It is a compound noun. Why? Because 'Back''Pack' is one word, but if you see how i structured it, it can be two. Back, as in your body part, and Pack as in a bag or container, you name it. And just a tip, compound means two words squished into one, ex. CupCake, FireWorks, BaseBall, BasketBall. But when you are typing it, of course, you wouldn't capitalize the first letter of the two words :)
<span>no reactant is in excess
moles CO2 = 13.5
moles H2O = 13.5
moles Na3C6H5O7 = 13.5 / 3 =4.5
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Y = mx + c
c is the y-intercept
