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The concentration of this acid in moles per litre : 17.41

Given

99.5% acetic acid

density=ρ=1.05 g/ml

Required

the concentration (mol/L)

Solution

99.5% dan density 1.05 g/ml (MW acetic acid = 60 g/mol)

[tex]\tt 99.5\%\times 1.05\dfrac{g}{ml}\times \dfrac{1000~ml}{L}=1044.75~g/L\\\\\dfrac{1044.75~g/L}{60~g/mol}=17.41~mol/L[/tex]

Answer:

answer is A

Explanation:

just took test

have a good day :)

In a piece of copper, the valence electrons move freely between the cations. Therefore, option (A) is correct.

Valence electrons can be defined as the electrons present in the outermost shell of an atom whereas the electrons occupying the inner shell are known as core electrons. Lewis structures can be helpful to evaluate the number of valence electrons and know the types of chemical bonds.

Valence electrons are occupied in different electron shells. These electrons participate in the interaction between atoms and cause the formation of chemical bonds.

Only electrons filled in the valence shell can contribute to the formation of a chemical bond between atoms and decide the reactivity of the element.

The electrons in the piece of copper move freely because the electrons are loosely bound electrons are responsible for the conductivity of the metal. The free movement of electrons in the electron sea is stabilized by the positively charged kernels.

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Answer:

The Earth's orbit is an ellipse.

Explanation:

The Earth's orbit is not a perfect circle. It is elliptical, or slightly oval-shaped.

Earth's Rotation causes day and night.

The Moon goes around Earth. The Earth goes around the sun.

Answer:

quantitative

Explanation:

Answer: The pH scale is a color coded scale that identifies acids and bases and neutral substances. Acids are 1-7 and bases are 8-14. Neutral substance are neutral like water.

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

The pH   scale is a color coded scale that identifies acids and bases and neutral substances. The colours from yellow to red indicate an acidic solution, colours blue to violet indicate base and green colour indicates that a solution is neutral.

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7. Thus pH scale range from 1 to 14.

Water is neutral with a pH of 7.

Answer:

The triple bonds are the strongest and hence the shortest. Then comes double bonds which are of intermediate strength between the triple and single bonds. And finally the single bonds are weaker than the other two.

This way, Triple bonds are the shortest. Then comes double bonds. Finally, single bonds are the longest among the three.

The order of bond lengths is given as,

Triple bond < Double bond < Single bond

Answer:

there are 4 sulfur atom.

im pretty sure its A if i did all my reasearch right.

hope this helps luv. <3

Answer:

is A

Explanation:

Universe - Galaxy - Solar system - Earth

Brainliest plz

Hope it work

Answer:

Explanation:

-

Hello there, I hope you are having a great day Your Question: Which is not an advantage of sexual reproduction? Would be A Diverse Offspring because some could be got to the mother or father carry are mixed together in the offspring.

Answer:

6.25

Explanation:

Answer:

-460 Im pretty sure

Explanation:

Answer:

sorry bro / sis this is too long question soo try by yourself

Answer:

Low density

Explanation:

The answer to this question is low density as Gases in general have low densities as their particles are very far apart. Their inter-molecular spaces are actually large. And The number of molecules per unit volume in a gas are small when we put them in comparisons with solids and liquids. That is why they have low densities.

I hope this answers your question.

Answer:

Lightning

Explanation:

Lightning is a spark caused when electricity that has built up in a thunderhead discharges.

Answer:

Angel Fish!

Explanation:

Answer:

Angel fish, the other person answered first tho.

Explanation:

Answer: looks like A

Explanation:

Answer:  B. 29.76°C

Explanation:

The melting point is known as an intensive property of matter. This means the melting point is not affected by the amount of mass. Whether the metal is really large or small, the melting point of gallium (Ga) is roughly 29.76 degrees Celsius.

Answer:

Step-by-step explanation: We are asked to find the distance covered by a man in 15 minutes at a speed of 16 km/hr. 15 minutes = 15/60 hour. Therefore, the person can run 4 km in 15 minutes.

Explanation:

Answer:

Static electricity is the result of an imbalance between negative and positive charges in an object. These charges can build up on the surface of an object until they find a way to be released or discharged.

Explanation:

Answer:

Elements are the simplest complete chemical substances.

Each element corresponds to a single entry on the periodic table.

An element is a material that consists of a single type of atom.

A compound consists of two or more types of elements held together by covalent or ionic bonds

Answer:

[tex]\boxed {\boxed {\sf 2.29 *10^{24} \ atoms \ Ca}}[/tex]

Explanation:

To convert from moles to atoms, we must use Avogadro's Number.

[tex]6.022*10^{23}[/tex]

This number tells us the number of particles (atoms, molecules, ions, etc.) in 1 mole. In this case, the particles are atoms of calcium (Ca).

[tex]6.022*10^{23} \ atoms \ Ca / 1 \ mol \ Ca[/tex]

1. Convert from moles to atoms.

Write Avogadro's number as a fraction.

[tex]\frac {6.022 *10^{23} \ atoms \ Ca} {1 \ mol \ Ca}[/tex]

Multiply the given number of moles of calcium (3.8) by the fraction created.

[tex]3.8 \ mol \ Ca *\frac {6.022 *10^{23} \ atoms \ Ca} {1 \ mol \ Ca}[/tex]

The moles of calcium will cancel.

[tex]3.8 *\frac {6.022 *10^{23} \ atoms \ Ca} {1 }[/tex]

The denominator of 1 is insignifcant and we can turn this into a simple multiplication problem.

[tex]3.8 * {6.022 *10^{23} \ atoms \ Ca}[/tex]

[tex]2.28836*10^{24} \ atoms \ Ca[/tex]

2. Round

The problem tells us to round to 2 decimal places or the hundredth place.

[tex]2.28836*10^{24} \ atoms \ Ca[/tex]

The 8 in the thousandth place tells us to round the 8 to a 9.

[tex]2.29 *10^{24} \ atoms \ Ca[/tex]

There are about 2.29*10²⁴ atoms of calcium in 3.8 moles.

Answer:

Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.

Answer:

Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.

Answer:

920mL of water

Explanation:

To solve this question we need to find as first the mass that must be added of water to make 1000mL of syrup using specific gravity. Thus, we can know the volume of water that mus be added:

1.31 is 1.31g/mL. In 1000mL = 1310g/1000mL. As the mass added of sucrose is 850g, the mass of water = Volume of water is:

1310g - 850g = 460g of water = 460mL to make 1L, To make 2L the amount of water that must be added is:

460mL * 2  =

The number of milliliters of water are used to prepare two liters of syrup is 920 mL of water.

Given that,

Based on the above information, the calculation is as follows:

1.31 is = 1.31g/mL.

Now

In 1000mL = [tex]1310g \div 1000mL[/tex].

Now if the mass is added so the mass of water should be equivalent to the volume of the water.

= 1310g - 850g

= 460g of water

Now

= 460mL for 1L,

To make 2L the water should be  

= 460mL (2)

= 920mL of water

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Answer:

In general, the atomic radius decreases as we move from left to right in a period and it increases when we go down a group. This is because in periods the valence electrons are in the same outermost shell. The atomic number increases within the same period while moving from left to right which in turn increases the effective nuclear charge.

Explanation:

the new model fits the data better than the old model

The true statement about the new model is the new model fits the data better than the old model. The correct option is b.

In Rutherford's gold foil experiment, he discovered that most particles passed through the gold foil, some were distributed in other directions, and very few were redirected back toward the source.

Because all the particles would pass through without being deflected if there was a symmetrical distribution of charges, this experiment proves that the plum pudding model was erroneous.

Rutherford’s gold foil experiment demonstrated how tightly packed the positive charge is within the atom. This was a better experiment.

Thus, the correct option is b. The new model fits the data better than the old model.

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Answer:

Physical Weathering

Frost wedging. Frost wedging happens when water filling a crack freezes and expands (as it freezes, water expands 8 to 11% in volume over liquid water). ...

Heat/Cold Cycles. ...

Unloading

Explanation:

Answer:

Molarity = 0.95 mol/dm³

Explanation:

Given data:

Volume of H₂SO₄ = 15.8 cm³

Volume of NaOH = 20 cm³

Concentration of NaOH = 1.5 mol/dm³

Concentration of H₂SO₄ = ?

Solution:

Chemical equation:

NaOH + H₂SO₄      →          Na₂SO₄ + H₂O

First of all we will calculate the number of moles of NaOH and for that we will convert the units first,

Volume = 20 cm³/1000 = 0.02 L

Concentration of NaOH = 1.5 mol/dm³

1 mol/dm³ = 1 mol/L

Concentration of NaOH = 1.5 mol/L

Number of moles of NaOH:

Molarity = number of moles / volume in L

1.5 M = number of moles / 0.02 L

Number of moles = 1.5 M ×0.02 L

Number of moles = 0.03 mol

Now we will compare the moles of NaOH and H₂SO₄

                     NaOH           :        H₂SO₄

                         2               :           1

                     0.03             :        1/2×0.03 = 0.015 mol

Concentration of H₂SO₄:

Volume of H₂SO₄:

15.8 cm³/1000 = 0.0158 L

Molarity = number of moles / volume in L

Molarity = 0.015 mol / 0.0158 L

Molarity = 0.95 mol/L

1 mol/L = 1 mol/dm³

Molarity = 0.95 mol/dm³

Answer:

four elements

Explanation:

He = 1s²

Be = 1s² 2s²

C = 1s² 2s² 2p²

Mg = 1s² 2s² 2p⁶ 3s²

Si = 1s² 2s² 2p⁶ 3s² 3p²

Ca = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Valence electrons are those electrons which are present in outer most electronic shell.

He, Be, Mg, Ca these four elements have 2 valence electrons.

While Si and C have four valance electrons.

The total number of the elements above with 2 valence electron is four.

The electronic configurations of the elements are given:

He = 1s²

Be = 1s² 2s²

C = 1s² 2s² 2p²

Mg = 1s² 2s² 2p⁶ 3s²

Si = 1s² 2s² 2p⁶ 3s² 3p²

Ca = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Valence electrons are those electrons which are present in outer most electronic shell.

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