How many moles are in 2.5 g of N2
O 0089 moles
0.18 moles
13 moles
11 moles

Explanation:

Question 1

D

Question 2

D

Answer:

Liters

Cubic centimeter

Cubic decimeter

Explanation:

The amount of space a matter occupies is the volume of the body. Gases takes up by far the largest amount of space because they fill into any available space.

There are several units of measuring volume but the more common one are:

      Liters, Cubic decimeter and cubic centimeter.

The volume of a body can be derived in many ways. Some by measuring and others by indirect quantification.

Answer:literly same im doing the test. Now and its so hard

Explanation:

Anyone help plz

There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, melting of ice is example of convection type of heat flow.

Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.

To move any object energy is required so work has to be done by the gas to the piston. Heat can be transferred by three ways conduction, convection and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. Melting of ice is example of convection type of heat flow.

Therefore, melting of ice is example of convention type of heat flow.

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Answer:

a I believe

Explanation:

Have a good day

That would be SiBr4, hope this helps ^^

Silicon pentabromide has the formula SiBr₅ . It is a covalent compound formed by electron sharing between Si and Br atoms.

Silicon pentabromide is a covalent compound formed by sharing of electrons between Si and Br atoms. Silicon is 14th group element and it has 4 valence electrons. It needs 4 more electrons to achieve octet.

Br is 17th group element having 7 valence electrons. It needs 1 more electron to achieve octet. Thus, it combines with other atoms by gaining or sharing electrons.

The compound SiBr₅ is in fact does not exist. Because Si does not have 5 electrons in its valence shell to share with each Br. But Br can share its one electron with Si, and Si will gain  9 electrons in its valence shell and thus deviates from rule of octet.

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Answer:

c.10 m/s²

Explanation:

By the newton's second law

Explanation: You know that the mass of an individual lead atom is equal to

3.4

⋅

10

−

22

grams.

A substance's density tells you what its mass per unit of volume is. In this case, you know that lead has a density of

11.3 g/cm

3

, which means that each

cm

3

of lead will have a mass of

11.3 g

.

Now, your cube has a volume of

2.00 cm

3

, which means that its mass will be equal to

2.00

cm

3

⋅

density



11.3 g

1

cm

3

=

22.6 g

Now all you have to do is look at the mass of one lead atom and figure out exactly how many lead atoms would be needed to make the total mass of the cube equal to

22.6 g

.

22.6

g

⋅

the mass per atom



1 lead atom

3.4

⋅

10

−

22

g

=

6.647

⋅

10

22

lead atoms

Rounded to two sig figs, the number of sig figs you have for the mass of an individual lead atom, the answer will be

no. of lead atoms

=

6.6

⋅

10

22

atoms

You can double-check this result by using lead's molar mass, which tells you what the exact mass of one mole of lead is.

22.6

g

⋅

1 mole Pb

207.2

g

=

0.1091 moles Pb

Now use Avogadro's number to determine how many atoms of lead you have in that many moles

0.1091

moles

⋅

6.022

⋅

10

23

atoms

1

mole

=

6.57

⋅

10

22

atoms

To two sig figs, you will once again get

no. of lead atoms

=

Answer:

the empirical formula is [tex]H_2NO_2[/tex]

Explanation:

The empirical formula is

The following information is given

It contains 29.17 mass percentage of N

4.20 mass percentage of H

And, 66.63 mass percentage of 0

Now based on the above information, the empirical formula is [tex]H_2NO_2[/tex]

hence, the same is to be considered and relevant too

Considering the definition of empirical formula,  the empirical formula is H₂N₁O₂= H₂NO₂

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers small as possible.

Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O.

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 29.17 grams of N, 4.20 grams of H and 66.63 grams of O.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Therefore the H: N: O mole ratio is 2: 1: 2

Finally, the empirical formula is H₂N₁O₂= H₂NO₂

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Answer:The answer would be D.

Explanation:

Conductivity can be tested.

Answer: Natural gas is produced from onshore and offshore natural gas and oil wells and from coal beds.

Explanation:

Answer: Low melting points

Explanation:

Answer:

wave c i think

Explanation:

Answer:

It is one of the six Little Wizard Stories of Oz. The Cowardly Lion and the Hungry Tiger have grown bored with their guard duty at Ozma's throne in the Royal Palace of the Emerald City. The Lion wants to attack a man and make "chop suey of him." The Tiger longs, at last, to satisfy his hunger for a fat baby.

Explanation:

i hope this help u

Answer: The ground pushes up

Explanation:

Answer:

459.6711 grams

Explanation:

Answer:

V₂ = 1.17 L

Explanation:

Given data:

Initial volume of balloon = 1.25 L

Initial temperature = 35°C

Final temperature = 15°C

Final volume = ?

Solution:

Initial temperature = 35°C (35+273.15K = 308.15 K)

Final temperature = 15°C (15+273.15 K = 288.15 K)

The given problem will be solve through the Charles Law.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 1.25 L × 288.15 K / 308.15 k

V₂ = 360.2  L.K / 308.15 k

V₂ = 1.17 L

Answer:ASEXUAL: Single parent, Genetically identical, Replication,Budding, splitting /  splicing and plant cutting propogation  SEXUAL: Two parents, genetically unique, Humans and Cows

Explanationasexual is one parent or stays the same, sexual is where two combine

Answer:

Explanation:

The solution is a dilute solution of methanol. It is described as a "40% methanol" concentration which means the solution is 40% of methanol in the solution. In this solution, it is 40% of methanol and 60% of water. If any solution is to be prepared from this model, the solution must have 40% of methanol, hence to prepare a 200 mL of the same model (40%) of methanol solution, the volume of methanol would be 80 mL and the volume of water would be 120 mL.

The volume of CO2 at STP =124.298 L

Given

Reaction

4 KMnO4, +4 C3H5(OH)5, -7K2CO3, + 7 Mn2O3, +5 CO2, + 16 H2O

701,52 g of KMnO4

Required

volume of CO2 at STP

Solution

mol KMnO4 (MW=158,034 g/mol) :

mol = mass : MW

mol = 701.52 : 158.034

mol = 4.439

mol CO2 from equation : 5/4 x mol KMnO4 = 5/4 x 4.439 = 5.549

At STP 1 mol = 22.4 L, so for 5.549 moles :

=5.549 x 22.4

=124.298 L

Answer:

write down each element and what you need to know about it repeatedly, and it will burn into your brain

Explanation:

Answer: b

Explanation:

Answer:4

Explanation: I know because I got it right

Statement that gives description as regards energy and bonding changes between atoms such as fluorine become a molecule of fluorine is : 4:Energy is released as a bond is formed.

Therefore, option 4, is correct.

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Answer:

The crust is always made of different materials under the mountains than under the oceans.

Explanation:

Right answer

Mark me as brilliant and thank you.

Among the given statements option 4 is correct. The crust is thinner under the oceans than under the mountains. The composition of earth crust should vary from that under oceans.

The earth crust is made of rocks and soil made of different elemental compositions. The crest properties in region may varies in each region. The continental thickness of crest is always thicker than the oceanic crest.

The layer of granitic, sedimentary, and metamorphic rocks that makes up the continental crust is what gives rise to the continents and the continental shelves, or shallow seafloor regions adjacent to their shores. Since it is less dense than the mantle material, it "floats" on top of it.

Even though it is significantly thicker—typically 35 to 40 km vs the average oceanic thickness of roughly 7 to 10 km—continental crust is less dense than oceanic crust. Currently, continental crust covers about 40% of the Earth's surface.

The thinnest continental crust is found in rift zones, where it is finally split and replaced by oceanic crust after thinned by detachment faulting.  (both sides of the Atlantic Ocean, for example). Hence, option 4 is correct.

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Answer:

18

Explanation:

The n - level given is 3

To find the number electrons that can occupy this level, we use:

                2n²  

n - is the energy level.

The energy level here is 3;

            2 x 3²   = 18

Answer:

Physical properties such as size, shape, color, density, magnetism or the ability to sink or float can be used to separate the substances in a mixture.. Filtration is when matter is passed through a filter and the larger particles are separated out.

Explanation:

Answer:

Every magnet has two sides: a north pole and a south pole. We use these names because if you hang a magnet from a thread, the magnet’s north pole points (almost) towards the north direction.

This is because the Earth’s core (its centre) is a large, weak magnet. Your little, strong magnet lines up with Earth’s magnetic core, so it points north. That’s how a magnetic compass works.

Answer:

0.42mole

Explanation:

Given parameters:

Number of atoms of titanium  = 2.5 x 10²³atoms

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.

              6.02 x 10²³ atoms makes up 1 mole of an atom

              2.5 x 10²³ atoms will contain [tex]\frac{2.5 x 10^{23} }{6.02 x 10^{23} }[/tex]   = 0.42mole

Answer:

l think,probably 6.022 X 1023

Answer:

0.93559956338688

Explanation: