Question

If 8.63 grams of Aluminum oxide react with Nitric acid, how many grams of water will be produced?

Answer 1

Taking into account the reaction stoichiometry, 4.57 grams of H₂O are formed when8.63 grams of Al₂O₃ reacts with HNO₃.

Reaction stoichiometry

In first place, the balanced reaction is:

Al₂O₃ + 6 HNO₃  → 2 Al(NO₃)₃ + 3 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

• Al₂O₃: 1 mole
• HNO₃: 6 moles  
• Al(NO₃)₃: 2 moles
• H₂O: 3 moles

The molar mass of the compounds is:

• Al₂O₃: 102 g/mole
• HNO₃: 63 g/mole
• Al(NO₃)₃: 213 g/mole
• H₂O: 18 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

• Al₂O₃: 1 mole ×102 g/mole= 102 grams
• HNO₃: 6 moles ×63 g/mole= 378 grams
• Al(NO₃)₃: 2 moles ×213 g/mole= 426 grams
• H₂O: 3 moles ×18 g/mole= 54 grams

Mass of water formed

The following rule of three can be applied: if by reaction stoichiometry 102 grams of Al₂O₃ form 54 grams of H₂O, 8.63 grams of Al₂O₃ form how much mass of H₂O?

$mass H_{2} O=\frac{8.63 grams of Al_{2} O_{3} x54 grams of H_{2} O}{102 grams of Al_{2} O_{3}}$

mass of H₂O= 4.57 grams

Then, 4.57 grams of H₂O are formed when8.63 grams of Al₂O₃ reacts with HNO₃.

Learn more about the reaction stoichiometry:

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