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3 years ago

0.400 mole of sucrose, C 12H 22O 11, contains ________ C atoms.

Chemistry

1 answer:

exis [7]3 years ago

8 0

Answer:

2.89x10²⁴ atoms of Carbon are contained in 0.400 moles of sucrose

Explanation:

The formula of sucrose is C₁₂H₂₂O₁₁, that means per mole of sucrose you will have 12 moles of carbon. In 0.400 moles of sucrose you will have:

0.400 moles Sucrose * (12 moles C / 1 mole Sucrose) = 4.8 moles of Carbon

To convert moles to atoms you must use Avogadro's number (1 mole contains 6.022x10²³ atoms):

4.8 moles Carbon * (6.022x10²³ atoms / 1 mole) =

<h3>2.89x10²⁴ atoms of Carbon are contained in 0.400 moles of sucrose</h3>

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Air is about 78.0% nitrogen molecules and 21.0% oxygen molecules. Several other gases make up the remaining 1% of air molecules.

kherson [118]

Answer:

The partial pressure of the other gases is 0.009 atm

Explanation:

Step 1: Data given

Air is about 78.0% nitrogen molecules and 21.0% oxygen molecules and 1% of other gases.

The atmospheric pressure = 0.90 atm

Step 2: Calculate mol fraction

If wehave 100 moles of air, 78 moles will be nitrogen,

21 moles will be oxygen, and 1 mol will be other gases.

Mol fraction = 1/100 = 0.01

Step 3: Calculate the partial pressure of the other gases

Pgas = Xgas * Ptotal

⇒ Pgas = the partial pressure = ?

⇒ Xgas = the mol fraction of the gas = 0.01

⇒Ptotal = the total pressure of the pressure = 0.90 atm

Pgas = 0.01 * 0.90 atm

Pgas = 0.009 atm

The partial pressure of the other gases is 0.009 atm

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3 years ago

_____ and _______ are necessary for rusting.

Anastaziya [24]

Answer :-

<h3>Water and Air are necessary for rusting .</h3>

3 0

3 years ago

Read 2 more answers

using the equation you wrote determine how many moles of butane c4h10 are needed to react with 5.5 moles of oxygen

GaryK [48]

Answer:

0.846 moles.

Explanation:

This is a stichiometric problem.

The balanced equation of complete combustion of butane is:

C₄H₁₀ + 6.5 O₂ → 4 CO₂ + 5 H₂O

It is clear from the stichiometry of the balanced equation that complete combustion of 1.0 mole of butane needs 6.5 moles of O₂ to produce 4 moles of CO₂ and 5 moles of H₂O.

<u><em>Using cross multiplication:</em></u>

1.0 mole of C₄H₁₀ reacts with → 6.5 moles of O₂

??? moles of C₄H₁₀ are needed to react with → 5.5 moles of O₂

The number of moles of C₄H₁₀ that are needed to react with 5.5 moles of O₂ = (1.0 x 5.5 moles of O₂) / (6.5 moles of O₂) = 0.846 moles.

3 0

3 years ago

The [OH-] of a solution is 7.89 10^-12 M. What is the pH of the solution? it acidic or basic? *

kompoz [17]

Answer: pH = 2,897 , basic $[H+][OH-] = 10^{-14} ==> [H+] = \frac{10^{-14}}{7,89*10^{-12} } =\frac{1}{789} \\pH= -lg([H+]) = 2,897 \\pH basic$

Explanation:

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3 years ago

Your bedroom gets direct sunlight through a window during the hottest times of the day. you ask your mom to turn down the thermo

Kipish [7]

If you take your mom's advice, a. the room will be cooled by minimizing heat transfer by reflection.

The Sun is heating your room by its <em>radiation</em>.

The aluminium foil is shiny, so it reflects the Sun’s radiation back outside the window.

<em>Convection</em> is the transfer of heat caused by the air moving around in your room.

<em>Conduction</em> occurs only when a hot object is in contact with a cooler object.

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3 years ago