caffeine? a) 8.2%
b) 16.5%
c) 28.9%
d) 49.5%

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid

What energy is it when you flip on a switch on a lamp