Balance this equation please!!

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.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Classify this reaction: 2al+n2-> aln.