Question 51 pts aluminum reacts with oxygen to produce aluminum oxide which can be used as an adsorbent, desiccant, or catalyst for organic reactions. a mixture of 82.49 g of aluminum and 117.65 g of oxygen is allowed to react. what is the mass of the excess reactant present in the vessel when the reaction is complete? report your answer to the appropriate number of significant figures.

45 grams

Explanation:

To calculate the moles, we use the equation:

a) moles of

b) moles of

According to stoichiometry :

4 moles of require = 3 moles of

Thus 3.1 moles of will require=  of

Thus is the limiting reagent as it limits the formation of product and is the excess reagent as (3.7-2.3)= 1.4 moles of will remain unreacted.

Mass of

Thus 45 g of will be present in the vessel when the reaction is complete.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons