Methane has a constant composition of 25% hydrogen and 75% carbon. Using a value of 12 amu for a carbon atom and assuming that methane contains 2 hydrogen atoms and 1 carbon atom, determine the relative mass of a hydrogen atom.
Thank you for the opportunity to help you with your question!
This methane molecule has 2 hydrogens and 1 carbon. The carbon is 12 amu, and the problem tells us that methane as a whole is 75% carbon. We can use this information to find the mass of the WHOLE methane molecule.
(0.75)(x) = 12 amu
x = 16 amu
Now that we know the whole methane molecule is 16 amu, how much of that is made of hydrogens? 16 amu - 12 amu = 4 amu.
4 amu is all hydrogens. How many hydrogens are there? There are 2. So what is the mass of EACH hydrogen? 4 amu / 2 = 2 amu. There you go!
Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 23rd, 2015
Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.