A hydrated sample of cobalt II chloride has a molar mass of 309.99 g/mol. What is the mole ratio between cobalt II chloride and water?

Answer:

I think it would be 9 moles.

Answer:

C

Explanation:

it's produced in the bone marrow

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 we have

[tex]n = \frac{7.18 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 11.92691...[/tex]

We have the final answer as

Hope this helps you

Answer:

1. D

2. A

3. B

4. A

5. BB

Explanation:

1d. 50%

2a. 29.5

3b. increasing

4a. decreasing

5b. waxing

Answer:

d.

Explanation:

The term known as "Nuclear Fusion" is a very important concept in chemistry and it is studied mostly under the topic or aspect of Chemistry known as or called radioactivity. Nuclear Fusion is the kind of reaction in which two or more atomic nucleus combines to for bigger ones.

There is a saying that there is no life without nuclear fusion because it is the reaction that causes the stars to have light.

Option 'd' is correct. This is what happens in stars in order for light to be produced that is the inward movement of gravity and the outward movement of nuclear fusion.

Answer:

nonpolar covalent

Explanation:

Comparing their electronegativities will help determine the type of bond. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The difference in electronegativity (ΔEN)  is used to determine bond type. Hydrogen has an electronegativity of 2.20 and sulfur has 2.58. The difference is 0.38,so the electrons are shared in a nonpolar covalent bond.

Answer:

trigonal pyramidal

Explanation:

In NF3, the nitrogen atom is sp3 hybridized. Now we must remember that according to the VSEPR theory, the number of electron pairs in the valence shell of the central atom in a molecule determines its shape.

Here, the nitrogen atom is the central atom and its outermost shell is surrounded by four electron pairs - one lone pair and three bond pairs. This means that it has a tetrahedral electron pair geometry.

However, due to the lone pair, the three fluorine atoms are arranged in a  trigonal pyramidal geometry. Hence the correct shape of the molecule is trigonal pyramidal.

Answer:

The solvent is water

Explanation:

The solvent is the substance in the mixture that is able to dissolve the other substances. The solvent is usually the liquid.

In the problem is said: "A saturated aqueous solution", that means the solution is made by a solute that is in excess (Sucrose) dissolved in the solvent (Water).

The solvent is water

Answer:

I think the answer is 11.190% :)

Explanation:

Hope this helps <3

Mass of Aluminium: 27 [tex]\frac{gm}{mol}[/tex]

Mass of Ferous Oxide: 71.84 [tex]\frac{gm}{mol}[/tex]

Aluminium: 7.5 Moles Given

How many moles of Iron (II) oxide(FeO)?

As there are 2 moles of aluminium involved and 3 moles of ferrous oxide So,

2 moles Al and 3 moles FeO

7.5 moles Al and x moles FeO

For X moles:

X = [tex]\frac{3\ x\ 7.5 }{2}[/tex]

X= [tex]\frac{22.5}{2}[/tex]

X= 11.25 [tex]\frac{gm}{mol}[/tex]

Explanation:

option C is the correct answer of this question

Answer:

E = 19.89×10⁻¹⁶ J

λ = 1×10⁻¹ nm

Explanation:

Given data:

Frequency of xray = 3×10¹⁸ Hz

Wavelength of xray = ?

Energy of xray = ?

Solution:

speed of wave = wavelength × frequency

speed = 3×10⁸ m/s

3×10⁸ m/s  = λ ×3×10¹⁸ s⁻¹

λ = 3×10⁸ m/s  / 3×10¹⁸ s⁻¹

λ = 1×10⁻¹⁰m

m to nm:

λ = 1×10⁻¹⁰m×10⁹

λ = 1×10⁻¹ nm

Energy of x-ray:

E = h.f

h = plancks constant = 6.63×10⁻³⁴ Js

by putting values,

E = 6.63×10⁻³⁴ Js ×3×10¹⁸ s⁻ ¹

E = 19.89×10⁻¹⁶ J

Explanation:

Electromagnetic waves are waves which can travel through the vacuum of outer space. Electromagnetic waves are created by the vibration of an electric charge. This vibration creates a wave which has both an electric and a magnetic component.

Answer: I believe that it is that the forces are balanced.

Explanation:

Explanation:

Titanium is an element found in the d-block group on the periodic table. It is a transition element.

To write the electronic configuration of an element, we must know the number of electrons in them;

 In a titanium atom, we have 22 electrons;

Shell notation  = 2  8  10 2  

Orbital notation  = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s²

Answer: [Ar]4s^2 3d^2

Explanation:

Answer:

Error or mistakes during DNA replication is accountable for two-thirds or 66% of the cancer cases. These random and unpredictable errors called mutations that occur during the division of a cell as an error in copying of DNA.

DNA replication has three main steps:

Opening and separation of DNA strands of a helix - carried by an enzyme known as helicase that breaks the hydrogen bonds between nitrogenous bases of the helix of DNA.

The priming of the template strand - DNA primase helps RNA primers to bind to both strands at 3' end as soon as it separated

strat assembling the segments of new DNA on strands called elongation of the strands with help DNA polymerase I and after forming new strands the termination of the replication.

Errors or mistakes can occasionally take place if DNA polymerase inserts a wrong base during elongation of the strands.

Answer:

The recessive allele tends to be masked when it's in the presence of the dominant allele.

Explanation:

Many of our traits are affected by our genes. From each of our parents, we receive one copy of every gene. These copies are called alleles.

There are different types of relationships that can occur between alleles. One of them is called dominance. This occurs when one allele masks the other, not allowing its effect to be expressed. The allele that masks the other is called the dominant allele (A), and the masked one is called the recessive allele (a). This means that an individual needs to have only one dominant allele in order for its effect to be expressed (AA or Aa). The effect of the recessive allele will be expressed only when an individual has both recessive alleles (aa).

Answer:

It isnt changing

Explanation:

It stays basically the same becuase it is considered a constant

Answer:

Explanation:

Speed of light = Wavelength x Frequency.

605 nm x Frequency = 3x10^8 m/s

6.05 x 10^-7 m x Frequency = 3x10^8 m/s

Frequency = 4.96 x 10^14 Hz

Answer:

ν=4.96x10^14 Hz

Explanation:

c=λν

λ=wavelength

ν=frequency

in this problem:

c=3x10^8

λ=605x10^-9

so ν=c/λ

v=(3x10^8)/(605x10^-9)

v=4.96x10^14

please give thanks :)

Answer:

The physical body of human work accosting to Action-Reaction law.

Explanation:

The rule of action-reaction state that an equivalent and reverse reaction occurs with any action.  If one entity imposes force on a second entity, the second responds by exerting an equivalent force on first entity in the same direction. 

Answer:

V₂ =  1.92 L

Explanation:

Given data:

Initial volume = 0.500 L

Initial pressure =2911 mmHg (2911/760 = 3.83 atm)

Initial temperature = 0 °C (0 +273 = 273 K)

Final temperature = 273 K

Final volume = ?

Final pressure = 1 atm

Solution:

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

by putting values,

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 3.83 atm × 0.500 L × 273 K / 273 K × 1 atm

V₂ = 522.795 atm .L. K / 273 K.atm

V₂ =  1.92 L

Answer:

A. krypton

Explanation:

give me brainly

Answer: a  capillaries

Explanation:

Answer:

Species A and C are related to humans.

Explanation:

got it right on edge.

Answer:A. Species And C are related to humans

Explanation: In the embryo humans and other Species have gill slits, and a tail. Vestigesof tales grew and non-human ancestors. On rare occasions, aremnant of the tail through and embryological development, although this tale of course has no function. An embryos splits are found in the boreals of all vertebrates because they share a common ancestors with fish and which structures first

Answer:

an increase of acceleration or decrease of acceleration

Explanation:

Answer:

What does the shape of an enzyme determine? The shape of the enzyme determines which chemical reaction it will speed up. -The region on an enzyme that the substrate fits into. ... The active site of an enzyme only fits one type of substrate molecule.

Explanation:

Answer:

A. Oxygen

Explanation:

A is the only one that makes sense because plants take in carbon dioxide, use glucose for food, and use energy to photosynthesize, and the only answer they don't use is A (oxygen) because they only produce it but not use it