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Varvara68 [4.7K]

3 years ago

12

use the reaction that occours when magnesium burns in oxygen to show how a reaction might be included in more than one category

of reaction

1 answer:

Schach [20]3 years ago

5 0

2Mg+O₂⇒2MgO
It can be a combustion reaction, or it can be a combination reaction

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Calculate the molality of a solution prepared by dissolving 175 g of KNO3 in 750 g of water. (round to nearest hundreth)

Wittaler [7]

We will get the molality from this formula:
Molality = no.of moles of solute / Kg of solvent

So first we need the no.of moles of KNO3 = the mass of KNO3 / molar mass of KNO3
no.of moles of KNO3 = 175 / 101.01 = 1.73 mol
By substitution in the molality formula:
∴ molality = 1.73 / (750/1000) = 2.3 Molal

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3 years ago

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Aspirin (C9H8O4) may be synthesized by mixing salicylic acid (C7H6O3) with excess acetic anhydride (C4H6O3).

diamong [38]

Answer:

65.18% is the percent yield for this reaction.

Explanation:

$C_7H_6O_3 + C_4H_6O_3\rightarrow C_9H_8O_4 + C_2H_4O_2$

Moles of salicyclic acid = $\frac{2.0 g}{138 g/mol}=0.01449 mol$

According to reaction 1 mole of salicyclic acid gives 1 mole of aspirin .

Then 0.01449 mole of salicylic acid will give :

$\frac{1}{1}\times 0.01449 mol=0.01449 mol$ of asprin

Mass of 0.01449 moles of aspirin :

= 0.01449 mol × 180 g/mol = 2.6082 g

Theoretical yield of aspirin = 2.6082 g

Experimental yield of aspirin = 1.7 g

The percent yield for this reaction:

$\%(Yield)=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

$=\frac{1.7 g}{2.6082 g}\times 100=65.18\%$

65.18% is the percent yield for this reaction.

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3 years ago

Classify lead: Select one: C = compound HE = heterogeneous mixture S = homogeneous mixture/solution E = element

Ira Lisetskai [31]

Lead is an E (element) and can be found on the periodic table.

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zubka84 [21]

Answer:

6. 13.8 moles

7. 0.751 moles

8. 2.04 moles

9. 0.00794 moles

10. 0.158 moles

Explanation:

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3 years ago

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Which would usually influence a reaction rate more? OH os O H&S O Neither H nors

bagirrra123 [75]

Answer:

As the average kinetic energy increases, the particles move faster and collide more frequently per unit time and possess greater energy when they collide. Both of these factors increase the reaction rate. Hence the reaction rate of virtually all reactions increases with increasing temperature

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3 years ago