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I just want to check to see if the answer my child has is right.​

I just want to check to see if the answer my child has is right.​-example-1
User Svenmarim
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1 Answer

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Answer:

2= Moles of SO₂ produced from 0.356 moles of PbS = 0.356 mol

3= Mass of hydrogen = 0.45 g

3= Mass of oxygen = 3.616 g

4 = Theoretical yield of P₂O₅ = 14.2 g.

Step-by-step explanation:

Q2= Given data:

Moles of PbS = 0.356 mol

Moles of PbO = ?

Moles of SO₂ = ?

Solution:

Chemical equation:

2PbS + 3O₂ → 2PbO + 2SO₂

Now we will compare the moles of PbS with PbO and SO₂ from balanced chemical equation.

PbS : PbO

2 : 2

0.356 : 0.356

Moles of PbO produced from 0.356 moles of PbS = 0.356 mol

PbS : SO₂

2 : 2

0.356 : 0.356

Moles of SO₂ produced from 0.356 moles of PbS = 0.356 mol

Q= 3

Given data:

Mass of water = 4.05 g

Mass of hydrogen = ?

Mass of oxygen = ?

Solution:

Chemical equation:

2H₂O → 2H₂ + O₂

Number of moles of water:

Number of moles of water = mass/ molar mass

Number of moles of water = 4.05 g/ 18 g/mol

Number of moles of water = 0.225 mol

Now we compare the moles of water with hydrogen and oxygen.

H₂O : H₂

2 : 2

0.225 : 0.225

Mass of hydrogen:

Mass of hydrogen = moles × molar mass

Mass of hydrogen = 0.225 mol × 2g/mol

Mass of hydrogen = 0.45 g

H₂O : O₂

2 : 1

0.225 : 1/2×0.225 = 0.113 mol

Mass of oxygen:

Mass of oxygen = moles × molar mass

Mass of oxygen = 0.113 mol × 32g/mol

Mass of oxygen = 3.616 g

Q 4

Given data:

Mass of phosphorus = 3.07 g

Mass of oxygen = 6.09 g

Theoretical yield of P₂O₅ = ?

Chemical equation:

4P + 5O₂ → 2P₂O₅

Number of moles of phosphorus = mass/ molar mass

Number of moles of phosphorus = 3.07 g/ 31 g/mol

Number of moles of phosphorus = 0.1 mol

Number of moles of oxygen = mass/ molar mass

Number of moles of oxygen = 6.09 g/ 32 g/mol

Number of moles of oxygen = 0.2 mol

Now we will compare the moles of P₂O₅ with oxygen and phosphorus.

O₂ : P₂O₅

5 : 2

0.2 : 2/5 ×0.2 = 0.08 mol

P : P₂O₅

4 : 2

0.1 : 2/4×0.1 = 0.05 mol

The number of moles of P₂O₅ produced from phosphorus are less that's why phosphorus will be limiting reactant.

Mass of P₂O₅ = moles × molar mass

Mass of P₂O₅ = 0.05 mol × 283.88 g/mol

Mass of P₂O₅ = 14.2 g

Theoretical yield of P₂O₅ = 14.2 g.

User Mattliu
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