What is the empirical formula for a compound that has 57.5%
Na, 40.0% 0, and 2.5% H?
a
Naz(OH)4
b
Na(OH)2
С
Na(OH)
d
Naz(OH)

Answer:

4.99 × 10³ g/mol

Explanation:

Step 1: Given  and required data

Step 2: Calculate the molarity (M) of the solution

The osmotic pressure is a colligative pressure. For a covalent compound, it can be calculated using the following expression.

π = M × R × T

M = π / R × T

M = 0.305 atm / (0.0821 atm.L/mol.K) × 298 K

M = 0.0125 M

Step 3: Calculate the moles of solute (n)

We will use the definition of molarity.

M = n / V

n = M × V

n = 0.0125 mol/L × 1.000 L = 0.0125 mol

Step 4: Calculate the molar mass of the compound

0.0125 moles of the compound weigh 62.4 g. The molar mass is:

62.4 g/0.0125 mol = 4.99 × 10³ g/mol

Answer:

0.3025 moles of CO₂  are produced

Explanation:

Reaction is: Na₂CO₃ (aq) + 2 HF (aq) → H₂O (l) + CO₂ (g) + 2 NaF (aq)

It is correctly ballanced.

If the given information stays that the excess amount is on the sodium carbonate, the HF is the limiting reagent.

We see that stoichiometry is 2:1. Moles of produced CO2, will be the half, than the original amount, we have.

Firste step: We convert the mass to moles

12.1 g . 1mol / 20g = 0.605 moles of HF

2 moles of HF can produce 1 mol of CO₂

0.605 moles of HF will produce (0.605 . 1) /2 = 0.3025 moles of CO₂

Answer:

76.1%

Explanation:

The reaction that takes place is:

First we determine how many moles of each reactant were added:

Thus K₂SO₄ is the limiting reactant.

Using the moles of the limiting reactant we calculate how many moles of BaSO₄ would have been produced if the % yield was 100%:

Then we convert that theoretical amount into grams, using the molar mass of BaSO₄:

Finally we calculate the % yield:

Answer:

[tex]20.33\times 10^{26}[/tex] atoms

Explanation:

Given that,

Given mass = 13200 g

Molar mass of potassium = 39.0983 g/mol

Let there are n number of moles. It is equal to mass divided by molar mass. It is equal to :

[tex]n=\dfrac{13200}{39.0983 }\\\\=337.61\ \text{mol}[/tex]

Let there are x atoms in 13200 g of potassium (k). It can be calculated  :

[tex]x=n\times N_A\\\\=337.61\times 6.023\times 10^{23}\\\\=20.33\times 10^{26}[/tex]

So, there are [tex]20.33\times 10^{26}[/tex] atoms.

Answer:

61.9mL

Explanation:

Given parameters:

Initial volume  = 49.7mL

Initial temperature  = 20°C  = 293K

Final temperature  = 92°C  = 365K

Unknown:

Final volume  = ?

Solution:

To solve this problem, we simply apply the Charles's law which states that "the volume of a fixed mass of a gas varies directly as it absolute temperature if the pressure is  constant";

        [tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]  

V and T are volume and temperature values

1 and 2 are initial and final states

 Now insert the parameters and solve;

      [tex]\frac{49.7}{293}[/tex]   = [tex]\frac{V2}{365}[/tex]  

        V2  = 61.9mL

Answer:1)1.99 M

Explanation:

Molarity  is given as = moles solute/Liter solution

The solute which is LiOH is already given in moles as 1.495 moles

Given that solution  is  750 mL,  we convert to liters.

Liters of the solution=  mL of the solution   x (1 L/1000 mL)

750 mL x (1 L/1000 mL)

0.75 L

Molarity = moles solute/Liter solution

Molarity = 1.495 moles of LiOH/0.75 L of solution

Molarity = 1.99M

The molarity of this solution is 1.99M (moles per liter).

Answer:

The amount of energy in molecules of matter determines the state of matter.

Explanation:

The amount of energy in molecules of matter determines the state of matter. Matter can exist in one of several different states, including gas, liquid, or solid-state.

Answer:

The state of a substance depends on the space between its particles and on the way in which the particles move. The more solid it is the tighter the particles.

Answer: -2 because it gains 2 electrons

Explanation:

An ion is considered to be an atom which is formed by gain or loss of electrons.

The ions are classified into two which are called the cation and anion.

The cation is classified as the positive charge formed by loss of electrons.

The anion is classified as the negative charge ion formed by gain of electrons.

On gaining two electrons, the atom would occupy -2 charge.

Answer:

89.1942....

Explanation:

abundance x mass on each one, the added all together:

77.742+6.201+5.251

Answer:

I think that is electrons and nucleus

Explanation:

It makes sense

Answer:

Protons and neutrons :)

Copper (ii) nitrate is deliquescent and absorbs moisture from the atmosphere. Therefore, no crystals of copper (ii) nitrate are formed after several days.

Deliquescent substances are substances which when exposed to the atmosphere absorb moisture from the atmosphere to form solutions.

During the preparation of copper (ii) nitrate from copper (ii) carbonate and dilute nitric acid, the product formed is copper (ii) nitrate solution and carbon dioxide is evolved.

The equation of the reaction is given below:

CuCO₃ + HNO₃ → Cu(NO₃)₂ + H₂O + CO₂

In the preparation of copper (II) sulfate crystals, the procedure involves  adding copper (ii) carbonate to dilute sulfuric acid and warming the resulting solution to drive off some of the water and then leaving the solution to crystallize.

However, unlike copper (ii) sulfate, copper (ii) nitrate is deliquescent, and as such, it absorbs ,moisture continuously from the atmosphere. Thus, no crystals of copper (ii) nitrate are formed after several days.

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Answer:

carbohydrates, lipids, proteins, and nucleic acids.

Explanation:

Carbohydrates serve several key functions in your body. They provide you with energy for daily tasks and are the primary fuel source for your brain's high energy demands.

The functions of lipids include storing energy, signaling, and acting as structural components of cell membranes. Lipids have applications in the cosmetic and food industries as well as in nanotechnology.

Protein has many roles in your body. It helps repair and build your body's tissues, allows metabolic reactions to take place and coordinates bodily functions. In addition to providing your body with a structural framework, proteins also maintain proper pH and fluid balance.

The functions of nucleic acids have to do with the storage and expression of genetic information. Deoxyribonucleic acid (DNA) encodes the information the cell needs to make proteins. A related type of nucleic acid, called ribonucleic acid (RNA), comes in different molecular forms that participate in protein synthesis.

Answer:

Explanation:

1) The ΔH shows the heat of reaction of the reaction illustrated in the question and the negative sign shows the reaction is an exothermic reaction, meaning heat is released in this reaction. The amount of heat released in this reaction is 851.5 kilojoules per mole of Al₂O₃ produced.

2) The thermal energy of this reaction is however very low when compared to the energy released when 2 moles of protons and 2 moles of neutrons combine to form 1 mole of alpha particles. This is because, the reaction illustrated in the (1) above is a normal chemical reaction while the one that involves the protons and neutrons (as described in this section 2) is a nuclear reaction which involves large amount of energy. Nuclear reactions usually involve way larger amount of energy than ordinary chemical reactions.

Answer:

Yeast is living.

Explanation:

Yeast is a type of fungus used in making bread. Fungus is a group of living organisms.

Answer:

4.67 atm

Explanation:

Step 1: Given data

Step 2: Convert "T" to Kelvin

We will use the following expression.

K = °C + 273.15

K = 27.0 °C + 273.15 = 300.2 K

Step 3: Calculate the moles of Ar

The molar mass of Ar is 39.94 g/mol.

4.73 g × 1 mol/39.94 g = 0.118 mol

Step 4: Calculate the partial pressure of Ar

We will use the ideal gas equation.

pAr × V = nAr × R × T

pAr = nAr × R × T / V

pAr = 0.118 mol × (0.0821 atm.L/mol.K) × 300.2 K / 2.00 L

pAr = 1.45 atm

Step 5: Determine the total pressure of the gaseous mixture

The total pressure of the gaseous mixture is equal to the sum of the partial pressures of the individual gases.

P = pAr + pHe = 1.45 atm + 3.22 atm = 4.67 atm

Answer:

d) none of the above

Explanation:

The law that describes the relationship between pressure and volume of an ideal gas (under constant temperature and amount of substance) is Boyle's law.

It states that pressure is inversely proportional to the volume. This would mean that a graph of P vs 1/V would be a line.

See the attached picture for a graph of P vs V.

A plot of pressure VS. volume for an ideal gas will result in d) none of the above

The following things should be considered:

Therefore we can conclude that a plot of pressure VS. volume for an ideal gas will result in d) none of the above

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Moving material along certain gradients is necessary for osmosis, diffusion, filtration, and the transport of ions away from similar charges.

Osmosis is the flow of solvent molecules over a semi-permeable membrane from an area of lower concentration to a region of higher concentration Molecules diffuse when they travel from one area of higher concentration to another area of lower concentration The process of filtering involves moving liquid substances through a separating material known as a filter in order to separate solid particles from liquid. Due to the difference in pressures between the solid and liquid substances, this process is made feasible. Because of the difference in electrical potentials between the charges, ions move away from like charges.

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Answer:

Explanation:

The height of the object can be found by using the formula

[tex]h = \frac{p}{mg } \\ [/tex]

where

p is the potential energy

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

[tex]h = \frac{23048}{39 \times 10} = \frac{23048}{390} \\ = 59.0974...[/tex]

We have the final answer as

Hope this helps you

Based on the periodic trends in the periodic table, the most reactive element is oxygen; option C

Periodic trends in the periodic table refers to the periodic variation in the properties of the elements which is observed in the periodic table as one moves across the periodic table from left to right across a period or down a group in the periodic table.

This regular variation is also known as periodicity in the properties of elements.

Some of the periodic trends observed in the periodic table include:

Considering the most reactive element based on the periodic trends:

Titanium, Ti is a transition metal whose reactivity is intermediate as it is found in between group 2 and 3 of the periodic table

Silicon is metalloid which is not very reactive

Oxygen, O is a very reactive non-metal found in group 6A

Argon, is a noble gas which is almost inert.

Therefore, the most reactive element is oxygen.

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b bbbbbbbbbbbbbbbbbbbbbbbbbb

To calculate the molar mass of  [tex]\rm Cr_3(AsO_4)^2[/tex], we need to determine the sum of the atomic masses of all the individual atoms in the compound.

The atomic masses of the elements are as follows:

Cr (chromium) = 52.00 g/mol

As (arsenic) = 74.92 g/mol

O (oxygen) = 16.00 g/mol

Now, let's calculate the molar mass of [tex]\rm Cr_3(AsO_4)^2[/tex]:

Molar mass of Cr3(AsO4)2

= (3 * molar mass of Cr) + (2 * molar mass of As) + (8 * molar mass of O)

                        = (3 * 52.00 g/mol) + (2 * 74.92 g/mol) + (8 * 16.00 g/mol)

                        = 156.00 g/mol + 149.84 g/mol + 128.00 g/mol

                        = 433.84 g/mol

Therefore, the molar mass of  [tex]\rm Cr_3(AsO_4)^2[/tex] is 433.84 g/mol.

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Taking into account the definition of density, the mass of grlycerol required is 3.9816 g.

Density is a quantity that is defined as the measurement of the amount of mass in a given volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

You can observe that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

1.26 g/cm³= mass÷ 3.16 cm³

Solving:

mass= 1.26 g/cm³  ×3.16 cm³

mass= 3.9816 g

In summary, the mass of grlycerol required is 3.9816 g.

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Answer:

40$$$

Explanation:

Reason: 300 miles × 1gallon30miles × $4.001gallon = $40

Answer:

In a climatological sense, dryness is a function of both annual rainfall and evaporation

Explanation:

sjjdudiejsdiss jdjdidhfbvbjsjsiosjdd.

Answer:

The answer is "Option b".

Explanation:

[tex]\to \text{number of moles} = \frac{\text{number of atoms}}{\text{avogadro number}}[/tex]

                               [tex]= \frac{7.0 \times 10^{19}}{6.0221 \times 10^{23}}\\\\= 1.16 \times 10^{-4} \ moles\\\\ =1.2 \times 10^{-4} \ moles[/tex]

[tex]\to \text{sample mass}= \text{number of moles} \times \text{molar mass}[/tex]

                        [tex]=1.16 \times 10^{-4}\times 58.9\\\\=0.00685 \\\\ = 6.85\ g[/tex]

hey sisterrrrrrrrrr its ginger charles here i hear you looking for the answer well this is your lucky day the answer is

Explanation:

The concentration of Bovine Hb with absorbance 0.7 at 570 nm has been 2.264 [tex]\mu[/tex]M.

According to Beer's law, the absorbance of the sample can be given by:

Absorbance = Extinction coefficient [tex]\rm \times[/tex] concentration [tex]\times[/tex] path length

The Bovine Hb has the extinction coefficient = 30910 L/mol/cm

The absorbance = 0.7

The path length has been 1 cm.

The concentration of the Bovine Hb can be given as:

0.7 = 30910 [tex]\times[/tex] concentration [tex]\times[/tex] 1

The concentration of Bovine Hb = 2.264 [tex]\rm \times\;10^-^6[/tex] moles/L

The concentration of Bovine Hb = 2.264 [tex]\rm \mu[/tex]moles/L

The concentration of Bovine Hb = 2.264 [tex]\mu[/tex]M.

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Answer:

I got

−

902 kJ

for the reaction as-written. How would you rewrite this into

kJ/mol NH

3

?

The standard molar enthalpy of formation is for the formation of

1 mol

of product from its elements as they exist in nature at

25

∘

C

and

1 atm

. For example...

1

2

N

2

(

g

)

+

3

2

H

2

(

g

)

→

NH

3

(

g

)

,

Δ

H

∘

f

(

NH

3

(

g

)

)

=

−

45.9 kJ/mol

But that also means formation of elements in their standard states must yield zero enthalpy change:

1

2

O

2

(

g

)

→

1

2

O

2

(

g

)

,

Δ

H

∘

f

(

O

2

(

g

)

)

=

0

That means we can simply derive from Hess's law and that fact to get:

Δ

H

∘

r

x

n

=

∑

P

n

P

Δ

H

∘

f

,

P

−

∑

R

n

R

Δ

H

∘

f

,

R

where

n

indicates the mols of product

P

or reactant

R

. Here we actually have just summed many formation reactions together that we know have

Δ

H

∘

r

x

n

=

Δ

H

∘

f

.

Here we have:

Δ

H

∘

r

x

n

=

[

4 mols NO

(

g

)

⋅

Δ

H

∘

f

,

N

O

(

g

)

+

6 mols H

2

O

(

g

)

⋅

Δ

H

∘

f

,

H

2

O

(

g

)

]

−

[

4 mols NH

3

(

g

)

⋅

Δ

H

∘

f

,

N

H

3

(

g

)

+

0 kJ/mol

]

where we have set a zero contribution

O

2

(

g

)

right off the bat.

=

[

4 mols NO

(

g

)

⋅

91.3 kJ/mol

+

6 mols H

2

O

(

g

)

⋅

−

241.8 kJ/mol

]

−

[

4 mols NH

3

(

g

)

⋅

−

45.9 kJ/mol

+

0 kJ/mol

]

=

[

−

1085.6 kJ

]

−

[

−

183.6 kJ

]

=

−

902 kJ

for the reaction as-written.

Explanation: