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3 years ago

What is the oxidation half-reaction for 2Mg + O2 + 2Mgo?

Chemistry

1 answer:

miv72 [106K]3 years ago

5 0

Answer:

B => Mg° => Mg⁺² + 2e⁻

Explanation:

2Mg° + O₂ => 2MgO rewrite => Mg° + 1/2O₂ => 2MgO

Oxidation Half Rxn => Mg° => Mg⁺² + 2e⁻

Reduction Half Rxn => 1/2O₂ + 2e⁻ => 2O⁻

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FYI Note => For half-reactions one always finds the electrons listed on the product side of the reaction for oxidation reactions and for reduction reactions on the reactant side.

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Given the following chemical equation, if 50.1 grams of silicon dioxide is heated with excess carbon and 32.3 grams of silicon c

aivan3 [116]

Answer:

97%.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

SiO2 (s) + 3C (s) —> SiC(s) + 2CO(g)

Next, we shall determine the mass of SO2 that reacted and the mass of SiC produced from the balanced equation. This is illustrated below:

Molar mass of SiO2 = 28 + (16x2) = 60 g/mol

Mass of SO2 from the balanced equation = 1 x 60 = 60 g

Molar mass of SiC = 28 + 12 = 40 g/mol

Mass of SiC from the balanced equation = 1 x 40 = 40 g.

From the balanced equation above,

60 g of SiO2 reacted to produce 40 g of SiC.

Next, we shall determine the theoretical yield of SiC. This can be obtained as follow:

From the balanced equation above,

60 g of SiO2 reacted to produce 40 g of SiC.

Therefore, 50.1 g of SiO2 will react to produce = (50.1 x 40)/60 = 33.4 g of SiC.

Therefore, the theoretical yield of SiC is 33.4 g

Finally, we shall determine the percentage yield of SiC as follow:

Actual yield of SiC = 32.3 g

Theoretical yield of SiC = 33.4 g

Percentage yield =?

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 32.3/33.4 x 100

Percentage yield = 96.7 ≈ 97%

Therefore, the percentage yield of the reaction is 97%.

3 0

3 years ago

How many total atoms are in 0.680 g of P₂O5?

Ludmilka [50]

Answer: 2.88× $10^{24}$ atoms $P_{2}O_{5}$

Explanation: First, using stoichiometry, we must convert this from grams to moles, then from moles to atoms.

1. For the first step, we should also look at the periodic table to find the molar mass of the compound, then use that as the denominator.

$0.680g P_{2} O_{5} *\frac{1molP_{2} O_{5} }{141.948gP_{2} O_{5} } =4.79mol P_{2} O_{5}$

2. Now that it is converted to moles, we must convert it to atoms by multiplying it by Avogadro's number.

$4.79molP_{2} O_{5} *\frac{6.022X10^{23} }{1mol} =2.88*10^{24}$

With this information, we know that there are $2.88X10^{24}$ total atoms in 0.680 grams $P_{2} O_{5}$ .

I hope this helps! Pls give brainliest!! :)

8 0

2 years ago

Read the excerpt from Kennedy’s inaugural address. To those people in the huts and villages of half the globe struggling to brea

Anna007 [38]

Answer:

an emotional appeal to emphasize the United States' commitment to justice

Explanation:

3 0

2 years ago

Read 2 more answers

A block of metal has a mass of 51.11 g and displaces 71.46 ml of water. Calculate the density of the metal in g/ml.

Damm [24]

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass of metal = 5.11 g

volume = 71.46 mL

The density of the metal is

$density = \frac{5.11}{71.46} \\ = 0.071508536...$

We have the final answer as

Hope this helps you

8 0

3 years ago

Write the ratio as a fraction in lowest terms.<br>compare in inches.<br>3 feet to 45 inches

OLEGan [10]

4/5. 3 feet to inches is 36 inches. 36 inches/45 inches can be reduced to 4/5.

3 0

3 years ago