3Fe + 4H2O 1Fe3O4 + 4H2 2.55 x 1025 molecules of H2O will combine with Fe to produce g H2.

124 g of Fe will combine with H2O to produce formula units of Fe3O4.

2.24 moles Fe will fully react with g of H2O.

78.0 g of H2O will react with Fe to produce formula units of Fe3O4.

9.25 x 1023 formula units of Fe will react with H2O to produce moles of H2.

Compare and contrast physical changes with chemical changes.

What effect might melting sea ice have for people who live in coastal areas?

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.