what information do you obtain from molecular formula?​

Answer:

Mass = 0.96 g

Explanation:

Given data:

Volume of oxygen = 840cm³

Temperature = at room = 25°C

Pressure = at room = 1 atm

Mass of oxygen = ?

Solution:

Volume of oxygen = 840 cm³ × 1 L /1000 cm³ = 0.84 L

Temperature  = 25 +273.15k = 298.15 K

Formula:

PV = nRT

n = PV/RT

R = 0.0821 atm.L/mol.K

n = 1 atm × 0.84 L / 0.0821 atm.L/mol.K ×  298.15 K

n = 0.84 atm.L / 24.48 atm.L/mol

n = 0.03 mol

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 0.03 mol × 32 g/mol

Mass = 0.96 g

Answer:

you have a 3.17molal solution: This is 3.17mol CaCl2 dissolved in 1 litre of water. Make this solution.  

Molar mass CaCl2 = 110.9848 g/mol

3.17mol = 3.17*110.9848 = 351.822g  

Total mass = 1000g H2O + 351.822g CaCl2 = 1,351.822g  

Volume of this solution:

Volume = mass / density

Volume = 1,351.822/1.24  

Volume = 1,090.2 mL  

You have 3.17mol CaCl2 dissolved in 1,090.2 mL solution

Mol CaCl2 dissolved in 1000mL solution =  1000/1090.2*3.17 = 2.91 mol CaCl2  

Molarity of CaCl2 solution = 2.91M

Explanation:

The question is incomplete, the complete question is;

In the 1800s, a popular belief known as vitalism stated that life processes could not be explained by the laws of physics and chemistry,and were instead dictated by an independent life force. Which discovery most likely caused scientists to revise this hypothesis regarding the origin of life on Earth?

a. that inorganic compounds existed within live organisms

b. that organic compounds could be synthesized in a laboratory

c. that RNA could serve as a template to synthesize DNA

d. that self-replicating molecules existed inside cells

Answer:

b. that organic compounds could be synthesized in a laboratory

Explanation:

Vitalism is the belief that "living organisms are fundamentally different from non-living entities because they contain some non-physical element or are governed by different principles than are inanimate things"(wikipedia).

This theory held that the molecules involved in life processes could not be synthesized in the laboratory.

All these were upturned after Fredrich Whöler's synthesis of urea in 1828. He was able to show that molecules involved in life process can also be synthesized in the laboratory. This gave rise to modern synthetic organic chemistry.

Answer:

See explanation below (Brainlist please)

Explanation:

First of all, we need to understand what is an acidic hydrogen.

An acidic hydrogen, is the atom of hydrogen which is more propense to undergo an acid base reaction, and form a stable ion or molecule in the process.

In other words, is the hydrogen that is more vulnerable to get substracted in an acid base reaction to form another compound.

Knowing this information, gives us an idea of how a molecule can be formed and which kind of compound is formed.

Now, in this question, we have 5 molecules. Each of them is either a ketone or aldehyde, so this mean that we have the carbonile group (C = O), which means that is easier to identify the acidic hydrogen. This is because the Carbonile group is an attractor group, so, it will attract the charges by inductive effect (in some cases by resonance), and the molecule is more stable.

This can be shown by drawing the enolate ion that is formed once the molecule undergo the acid base reaction. As it's an enolate form that we are looking for, then it means that the ketone or aldehyde is undergoing an electrofilic attack with a base. This base will substract the most acidic hydrogen to form a better and stable enolate. The acidic hydrogen and the enolate form can be seen in the attached picture.

a) In the case of acetaldehyde, the most acidic will be the hydrogen of carbon 2, because the hydrogen from the carbonile, once it's substracted, the charge of the carbon cannot be stabilized by resonance. Carbon 2 hydrogens, can do this job easily.

b) Propanal happens something similar to acetaldehyde, the terminal hydrogen cannot be substracted, and carbon 3, once the hydrogen is gone, the negative charge cannot be stabilized by resonance, so hydrogens of carbon 2 can do this.

c) in the case of acetone, is easier to look because we only have the C = O between two methyl group, so you can use either carbon 1 or 3 to do the job.

d) 4 heptanone the most acidic hydrogen would be carbon 3 or 5, because they are closer to the C=O and the ion can be stabilized by resonance.

e) Finally in ciclopentanone, the most acidic hydrogen would be carbon 2 or 5.

See picture for a better understanding.

Hope it helps.

Answer:

yes, the cells in the liguid is all congrating together.

Explanation:

Answer:

Alkali Metals: •are placed in group 1, • can be cut with a knife

Halogens: •are placed in group 17, • react vigorously with metals

Explanation:

Alkali metals are the metals found in group 1 of the periodic table. They have one outermost shell electron. They react with cold water vigorously to form alkalis and liberate hydrogen gas as well. They are very reactive metals and their reactivity increases on going down the group. They are soft and can be cut with a knife. Examples of alkali metals are lithium, sodium,potassium, rubidium,caesium, francium.

The Halogens are reactive non-metals placed in group 17 of the periodic table. They have seven outermost shell electrons. They are the most reactive non-metals react vigorously with metals by to form ionic compounds. They exist as diatomic molecules. They are found in nature mainly as salts because of their reactivity. Their reactivity decreases on going down the group. Examples of the halogens include fluorine, chlorine, bromine, iodine and astatine.

Answer:

all of the above

Explanation:

Answer:

i dont know

Explanation:

sorry

Answer:

compound

Explanation:

compound is something that consists of two or more element.

Answer:

3 * 10^-4  μg

Explanation:

Molar mass of Hg2Cl2 = 472.09 g/mol

Now;

number of moles = mass/molar mass = concentration * volume

So;

n =m/M = CV

m = MCV

C = 3.75 x 10^−6/μmolL or 3.75 x 10^−12 molL-1

M =472.09 g/mol

V= 170.0mL

m = 3.75 x 10^−12  * 472.09 * 170.0/1000

m = 3 * 10^-10 g or 3 * 10^-4  μg

Answer:

3 mol H2/2 mol N2

Explanation:

Mole ratios are basically from the numbers/coefficients in front of the element

Answer:

To obtain one mole of copper atoms (6.02 x 1023 atoms), ... mol Ag? (b) How many atoms of Ag are in 0.0342 mol Ag? 7 ... contain one S atom and two O atoms; calculate its molar mass.

Answer:

Solar energy is essentially the light and heat emitted from the sun

Answer:

[tex]m_{PbI_3}=383.05gPbI_3[/tex]

Explanation:

Hello!

In this case, since the reaction between lead and iodine is:

[tex]2Pb+3I_2\rightarrow 2PbI_3[/tex]

We can see there is 2:2 and 3:2 mole ratio between each reactant and the product; in such a way, for the limiting reactant we must compute the moles of lead (III) iodide yielded by each reactant first:

[tex]n_{PbI_3}^{by\ Pb}=135gPb*\frac{1molPb}{207.2gPb}*\frac{2molPbI_3}{2molPb} =0.652molPbI_3\\\\n_{PbI_3}^{by\ I_2}=338gI_2*\frac{1molI_2}{253.81gI_2}*\frac{2molPbI_3}{3molI_2} =0.888molPbI_3[/tex]

Thus, the limiting reactant is lead because it yields the fewest moles of product. Next, we compute the mass of lead (III) iodide by multiplying the produced 0.652 moles by its molar mass:

[tex]m_{PbI_3}=0.652molPbI_3*\frac{587.91gPbI_3}{1molPbI_3} \\\\m_{PbI_3}=383.05gPbI_3[/tex]

Best regards!

1. 1 mol=6.02.10²³ particles

[tex]\tt \dfrac{3.63\times 10^{23}}{6.02\times 10^{23}}=0.602~moles[/tex]

2. Molar mass = Total atomic mass of component

AlBr₃ = Ar Al + 3. Ar Br

AlBr₃ = 27 + 3. 80 = 267 g/mol

3. mass = mol x MW

MW MnCl₂  = 55 + 2.35.5=126 g/mol

mass = 31.6 x 126 =3981.6 g

4. at STP, 1 mol =22.4 L, so for 5.6 L :

[tex]\tt \dfrac{5.6}{22.4}=0.25~moles[/tex]

5. moles = mass : MW

MW CH₃OH = 12.1 + 4. 1 + 16.1 =32 g/mol

[tex]\tt moles=\dfrac{0.5}{32}=0.016[/tex]

6. 1 mol = 22.4 L at STP

1 mol = 6.02.10²³ particles

moles for  8.20 x 10¹⁴ molecules

[tex]\tt \dfrac{8.2\times 10^{14}}{6.02\times 10^{23}}=1.36\times 10^{-9}[/tex]

volume :

[tex]\tt 1.36\times 10^{-19}\times 22.4=3.05\times 10^{-8}~L[/tex]

The electrical energy required : 0.082 F

Given

1.000L of H₂ at 25°C and 1.00 atm

Required

Electrical energy

Solution

Redox reactions in water electrolysis :

Anode: 2H2O (l) → O2 (g) + 4H⁺ (aq) + 4e

Cathode: 4H2O (l) + 4e → 2H2 (g) + 4OH⁻ (aq)

Reaction: 2H2O → 2H2 (g) + O2 (g)

mol H₂ :

n = PV/RT

n = (1 atm x 1 L)/(0.082 x 298)

n = 0.041

From reaction at cathode : mol ratio of electron and H₂ = 4 : 2, so mol electrons :

= 4/2 x mol H₂

= 2 x 0.041

= 0.082

1 Faraday is the amount of electricity that is passed in the electrolysis cell to obtain 1 mole of electrons.

1 Faraday = 1 mole of electrons = 96500 Coulombs

So the energy required :

0.082 Faraday

Explanation:

Fundamentally the aluminum foil is a rectangular prism. It has a length, a width, and a thickness.

The volume of a rectangular prism is expressed as

[tex]V = l * w * h[/tex]

If we know the volume and two of the three dimensions, we can rearrange the equation to solve for the thickness.

[tex]h = V/(l*w)[/tex]

But we should also be sure to confirm our units.

A liter is defined as 1000 cm^3. Therefore a mL is equal to 1 cm^3.

You should convert the units of measure given in the problem statement such that the units are aligned. For example, 10.0mm will be 1 cm and 12.5m will be 1250 cm. This will give you a height in cm.

Answer:

You will form a solution

Explanation:

The sugar is added into the water, then the sugar will dissolve into the water.

Answer:

u got a me off guard and thought sum else, lol but um a marble?

Explanation:

Answer:

See answer below

Explanation:

In this case, I will put the original photo of this exercise, because we are missing one data. The first picture is the original exercise.

Now, according to this, we need to make a serial dilution of CO(NO₃)₂. We don't know the volume of this solution, but we do know the total volume of the preparing solution (In the picture states that the total volume will be 10 mL).

So, we know the final volume of the solutions to be prepared, so, le'ts use the expression that will help us to solve this:

C₁V₁ = C₂V₂

Where:

C₁: Concentration of the given solution (stock)

V₁: volume required to prepare the dilluted solution

C₂; Concentration of the dilluted solution

V₂: Total volume of the dilluted solution.

Now that we know the expression to use and the meaning of each value, let's prepare the solutions:

To prepare 10 mL of 0.1 M using a 0.25 M, we will replace these values in the above expression; from there, we will solve for V₁, that value will tell us the required volume to prepare solution 2, and then, by difference we can calculate the volume of water:

Volume of water (Vw) =V₂ - V₁  

Now replacing the values:

0.25V₁ = 0.1 * 10

V₁ = 1/0.25 = 4 mL

This means that we need 4 mL of the stock to prepare the 0.1 M of dilluted solution, therefore, the volume of water required is:

Vw = 10 - 4

Using these same steps for the other two solutions we will get V1 and V2 for both of them. In this case, I will go straight to the procedure without further explanation because it's the same of this one.

For solution 2:

0.1V₁ = 0.05 * 10

V₁ = 0.5/0.1

Vw = 10 - 5

Finally for solution 3:

V₁ = 0.01 * 10 / 0.05

Vw = 10 - 2 mL

Hope this helps

Answer:D. Tin

Explanation:

Explanation:

it is negative acceleration

Answer:

negative acceleration

Explanation:

Answer:

The hypothesis becomes a theory if the results support it is answer.

Explanation:

I hope it's helpful!

Answer:

J. the growth of trees

Explanation:

The growth of trees would be greatly impaired if the energy from the sun were stopped.

Plants generally use the energy from the sun to obtain their nourishment. This same process makes food available in the ecosystem.

Answer:

- Oil Energy is a Major Source of Pollution and Damage Made to the Environment Every Year.

- Oil Like the Other Fossil Fuels Is A Finite Resource.

- Emissions Produced by Oil Causes Acid Rain

-Plastic is One of the Products Obtained Through Oil Refining.

- Working in the Oil Sector Can Be a Dangerous Activity.

hope this is good enough :)

Answer:

Pros: Oil can easily be transported by a network of pipelines.

Oil-fired power stations can, in theory, be built almost anywhere.

The oil is burned to heat water and produce steam. This steam propels the blades of a turbine. This is attached to a generator, which produces electricity.

Cons: Oil is a non-renewable source of energy. This means that one day we will probably run out of crude oil.

Burning oil produces carbon dioxide gas. This is a greenhouse gas that contributes towards climate change.

Burning oil can pollute the air.

Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase.

Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.

Explanation:

Answer:

Gas to Solid

Explanation:

A condensation reaction goes from gas to solid

Condensation is a physical change which alters the physical properties of matter particularly the form and state. In a condensation reaction, a gas goes from solid to liquid.

It is the inverse of the sublimation reaction.

Answer:

Mass, temperature, and phase.

Heat produced =  -13588.956 kJ

Given

The reaction of combustion of Methane

CH4(g)+2O2(g)→CO2(g)+2H2O(g) ΔH∘rxn=−802.3kJ

271 g of CH4

Required

Heat produced

Solution

mol of 271 g CH₄ (MW=16 g/mol0

mol = mass : MW

mol = 271 : 16

mol = 16.9375

So Heat produced :

= mol x ΔH°rxn

= 16.9375 mol x −802.3kJ/mol = -13588.956 kJ