Give the % composition of all elements in these compounds. (NH4)2 S Molar Mass=

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

In 2002, the rare earth elements mine in mountain pass, california was closed because

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.