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4 years ago

2 Zn + O2 → 2 ZnO

Chemistry

1 answer:

meriva4 years ago

3 0

Answer:

we need 6.0 moles of zinc (Zn)

Explanation:

Step 1: Data given

Number of moles ZnO produced = 6.0 moles

Step 2: The balanced equation

2 Zn + O2 → 2 ZnO

For 2 moles Zinc we need 1 mol Oxygen to produce 2 moles Zinc oxide

Step 3: Calculate moles zinc

For 2 moles Zn we need 1 mol O2 to produce 2 moles ZnO

For 6.0 moles 2nO produced, we need 6.0 moles of zinc (Zn) and 3.0 moles of O2 to react.

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Explanation:

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$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$ .....(1)

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$0.085M=\frac{\text{Moles of magnesium nitrate}}{1.5L}\\\\\text{Moles of magnesium nitrate}=(0.085mol/L\times 1.5L)=0.1275mol$

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The chemical equation for the reaction of magnesium ions and phosphate ions follows:

$3Mg^{2+}+2PO_4^{3-}\rightarrow Mg_3(PO_4)_2$

By Stoichiometry of the reaction:

3 moles of magnesium ions reacts with 2 moles of phosphate ions

So, 0.1275 moles of magnesium ions will react with = $\frac{2}{3}\times 0.1275=0.085mol$ of phosphate ions

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To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

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Putting values in above equation, we get:

$0.135mol=\frac{\text{Mass of sodium phosphate}}{164g/mol}\\\\\text{Mass of sodium phosphate}=(0.135mol\times 164g/mol)=22.14g$

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4 years ago

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