Determine the density of a 23.4g block that when placed in 25.00mL of water that causes the water to rise to a level of 28.70mL?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

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 do i turn 2 s into one in the products