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DiKsa [7]
2 years ago
13

If 50.0 g of silicon dioxide is heated with an excess of carbon, 27.9 g of silicon carbide is produced. What is the percent yiel

d of the reaction
Chemistry
1 answer:
Molodets [167]2 years ago
6 0

Answer: The percent yield of the reaction is 83.5 %

Explanation:

The given balanced equation is

SiO_2+3C\rightarrow SiC+2CO

SiO_2 is the limiting reagent as it limits the formation of product and C is the excess reagent.

According to stoichiometry :

60.08 g of SiO_2 produce = 40.11 of SiC

Thus 50.0 of SiO_2 will produce=\frac{40.11}{60.08}\times 50.0=33.4  of SiC

 Experimental yield of SiC = 27.9 g

Percent yield = \frac{\text {Experimental yield}}{\text {theoretical yield}}\times 100=\frac{27.9g}{33.4g}\times 100=83.5\%

Thus  percent yield of the reaction is 83.5 %

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1.4 x 183.84 / 1 = 257.376 g

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Which is true about the potential energy of the reactants in this reaction pathway
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it is equal to the potential energy of the products

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4. Magnesium and oxygen undergo a chemical reaction to
erastovalidia [21]

Answer:

About 16.1 grams of oxygen gas.

Explanation:

The reaction between magnesium and oxygen can be described by the equation:
\displaystyle 2\text{Mg} + \text{O$_2$} \longrightarrow 2\text{MgO}

24.4 grams of Mg reacted with O₂ to produce 40.5 grams of MgO. We want to determine the mass of O₂ in the chemical change.

Compute using stoichiometry. From the equation, we know that two moles of MgO is produced from every one mole of O₂. Therefore, we can:

  1. Convert grams of MgO to moles of MgO.
  2. Moles of MgO to moles of O₂
  3. And moles of O₂ to grams of O₂.

The molecular weights of MgO and O₂ are 40.31 g/mol and 32.00 g/mol, respectively.

Dimensional analysis:

\displaystyle 40.5\text{ g MgO} \cdot \frac{1\text{ mol MgO}}{40.31\text{ g MgO}} \cdot \frac{1\text{ mol O$_2$}}{2\text{ mol MgO}} \cdot \frac{32.00\text{ g O$_2$}}{1\text{ mol O$_2$}} = 16.1\text{ g O$_2$}

In conclusion, about 16.1 grams of oxygen gas was reacted.

You will obtain the same result if you compute with the 24.4 grams of Mg instead:

\displaystyle 24.4\text{ g Mg}\cdot \frac{1\text{ mol Mg}}{24.31\text{ g Mg}} \cdot \frac{1\text{ mol O$_2$}}{1\text{ mol Mg}} \cdot \frac{32.00\text{ g O$_2$}}{1\text{ mol O$_2$}} = 16.1\text{ g O$_2$}

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2 years ago
What causes the sea floor to move apart at a sea floor spreading center A density B continental drift C paleomagnetism D convect
pochemuha

Answer: D convection currents

Explanation:

The seafloor spreading is a phenomena that occurs due to liberation of heat from the convection currents generated in the mantle. It makes the earth crust more plastic and less dense. This happens at divergent plate boundaries. As the plates move apart, the less denser material rises. It leads to the formation of mountain and crust cracks.

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