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In this video, I will show you how to solve mole-mole ratio problems.
To help you identify a mole-mole ratio problem, there is usually the question, or problem
as well as an associated reaction, or equation.
And since we're dealing with a ratio, we can go ahead and set up a proportion with the
numerators coming from the question and the denominators coming from the equation.
And just in case you may not know which formulas are which, there may just be a short paragraph
included that helps you out.
Since we are trying to determine the number of moles of sodium hydrogen carbonate, we'll
make the first numerator "X".
Sodium hydrogen carbonate by the way, has the formula NaHCO3.
0.010 will be the other numerator which represents the moles of citric acid, whose formula is
H3C6H5O7.
We'll now turn to the sodium hydrogen carbonate and citric acid in the equation to get the
numbers for the denominators, which is nothing more than the numbers written directly in
front of the respective formulas. If no coefficient is written, a 1 is understood to be there.
To solve for x, simply cross multiply so that x equals 3 x 0.010, or 0.030 moles.
Here's another example for you to try on your own!
When you are done, write your answer in the comments section below this video.
Then, head on over to chemvideotutor.com/answers-to-video-questions to see if you answered it correctly.
Thank you for watching!