Given the reaction 2 H2 + O2 → 2 H2O, how many moles of oxygen would be consumed if 460 g of water were produced?
5.6 mol
12.8 mol
23.9 mol
46.1 mol

Ineed to find the answer of this question because i dont understand it

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?