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3 years ago

All atoms in the main group want _____ electrons in their outset shell

Chemistry

1 answer:

hammer [34]3 years ago

3 0

Most of the elements important in biology need 8 electrons in their outermost shell

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At birth, there are approximately 1 million eggs; and by the time of puberty, only about 300,000 remain. Of these, only 300 to 400 will be ovulated during a woman's reproductive lifetime. Fertility can drop as a woman ages due to decreasing number and quality of the remaining eggs.

Explanation:

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Consider the following reaction: NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2 How many mol of CO2 would be produced from the complete

Assoli18 [71]

Answer:

0.208mole of CO2

Explanation:

First, let us calculate the number of mole of HC3H3O2 present.

Molarity of HC3H3O2 = 0.833 mol/L

Volume = 25 mL = 25/100 = 0.25L

Mole =?

Mole = Molarity x Volume

Mole = 0.833 x 0.25

Mole of HC3H3O2 = 0.208mole

Now, we can easily find the number of mole of CO2 produce by doing the following:

NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2

From the equation,

1mole of HC2H3O2 produced 1 mole of CO2.

Therefore, 0.208mole of HC2H3O2 will also produce 0.208mole of CO2

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Propane reacts with 3.15moles of oxygen how much propane reacts with oxygen

Inessa [10]

27.7g

Explanation:

Given parameters:

Number of moles of oxygen = 3.15moles

Unknown:

Mass of reacting propane = ?

Solution:

Equation of the reaction:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

We work from the known to the unknown parameters.

The known in this expression is the number of moles of oxygen.

In the reaction:

5 moles of oxygen gas reacts with 1 mole of propane

3.15 mole of oxgen gas will react with $\frac{3.15}{5}$ = 0.63moles

Number of moles of reacting propane gas is 0.63moles

To find the mass;

mass = number of moles x molar mass = 0.63 x molar mass

molar mass of propane = (3 x 12) + (8x1) = 44g/mol

mass of propane = 0.63 x 44 = 27.7g

Learn more:

Combustion reaction brainly.com/question/6126420

#learnwithBrainly

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