Dr bob can you help with my last question for tonights home work please

Question

A gas mixture consists of equal parts of methane(molecular weight 16.0) and argon (atomic weight40.0). if the partial pressure of argon is 26.6 kPa what is that of methane in the same units?
10.7
26.7
66.7
34.1
Thanks as I am confused between whether to choose 66.7 or 26.7
Andy

Answer 1

Don't guess. Calculate it. I have posted the work below. By the way, I want to address a remark you made last night about "How do you remember all this stuff?"
Early on in chemistry there is a lot of stuff that we must take on faith so we memorize it. Things like symbols, conversions, units, and things like that.So the memory part of our brains plays a very important part, especially in the early stages of getting chemistry. But as time marches on we begin to understand exactly what is going on. The more we understand, the less we need to memorize. So the answer really is that many many answers can be reasoned out; therefore, we understand them and don't memorize them. That frees up a few brain cells for those memory things that are essential. Practice makes perfect.

Answer 2

Thanks Dr bob
my brain hurts about this stuff as i try to memorise too much....
thanks for your advice and maybe one day it will all come clear and until then i am still waiting for my AHA...moment sorry till then i need help ....thats why god put brilliant and patient teachers such as you on the face of the earth...and at jiskha homework....
Regards andy