Calculate the percent mass of hydrogen in ethane (C2H6).

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.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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