HELP!! pick the correct answer please. picture attached

Answer:

88 gram is the answer in 2 significant digits

One mole of octane gives 9 moles of water. Then, 3.43 g or 0.03 moles of octane will give 0.27 moles of water that is 4.86 g of water can be produced.

Combustion is a type of chemical reaction in which a gas reacts with oxygen to give carbon dioxide and water.

The combustion reaction of octane is given as follows:

[tex]\rm C_{8}H_{18} + \frac{25}{2}O_{2} \rightarrow 8CO_{2} + 9 H_{2}O[/tex]

As per this balanced chemical equation, one mole or 114 g of octane gives 9 moles of water.

no.of moles in 3.4 g of octane = 3.4 g/114 g = 0.03 moles.

no.of moles of water produced from 0.03 moles of octane :

= (0.03 × 9) = 0.27 moles.

Molar mass of water = 18 g/mol

then, mass of 0.27 moles = 0.27 × 18 =4.86 g.

Therefore, the maximum mass of water that could be produced here is 4.86 g.

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Answer:

1. Negative

2. positive alpha

3. Gold

4. deflected

5. center

6. positive

7. positive

8. center

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

[tex]n = \frac{6.25 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{6.25}{6.02} \\ = 1.0382059[/tex]

We have the final answer as

Hope this helps you

Answer:

C. 2

Explanation:

Is a "wave function that describes properties characteristic of no more than two electrons in the vicinity of an atomic nucleus or of a system of nuclei as in a molecule."

Answer:

285 kJ

Explanation:

potential energy

= m g h

= 95,000 g × 10 m/s² × 300 meters

= 95 kg × 10 m/s² × 300 meters

= 950 kgm/s² × 300 meters

= 285,000 J

= 285 kJ

Answer:

concentration is the abundance of a constituent divided by the total volume of a mixture.

Explanation:

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Answer:

Palladium

Explanation:

The concentration of the solution is 0.132 M, the concentration of the diluted solution is  0.026 M.

Given that;

number of moles = concentration × Volume

Concentration = number of moles/volume

But number of moles = mass/molar mass

mass = 8.63 g

Molar mass =  261.35 g/mol

Hence, number of moles = 8.63 g/261.35 g/mol = 0.033 moles

volume =  250.0 mL or 0.25 L

concentration = 0.033 moles/0.25 L = 0.132 M

For the second part of the question;

Using the dilution formula, C1V1 =C2V2

C1 = initial concentration = 0.132 M

V1 = initial volume = 10.0 mL

C2 = Final concentration = ?

V2 = Final volume = 50.00 mL

C2 =  0.132 M × 10.0 mL/ 50.00 mL

C2 = 0.026 M

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Answer:

Metals consist of giant structures of atoms arranged in a regular pattern. The electrons from the outer shells of the metal atoms are delocalised , and are free to move through the whole structure. This sharing of delocalised electrons results in strong metallic bonding .

Explanation:

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Answer:

Lithium will lose 1 electron in order to become stable

Answer:

lithium has 3 electrons so it has 3 protons and 3 electrons two electrons will shell 1 and then it will shell 2

Explanation:

this is what i learned

hope it helps

Answer:

120

Explanation:

just took test

Answer:

option A

Explanation:

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Answer:

he combustion of ethane (C2H6) is represented by the equation: 2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l). In this reaction: (a) the rate of consumption of ethane ...

Explanation:

he combustion of ethane (C2H6) is represented by the equation: 2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l). In this reaction: (a) the rate of consumption of ethane ...

Answer:

Explanation:The formation of the oxide ion, O

2−

(g), from oxygen atom requires first an exothermic and then an

endothermic step as shown below:

O(g)+e

−

→O

−

(g);Δ

f

​

H

⊖

=−141kJmol

−1

O

−

(g)+e

−

→O

2−

(g);Δ

f

​

H

⊖

=+780kJmol

−1

Thus, process of formation of O

2−

 in gas phase is unfavourable even though O

2−

 is isoelectronic with neon. It is due to the fact that:

Answer:

15.75 J

Explanation:

Potential energy

= mgh

= 3,500 g × 10 m/s² × 0.45 meters

= 3.5 kg × 4.5 m²/s²

= 15.75 J

1. Earthquakes and Eruptions (volcanoes)

2. Divergent plate boundary

3. Apart from a widening valley, it equally contributes to steep mountain sides spreading. A mid-oceanic ridge is naturally produced if two oceanic plates naturally start moving away from each other.

1. When a divergent boundary occurs beneath oceanic lithosphere, the rising convection current below lifts the lithosphere, producing a mid-ocean ridge. Extensional forces stretch the lithosphere and produce a deep fissure. When the fissure opens, pressure is reduced on the super-heated mantle material below. It responds by melting, and the new magma flows into the fissure. The magma then solidifies and the process repeats itself.

2. When two plate diverge from each other also known as divergent (di-apart, vergere- to inclined) plate margin .

Two plate diverge along oceanic ridges where new lithosphere is created.

Now come to the main point: Geological Features

When two oceanic plate diverge then new sea floor is created by a process called sea floor spreading and features like Mid oceanic ridges, volcanoes & Young lava flows forms. Ex. East Pacific Rise, Mid-Adlantic Ridge.

When two continental plates diverge by continental rifting then features like Rift valley, volcanoes are found. Ex of continent continent -East Africa rift vally, Red sea.

3. The major difference between different types is what type of plate the divergent boundary is between. If the boundary is found between two continental plates you are left with a rift valley. ... If two oceanic plates begin moving away from each other it creates a mid-oceanic ridge.

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Answer:

nucleosynthesis

Explanation:

The correct answer is nucleosynthesis.

After the hydrogen in the star's core is exhausted, the star can fuse helium to form progressively heavier elements, carbon and oxygen, and so on, until iron and nickel are formed. Up to this point, the fusion process releases energy. The formation of elements heavier than iron and nickel requires an input of energy.

In a supernova explosion, neutron capture reactions take place (this is not fusion), leading to the formation of heavy elements. This is the reason why it is said that most of the stuff that we see around us comes from stars and supernovae (the heavy elements part).

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Answer:

pure substance,...................

Explanation:

B: It has fewer than 10 total watersheds best describes

A watershed is the area of land where all of the water that falls in it and drains off of it goes to a common outlet. All the land drains water into rivers that drain into the Chesapeake Bay, where it enters the Atlantic Ocean.

The area that drains into a single river is the watershed for that river.

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Answer:

AUMENTA EL SALARIO MÍNIMO Y CREA MÁS EMPLEOS

Explanation:

Answer:

D. Grass Health

Explanation:

For the reaction of deprotonation of formic acid, the concentration of HCOO⁻ at equilibrium is 0.0151 M if the initial concentration of formic acid is 1.35 M.  

The reaction of deprotonation of formic acid is the following:

CHOOH + H₂O ⇄ HCOO⁻ + H₃O⁺

At the equilibrium we have:

CHOOH + H₂O ⇄ HCOO⁻ + H₃O⁺    (1)

1.35 - x                         x           x

The acid equilibrium constant for this reaction is:

[tex] K_{a} = \frac{[HCOO^{-}][H_{3}O^{+}]}{[CHOOH]} = 1.7 \cdot 10^{-4} [/tex]  (2)

Entering the values of [CHOOH] = 1.35-x, [HCOO⁻] = [H₃O⁺] = x, into equation (2) we have:

[tex] 1.7 \cdot 10^{-4} = \frac{[HCOO^{-}][H_{3}O^{+}]}{[CHOOH]} = \frac{x^{2}}{(1.35 - x)} [/tex]  

[tex]1.7 \cdot 10^{-4}(1.35 - x) - x^{2} = 0[/tex]

After solving the above quadratic equation and taking the positive value for x (concentrations cannot be negative), we have:

[tex] x = [HCOO^{-}] = [H_{3}O^{+}] = 0.0151 M [/tex]

Therefore, the concentration of HCOO⁻ at equilibrium is 0.0151 M.

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Answer:

1000 ml

Explanation:

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Answer:

1000 ml because the bigger ml the greater density brainliest pls

Answer:

Speed can be thought of as the rate at which an object coverse distance

B) Reate distance

Answer:

New moon

Explanation:

Answer:

it is new moon

Explanation: im just smart like that

"An unbalanced force will move the box down"

I could be wrong but I tried

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