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

12.8 mol

Explanation:

Hello,

In this case, given the reaction, one should use the molar mass of water that is 18 g/mol in order to perform the following stoichiometric calculation wherein the oxygen to water molar ratio is 1:2 respectively:

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answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.