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2 years ago

Hello rainfaeries ~help me with these questions

Chemistry

2 answers:

zimovet [89]2 years ago

7 0

Answer:

Ans) Calcium hydroxide is produced by the reaction of water and calcium oxide also called slaked lime.

CaO + H2O → Ca(OH)

Ans) When Calcium Hydroxide reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, it produces Calcium Carbonate (CaCO3), which creates a hard coating on the walls. That's why Calcium Hydroxide is used in white washing.

goblinko [34]2 years ago

4 0

Explanation:

Calcium hydroxide is produced commercially by treating lime with water: CaO + H2O → Ca(OH) In the laboratory it can be prepared by mixing aqueous solutions of calcium chloride and sodium hydroxide.

Quicklime is used for whitewashing as it produces calcium hydroxide (CaOH) when it reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, as a result, it produces calcium carbonate (CaCO3) which creates a hard coating on the walls.

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Answer:

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Explanation:

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<em>Ammonium phosphate ((NH₄)₃PO₄) is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H₃PO₄) with ammonia (NH₃). What mass of ammonium phosphate is produced by the reaction of 4.9 g of phosphoric acid? Be sure your answer has the correct number of significant digits.</em>

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Step 1: Write the balanced equation

H₃PO₄ + 3 NH₃ ⇒ (NH₄)₃PO₄

Step 2: Calculate the moles corresponding to 4.9 g of phosphoric acid

The molar mass of phosphoric acid is 98.00 g/mol.

$4.9 g \times \frac{1mol}{98.00g} = 0.050mol$

Step 3: Calculate the moles of ammonium phosphate produced from 0.050 moles of phosphoric acid

The molar ratio of H₃PO₄ to (NH₄)₃PO₄ is 1:1. The moles of (NH₄)₃PO₄ produced are 1/1 × 0.050 mol = 0.050 mol.

Step 4: Calculate the mass corresponding to 0.050 moles of ammonium phosphate

The molar mass of ammonium phosphate is 149.09 g/mol.

$0.050mol \times \frac{149.09 g}{mol} = 7.5 g$

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Hello rainfaeries ~help me with these questions ​

Hello rainfaeries ~help me with these questions