A sample of an element has a mass of 80.01g and a density of 2.70 g/cm3. How many significant figures does the mass have?

V1t2 = v2t1 is an expression of who’s law

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.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?