Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: chay722 on January 21, 2008, 06:43:04 PM
-
Two different oxides of manganese are compared:
1. black /63.19% by mass manganese/ 36.81% by mass oxygen
2. dark greeen/77.50% by mass manganese/ 22.50% by mass oxygen
Which pair of values when substituted for X and Y in the fraction below gives a result that illustrates the Law of Multiple Proportions?
(63.19/X) / (77.50/Y)
a. X-54.94 y=16
b. x=54.94 y=54.94
c. x=16 y=16
d. x=22.50 y=36.81
e. x=36.81, y=22.50
I think the answer is choice e because when you calculate it out it comes to 1/2 and all the other choices give random numbers you can't really round up but I don't see how this would illustrate the law of multiple proportions if it isn't even a whole number.
-
all the other choices give random numbers
This is no question of trial and error ;)
http://chemistry.about.com/library/weekly/aa012903a.htm
-
Yeah I've already seen that example, but thanks.
-
Well, your answer is correct, but you should be able to set up such equations without multiple choices. I am sure you can :)
-
:) Well, thank you.