Given the following reaction: Fe3O4(s) + 4H2(g) --> 3Fe(s) + 4 H2O (l), if 16 mol of H2 are used, how many moles of Fe will be produced? Group of answer choices

3 moles

9 moles

6 moles

12 moles

Compare and contrast physical changes with chemical changes.

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.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?