How many grams are in 4.7 moles of Na2O?

Answer:

The correct answer choices are B and D.

Explanation:

A volcanic eruption happens when magma reaches the surface of the earth.  Depending on the amount of gas and the silica content of the magma, the lava and the type of eruption can vary.  Silica, which forms from the elements silicon and oxygen, makes the lava thicker and less runny. When lava is thick, the volcanic eruption tends to be more explosive.  The amount of silica also changes the color and density of the lava, which then makes different kinds of igneous rocks.  As the gas content of the lava goes up, the eruption becomes more explosive.  

Answer:

Environmental Changes

Explanation:

Answer:

d

Explanation:

Answer:

See explanation

Explanation:

Chlorine has three shells. We know that the first shell contains two electrons, the other shell has eight electrons while the last shell has seven electrons. This means that chlorine has seventeen electrons.

For sodium, there are also three shells. The first shell has two electrons as usual. The next shell has eight electrons while the last shell has only one electron. This makes a total of eleven electrons for sodium.

Answer: sodium-11

chlorine-17

Explanation: meow

Answer: Entropy.

Explanation:

If we recall the laws of thermodynamics, there is a state function called entropy, that is related to the disorder in the system.

Such that, for example, in a gas expansion, we will have an increase in the "disorder" then we will have an increase in the entropy, this happens because we have more volume where the particles can be, then we have a larger number of "microstates" (or microscopic states, which refers to the states of the particles that conform the gas)

Particularly, when we go into statistical thermodynamics, there is something called the "Statistical entropy" that is related to the information theory, where the entropy depends on the number of possible outcomes that some event, like a chemical reaction, can have.

For a larger number of possible outcomes, we will have a larger entropy (we can think of this larger number of possible options as a disorder) and this entropy will be related to the statistical probability of each one of those outcomes.

Where the (most general) equation for the entropy is:

S = Kb*Σpₙ*ln(pₙ)

Where pₙ is the probability for the n-th outcome.

Kb is Boltzman's constant.

Answer:

this question is badly formatted. CO2

Explanation:

the answer is CO2 because C and O are both anions/nonmetals. the other examples contain a cation/metal, so they're ionic compounds

Answer:

i think it is 1.27 x1024

Explanation:

i don't really know though

Answer:

(160/28+48)=(160/76)*6.022x10²³

Answer:148.31 Grams per mol

Explanation: It has been a long time since I took chemistry.

I believe you add up all the elements molar mass.

magnesium nitrate is Mg(NO3)2 so you add

MG  24.30

N 14.01 * 2 = 28.01

O 16.00 * 6 = 96.00

total is 148.31 grams per mol

I hope this helps.  

The molar mass of magnesium nitrate is 148.31 grams per mol.

The term molar mass is defined as the ratio between the mass and the amount of substance of any sample of the known compound. A mole of any substance is 6.022 × 10²³ molecules.

1 mole = 6.022 × 10²³ elementary entities.

The molar mass of a substance is calculated by adding the quality atomic masses in g/mol of the constituent atoms. Molar mass is represented by the symbol "M".

For calculating molar mass of magnesium nitrate is Mg(NO3)2

Mg =  24.30

Nitrogen = 14.01 × 2

= 28.01

Oxygen = 16.00 × 6

= 96.00

Therefore, molar mass of magnesium nitrate is Mg(NO3)2

=  24.30 + 28.01 + 96.00

=  148.31 grams per mol.

Thus, The molar mass of magnesium nitrate is 148.31 grams per mol.

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Answer:

the first one

Explanation:

1x+cb=23

thios  is right because math

Answer:

A, D, E

Explanation:

a. "A dog panting to stay cool on a hot day" is a mechanism the dog employs to maintain it's body temperature. This is homeostasis.

d. "A bear hibernates in order to reduce their metabolism and conserve energy during the winter" is also all about keeping the internal condition of the bear's body constant. So this is also an example of homeostasis.

e. The lizard trying to keep regulate it's body temperature is also part of homeostasis.

Answer:

[tex]m_{N_2}=56.04 gN_2[/tex]

Explanation:

Hello!

In this case, since nitrogen diatomic gas is a molecule that has the following molar mass:

[tex]M_{N_2}=14.01*2\\\\M_{N_2}=28.02g/mol[/tex]

Thus, since we have two moles of this molecule, we can compute the referred mass as shown below:

[tex]m_{N_2}=2molN_2*\frac{28.02gN_2}{1molN_2}\\\\m_{N_2}=56.04 gN_2[/tex]

Best regards!

Answer:

A. 20.5 atm

Explanation:

Using the formula Pv=.nRt

Answer:

PV=nRT

P(56.4)=45.3×0.08206×310.5

P=1154.227/56.4

=20.4650

Approximately 20.5 then A is the answer

Answer:

See explanation and images attached

Explanation:

The complete question his shown in the image attached to this answer.

This reaction is a substitution reaction. We identify it as a substitution reaction because one specie replaced another in the substrate.

The organic product and inorganic products were also shown in the image. The bond was breakage is a hetereolytic fission since the two electrons of the bond reside on only one of the species.

Answer: 55.56 moles of MgO

Explanation:

1 mole = avogadro number

if 6.21x10^25 atoms then molecules of MgO (equal numbers of Mg and O atoms)

= 0.5*6.21x10^25 = 3.105 molecules of MgO

So moles of MgO = 0.5*6.21*10^25/avogadro number = 55.56

Answer:

P.E for the 4kg bowling ball held 2.5 meters above head is 100j, while the other is 60j so the 4kg ball has more potential energy

Answer: A physical property that will be the same regardless of the amount of matter. Extensive Properties:  A physical property that will change if the amount of matter changes.

Answer:

0.5195 liters of water

Explanation:

First we convert 15.4 grams of barium sulfide (BaS) into moles, using its molar mass:

Then we calculate the required volume of water, using the definition of molarity:

Answer: Its all of them

Explanation: I just took the test

Answer:

21 molecules of water.

Explanation:

The polymerization of a 22-monomer long cellulose molecule will require 21 molecules of water. This is because the polymer bond is formed when the -OH group from the 1st monomer of the glucose unit and the H group from the 2nd monomer gets removed as a water molecule. This process is termed to be a condensation reaction.

Answer:

11 molecules of CH4.

23 atoms of C is the leftover.

Explanation:

Hello!

In this case, for the formation of methane:

[tex]C+2H_2\rightarrow CH_4[/tex]

We can see there is an excess of carbon based on their stoichiometry, because the needed amount of hydrogen gas molecules would be:

[tex]molecules _{H_2}=34atomC*\frac{2molec\ H_2}{1atomC} =68molec\ H_2[/tex]

Thus, the formed molecules of methane are computed below:

[tex]molec\ CH_4=22molec\ H_2 *\frac{1molec\ CH_4}{2molmolec\ H_2} \\\\molec\ CH_4=11molec\ CH_4[/tex]

In such a way, the leftover of carbon atoms are:

[tex]atoms \ C^{left over}=34-22molec\ H_2*\frac{1atoms C}{2molec\ H_2} \\\\atoms \ C^{left over}=23 atoms C[/tex]

Best regards!

C₆H₁₂O₆ has the greatest molar mass (180 g/mol)

Given

Compounds of A. H2O B. C6H12O6 C. HNO3 D. C2H6

Required

The greatest molar mass

Solution

The molar mass(molecular mass-formula mass) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound

A. H₂O : 2.1+16 = 18 g/mol

B. C₆H₁₂O₆ : 6.12+12.1+6.16=180 g/mol

C. HNO₃ : 1.1+1.14+3.16=63 g/mol

D. C₂H₆ : 2.12+6.1 = 30 g/mol

Answer:

a

Explanation:

its too much of a solid to be broken down

The substance can not be broken down by a chemical change is A)magnesium.

substance can be regarded as a  particular kind of matter which posses a uniform properties.

Therefore, during a chemical change all the given substance can be broken down because they are compounds, but magnesium is an element which cannot be broken down.

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Answer:

57.6 KJ/mol

Explanation:

We have that;

T1 = 301 K

T2= 311 K

k1 = k1

k2= 2k1

R = 8.314 JK-1

Ea= ?

So;

ln(k1/k2) = (-Ea/R) (1/T1 - 1/T2)

ln (k1/2k1) = -(Ea/8.314) (1/301 - 1/311)

ln(1/2) = -(Ea/8.314) (3.3 * 10^-3 - 3.2 * 10^-3)

-0.693 = -(Ea/8.314) 0.1 * 10^-3

-0.693/ 0.1  * 10^-3 = -(Ea/8.314)

-6930 =  -(Ea/8.314)

Ea = 6930 * 8.314

Ea = 57.6 KJ/mol

Answer:

See explanation

Explanation:

Let the rate of diffusion of the unknown gas be x

Let the rate of diffusion of nitrogen be y

Let molecular mass of unknown gas be MX

Let molecular mass of nitrogen be My

Hence;

x/y = √My/MX

0.936/1 = √28/MX

(0.936/1)^2= 28/MX

MX= 28/0.876096

MX= 32 g/mol

MX is O2 gas

Answer:

12.01% by mass

Explanation:

Percent by mass is 100 times the mass of solute (ammonia) over the mass of the solution. In molarity, we have the moles of ammonia per liter of solution. There are 6.70moles of NH3 in 1L. Thus, we need to convert the moles of ammonia to grams and the liters of solution to grams:

Mass ammonia - Molar mass: 17.031g/mol-

6.70moles * (17.031g / mol) = 114.1g NH₃

Mass solution:

1L * (1000mL / 1L) = 1000mL * (0.950g/mL) = 950g

Percent by mass:

114.1g NH₃ / 950g * 100 =

Answer:

[tex]^{31}_{15}P[/tex] is the isotopic notation of the atom

Explanation:

The isotope notation is:

[tex]^a_bX[/tex]

Where a is the mass number = Number of protons + Number of neutrons

b is atomic number = Number of protons

The atomic number define the nature of the atom, the element with atomic number = 15 is phosphorus, P:

[tex]^a_bP[/tex]

a = 15 protons + 16 neutrons = 31

b = 15

[tex]^{31}_{15}P[/tex] is the isotopic notation of the atom.