How long would it take a 20 g sample of Thorium-234 to decay into only 5 grams of Thorium-234

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.

In one or two grammatically correct sentences, write a definition for the term molecule geometry

Which of the following will cause an increase in the acceleration of an object? increase force decrease force increase mass decrease mass