structure of 2,3-dimethylheptane

Answer:

Al2O3

Explanation:

Empirical formula is found by converting percent composition into a mole ratio.

First, assume you have a 100g sample of the substance. This allows you to make your percent composition into grams.

100% = 100g

53% = 53g Al

47% = 47g O

Next, divide each substance's mass by their molar mass. This converts your number to moles.

[tex]53g Al / 27g Al = 1.96 mol\\\\47g O/16g O = 2.93mol[/tex]

Next, divide both mol answers by the smallest number of moles.

[tex]1.96mol/1.96mol = 1\\2.93mol/1.96mol = 1.5[/tex]

Usually, these answers would be your subscripts for your empirical formula. However, we cannot have a decimal subscript, so we will multiply our answers by a factor of 2 to get to a whole number. This gives us 2 moles of Al and 3 moles of oxygen, or a formula of Al2O3.

Considering the definition of empirical formula, the correct answer is the second option: the empirical formula is Al₂O₃.

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.

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 53 grams of Al and 47 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:

Al: [tex]\frac{53 grams}{27 \frac{grams}{mole} }[/tex]= 1.9629 moles

O: [tex]\frac{47 grams}{16 \frac{grams}{mole} }[/tex]= 2.9375 moles

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:

Al: [tex]\frac{1.9629 moles}{1.9629 moles}[/tex]= 1

O: [tex]\frac{2.9375 moles}{1.9629 moles}[/tex]≅ 1.5

You cannot have a decimal subscript, so you will multiply our answers by a factor of 2 to get to a whole number:

Al: 1× 2= 2

O: 1.5× 2= 3

Therefore the Al:O mole ratio is 2: 3

Finally, the correct answer is the second option: the empirical formula is Al₂O₃.

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Explanation:

Sublimation describes a solid turning directly into a gas. Melting, on the other hand, occurs when a solid turns into a liquid. Water can, under the right circumstances, sublimate, though it usually melts at temperatures above 0 degrees Celsius or 32 degrees Fahrenheit. Carbon dioxide (CO2), however, is very different. The conditions that determine whether CO2 melts or sublimates are both temperature and atmospheric pressure.

Answer:

4.82 g

Explanation:

To solve this problem we'll use the definition of molarity:

We are given the volume and concentration (keep in mind that 100mL=0.100L):

Now we calculate the number of NaCl moles required:

Then we convert 0.0825 NaCl moles into grams, using its molar mass:

Answer:

An increase in the temperature of a liquid causes an increase in the average speed of its molecules. As the temperature of a liquid increases, the molecules move faster thereby increasing the liquid's kinetic energy.

Answer:

A. Cell

Explanation:

Cells are basic units of structure and function in living things. This means that cells form the parts or an organism and carry out all of the an organism's processes, or functions.

Answer:

The answer to your question is given below

Explanation:

We'll begin by converting 500 cm³ to L. This can be obtained as follow:

1000 cm³ = 1 L

Therefore,

500 cm³ = 500 cm³× 1 L / 1000 cm³

500 cm³ = 0.5 L

Next, we shall determine the number of mole of Na₂CO₃ in the solution. This can be obtained as follow:

Volume = 0.5 L

Molarity = 2 M

Mole of Na₂CO₃ =?

Molarity = mole /Volume

2 = Mole of Na₂CO₃ / 0.5

Cross multiply

Mole of Na₂CO₃ = 2 × 0.5

Mole of Na₂CO₃ = 1 mole

Finally, we shall determine the mass of 1 mole of Na₂CO₃. This can be obtained as follow:

Mole of Na₂CO₃ = 1 mole

Molar mass of Na₂CO₃ = (23×2) + 12 + (16×3)

= 46 + 12 + 48

= 106 g/mol

Mass of Na₂CO₃ =?

Mass = mole × molar mass

Mass of Na₂CO₃ = 1 × 106

Mass of Na₂CO₃ = 106 g

Thus, to prepare the solution, weigh 106 g of Na₂CO₃ and dissolve in 500 cm³ (i.e 0.5 L) of water.

Explanation:

C3H8 + 502 ----> 3CO2 + 4H20

4NH3+7O2------> 4NO2+6H2O

2Al(NO3)3 + 3Na2S -------> Al2S3+6NaNO3

Answer:

check the pdf hope it helps :)

Explanation:

Answer: moles = 0.0799305403604264

Explanation:

Answer:

a simple voltaic cell is made by immersing one zinc plate and one copper plate inside water diluted sulfuric acid solution.

Answer:

84.3 g of nitrogen triiodide is the theoretical yield.

Explanation:

Hello there!

In this case, according to the chemical reaction:

[tex]N_2 + 3I_2 \rightarrow 2NI_3[/tex]

It is possible to compute the theoretical yield of nitrogen triiodide by each reactant via stoichiometry as shown below:

[tex]m_{NI_3}^{by\ N_2}=4.49gN_2*\frac{1molN_2}{28.01gN_2} *\frac{2molNI_3}{1molN_2}*\frac{394.72gNI_3}{1molNI_3} =126.55gNI_3\\\\m_{NI_3}^{by\ I_2}=81.3gI_2*\frac{1molI_2}{253.81gI_2} *\frac{2molNI_3}{3molI_2}*\frac{394.72gNI_3}{1molNI_3} =84.29gNI_3[/tex]

Therefore, we infer that the smallest amount is the correct theoretical yield as it comes from the limiting reactant, in this case, diatomic iodine as it yields 84.3 g (three significant figures) of nitrogen triiodide as the theoretical yield; incidentally, nitrogen acts as the excess reactant.

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Answer:

68,400

Explanation:

Answer:

0.13475 mol

Explanation:

From this question sally knows that n= 2

MCln = MCl

[Mn+] using nernst equation = 8.279

The volume of the resulting mixture Mn+ = 8.138 ml

The number of moles mn+ =

8.279 x 8.138

= 67.375mmol

= 0.067375

Since n = 2

The mold of cl- that must be dissolved in the compartment

= 0.067375 x 2

= 0.13475 mols

Answer:

a. n = 3

b. n = 4

Explanation:

n is just the number in front of the orbital, as n represents the energy level of the orbital.

Answer:

1. n=3

2.n=4

Explanation:n is the number infront of the orbital that representgsthe energy level

Answer:

C. -486 kJ/mol

Explanation:

Enthalpy change equals bonds broken (reactants) minus bonds formed (products)

Bonds broken = 2 H-H bonds + 1 O=O double bond = 2(436) +498 = 1,370 kJ/mol

Bonds formed = 4 O-H bonds = 4(464) = 1,856 kJ/mol

Bonds broken - bonds formed = 1,370 - 1,856 = -486 kJ/mol

Answer:

3

Explanation:

3 different elements are found

Mg - magnesium

O -oxygen

H - hydrogen

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Answer: 3

Explanation:

Explanation:

Two different elements have similar chemical properties when they have the same number of valence electrons in there outermost energy level. Elements in the same column of the periodic table have similar chemical properties.

Answer:

spring tides is the correct answer of your question

The relative atomic mass of Ne = 20.2. Therefore 20.2 g of neon contains 6.022 × 1023 Ne atoms.

Answer:

I believe 10

Explanation:

if i'm wrong report my answer so it gets deleted and someone else can answer

Answer:

A disease caused by a plasmodium parasite, transmitted by the bite of infected mosquitoes.

The severity of malaria varies based on the species of plasmodium.

Symptoms are chills, fever, and sweating, usually occurring a few weeks after being bitten.

People traveling to areas where malaria is common typically take protective drugs before, during, and after their trip. Treatment includes antimalarial drugs.

Explanation:

Answer:

A for growth and body repair

Explanation:

B, C, and D don't have anything to do with animals.

Answer:

Electrons are shared when ionic bonds are formed

The statement which describes an ionic bond formation is  " a metal donates one or more of its electron to a non-metal.

An ionic bond is formed between two atoms by electron donating by one atom and gaining by the second atom. The electron donating element is electropositive and the electron accepting one is electronegative.

Normally the electropositive elements are metals of 1st or 2nd group of periodic table. They can make bond with non-metals like halogens and other electronegative elements like nitrogen, oxygen etc.

Therefore, the force of attraction which binds two atoms together in an ionic bond is formed by electron donation by a metal to a non-metal.

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Answer:

is

Explanation:

because

Answer:

the pig's average speed is 7 m/s

The average speed of a moving body is the ratio of the distance travelled to the time of travel. Here, the speed of the pig running 46 meters in 6 seconds is 7.6 m/s.

The speed of an object is a physical quantity that measures the distance travelled by the object per unit time. Hence, it is the ratio of distance travelled to the  time taken for the travel. The rate of speed is called velocity. Bot are having the standard unit of m/s.

Given that,

distance covered by the pig = 46 meters

time taken = 6 seconds

speed  = distance/time.

Average speed of the pig = 46 meters/ 6 seconds = 7.6 m/s.

Therefore, if the small pig runs 46 meters in 6 seconds, it is having an average speed of 7.6 m/s.

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Answer:

[tex]58.48^{\circ}\text{C}[/tex]

Explanation:

[tex]P_1[/tex] = Initial pressure = 2.77 atm

[tex]V_1[/tex] = Initial volume = 263 mL

[tex]T_1[/tex] = Initial temperature = [tex]47^{\circ}\text{C}=(47+273.15)\ \text{K}[/tex]

[tex]P_2[/tex] = Final pressure = 3.87 atm

[tex]V_2[/tex] = Final volume = 197 mL

[tex]T_2[/tex] = Final temperature

We have the relation

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\\\Rightarrow T_2=\dfrac{P_2V_2}{P_1V_1}\times T_1\\\Rightarrow T_2=\dfrac{3.87\times 195}{2.77\times 263}\times (47+273.15)\\\Rightarrow T_2=331.63\ \text{K}=331.63-273.15\\\Rightarrow T_2=58.48^{\circ}\text{C}[/tex]

The final temperature will be [tex]58.48^{\circ}\text{C}[/tex].

Answer: The suspected and crime scene fingerprint patterns are similar which means they belong to the same individual.

Explanation:

A:  Ending ridge between two lines forming a loop like structure common in both suspected and crimes scene patterns.

B: Bifurcation which includes the formation of fork like shape of the ridge.

C: Island is a dot or point like structure which is common in both patterns.

D: It includes delta which is seen in the case of loop and whorl patterns of the fingerprint in loop there is only one delta and in case of whorl there are two deltas. The delta have an island and a bifurcation in it which is common in both patterns of the fingerprints.

E: Intersection occurs when two ridges changes their directions. It is common in the two patterns.

Answer:

3rd statment

Explanation:

ray 1 and 2 are same vertical line

Answer: C:  Ray 1 and Ray 2 make the same angle with the vertical line.

Explanation: