Sodium-24, which is used to locate blood clots in the human circulatory system, has a half-life of 15.0 h . A sample of sodium-24 with an inital mass of 11.0 g was stored for 60.0 h . How many grams of sodium-24 are left in the sample after 60.0 h ?

How many grams of aluminum will there be in 98g of al2o3?

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.

How does the viscosity of magma change as magma cools?