The molecular formula for caffeine is c8h10n4o2. which of the following elements is not found in caffeine? carbon helium nitrogen oxygen

0.09 moles of sodium sulfate in 12 ml of solution

Ted and emily played a mixed doubles tennis match against jack and brenda. in the second match. ted and brenda played against jack and emily. which type of chemical reaction does the situation demonstrate?

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots