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

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

How have the greenhouse gasses increased from the year 2000 to 2018

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.