What is the mass in grams of 0.0015 mol of aspirin (C9H8O4)

Answer:

The spectroscope scale is illuminated so that one can know exactly where the wavelengths of the lines are falling along.

The heat of vaporization of CH3CN is obtained from the question as 25 KJ/mol.

We can obtain the number of moles from;

PV = nRT

P = 1 atm

V = 1.17 L

n = ?

R = 0.082 atm LK-1mol-1

T = 81.6 °C + 273 = 354.6 K

n = PV/RT

Substituting values;

n =  1 atm × 1.17 L/0.082 atm LK-1mol-1 × 354.6 K

n = 0.04 moles

Using; q = n·ΔHv

q = Heat absorbed

n = number of moles

Hv  = Heat of vaporization

ΔHv = q/n

ΔHv = 1.00 × 10^3/0.04

ΔHv = 25 KJ/mol

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Explanation:

The crystal size of an igneous rock is described as it's texture

Answer:

Explanation:

1 Electrolytes, particularly sodium, help maintain fluid balance through osmosis. Osmosis is a process where water moves through the wall of a cell membrane from a dilute solution (more water and fewer electrolytes) toward a more concentrated solution (less water and more electrolytes).

2 acid base balance in the body

our body's pH balance, also referred to as its acid-base balance, is the level of acids and bases in your blood at which your body functions best. The human body is built to naturally maintain a healthy balance of acidity and alkalinity. The lungs and kidneys play a key role in this process.

Answer:

the answer is 319 mph

Explanation:

you do 239/.75 (45 minutes will get you a different answer)

Answer:

Non-redox, double displacement

Explanation:

it's the only answer that have double displacement

tell me if it was right

Answer:

there is two mixture homogeneous and heterogeneous mixture

ok

The names of the substances for the reactants in the chemical equation 2H₂ + O₂ → 2H₂O are; Hydrogen gas (H₂) and Oxygen gas (O₂). Option A and C is correct.

Hydrogen gas (H₂) - This is the molecular form of hydrogen, consisting of two hydrogen atoms bonded together.

Oxygen gas (O₂) - This is the molecular form of oxygen, consisting of two oxygen atoms bonded together.

In a chemical equation, the reactants are the substances that undergo a chemical reaction to form new products. In this case, the reactants are hydrogen gas (H₂) and oxygen gas (O₂). The arrow (→) in the equation represents the direction of the reaction, indicating that hydrogen gas and oxygen gas react to form water (H₂O).

The coefficient 2 in front of H₂ and H₂O indicates that two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water. The balanced chemical equation shows the stoichiometry of the reaction, indicating the number of molecules of each reactant and product involved in the reaction.

Hence, A. C. is the correct option.

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--The given question is incomplete, the complete question is

"Choose the names of the substances for reactants of the equation

2H₂ + O₂ → 2H₂O Options; A) Hydrogen B) Water C) Oxygen."--

Answer:

I want to say (A) but i also want to say (C) but i can be wrong. most likely (C)

Explanation:

hope this helps lol and have a great day

Answer:

honestly this is kind of an opinionanated question because some people think that the vaccine dosen't work. Like I think that, but some other people might think differently so im gonna go with answer c.

Explanation:

Answer:

I don't know what you're saying cuz give me the brainless answer please

Answer:

1G

Explanation:

Answer:NaF is ionic. NF3 is covalent. SiF4 is ionic. CaF2 is Ionic and  NH4F is also ionic. Ionic compounds transfer electrons whereas covalent compounds share electrons hence the word "co". Also, ionic compounds are formed with metal and nonmetal. Where a covalent is with 2 nonmetals. Only ionic compounds would produce fluoride in water because ionic compounds can dissolve in water and covalent compounds cant.

The compounds that can be used for the release of fluorine in water are NaF, [tex]\rm SiF_4[/tex], [tex]\rm CaF_2[/tex], and [tex]\rm NH_4F[/tex].

The ionic compounds are formed by the transfer of electrons between the atoms of the compounds. The ionic bonds are weaker and are easy to dissociate in the aqueous solution.

The covalent compounds are formed by the sharing of electrons between the atoms. Since there is sharing, there has been a strong bond, that has been hard to dissociate.

The Mayor has to release Fluoride in the water, thus ionic compounds are preferred that have the easy release of fluorine.

From the given compounds:

Thus the compounds that can be used for the release of fluorine in water are NaF, [tex]\rm SiF_4[/tex], [tex]\rm CaF_2[/tex], and [tex]\rm NH_4F[/tex].

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Answer:

4.2 atm

Explanation:

Dalton’s Law of Partial Pressures

PA = XA(PT)

Partial pressure of A = mole factor of gas A x total pressure of all gases

PA = 0.21 atm

XA = 0.050

PT= ?

0.21atm= 0.050(PT)

0.21/0.050 = PT

PT = 4.2 atm

The total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.

The partial pressure of a gas can be calculated using Dalton's law of partial pressure equation as follows:

PA = XA(PT)

Where;

Based on the information given in this question;

0.21 atm = 0.050 (PT)

0.21/0.050 = PT

PT = 4.2 atm

Therefore, the total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.

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Answer:Cl2

Explanation:each gas is 1 gm and has the same P andT. The gas with the highest molar mass will have the lowest volume with least moles. Cl2 wins the prize

Answer:

Explanation:

lead 3 is correct!!!!!

Answer: Volume. Litre (L) and millilitre (mL) are non-SI units, but because they are easier to write and pronounce, they are in common use.

Explanation: I think the explanation is the answer also

Answer:

Covalent bond

Explanation:

All the characteristics of a Covalent bond are being described.

When, a substance boils at 45degree C. Then, the most likely bond type for the given substance is a covalent bond. Option A is correct.

Liquid at Room Temperature: The fact that the substance is a liquid at room temperature suggests that the intermolecular forces holding its molecules together are relatively weak. Covalent compounds often have weaker intermolecular forces compared to ionic or metallic compounds.

Doesn't Conduct Electricity When Dissolved in Water: Covalent compounds, in general, do not conduct electricity when dissolved in water. This is because they do not dissociate into ions in solution, which is necessary for electrical conductivity. Ionic compounds, on the other hand, typically dissociate into ions and can conduct electricity in solution.

Boils at 45°C: The relatively low boiling point (45°C) indicates that the intermolecular forces in the substance are weak. Covalent compounds tend to have lower boiling points compared to ionic or metallic compounds, which often have stronger bonding.

Considering these factors, the substance is likely held together by covalent bonds, which involve the sharing of electrons between atoms. This allows for the formation of discrete molecules with weak forces between them.

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"The substance is a liquid at room temperature.-When you dissolve it into water, it doesn't conduct electricity.-The substance boils at 45 oC. Which is the most likely bond type for this substance? Choices: A) Covalent bond B) Metallic bond C) Ionic bond D) Hydrogen bonding E) Cation-pi bond."--

Answer:

wavelength is 0.77 m

Explanation:

wavelength is y is equal to FB is equal to 44 0340

The average mass of a marble can be determined by dividing the total mass of the marbles by the total number of marbles: average mass of a marble.

To find the density of any object, you need to know the Mass (grams) of the object, and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get an object's Density.

Use the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V).

To determine the density of a marble, we must know its mass and volume.

In order to determine the density of any substance we need to know its mass and volume.

Let's understand "Density".

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Answer:

2.04 Thermal Energy and Chemical Change Lab Report

Explanation:

Answer:

in order to reduce and simplify the study of the animals

to be able to group animals in their appropriate groups

Explanation:

when we classify organisms that means that we take a large number of organisms and group them to a single and correct group that will help the scientists across the world to identify organisms easily

Answer:

5.01 moles

Explanation:

Calculate the number of moles in 400g of Tio2

first, write the formulas correctly

Calculate the number of moles in 400g of TiO2

capitalize the first letter of your elements

the molar mass of TiO2 is

47.88 +2X16.00 =47.88  +32.00 = 79.88 gm/mole

(to 3 sig fig = 79.9 gm/mole

400 gm/79.9 gm/mole = 400/79.9 mole gm/gm =

400/79.9 moles = 5.01 moles

Answer:

At the end, no light passes through.

Explanation:

First, when white light enters a blue filter, only blue light is allowed to pass through, and all the other components of light are absorbed. When blue light then reaches the yellow filter, it absorbs the blue light, because it is designed to allow only the yellow component of the light to pass through. White light consists of the seven rainbow colours: red, orange, yellow, green, blue, indigo and violet.

Answer:

8.1 M

Explanation:

What is the initial concentration of a solution if 40.0 mL is diluted to make 720 mL of a 0.45 M solution?

LET Y = INITIAL CONCENTRATION

SO

Y TIMES 40/720 = 0.45 m

SO

Y= (0.45) X 720/40=

0.45 X 72/4 =

0.45 X 18 =8.1 M

Concentration is related to the mass and volume. 8.1 M  initial concentration of a solution is required if 40 ml is diluted to make 720 ml of a 0.45 M solution.  

The first measured concentration of a compound in a substance is called as initial concentration. Initial concentration also measure with the help of molarity.

Write out the equation C = m ÷ V, where m is the mass of the solute and V is the total volume of the solution. Substitute  the values you found for the mass and volume, and divide them to find the concentration of your solution.  

Let X is the initial concentration,

so, X times 40 ÷ 720 = 0.45

X = ( 0.45 ) × ( 720÷40)

= 0.45 × 18

= 8.1 M

Hence, 8.1 M  initial concentration of a solution is required .

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B. dust particles are absorbing light

When light travels through a medium, it interacts with the medium and this causes the scattering of light. - Photons are absorbed by molecules in the medium, and this causes the molecules to vibrate and then re-emit the photons. ... - The scattering of light increases with frequency

Answer:

C

Explanation:

the answer is C. dust particels are reflecting light. hope this helps

Answer:

It depends

Explanation:

This could vary depending on the exact temp, time and minerals. something with alot of salt boils quicker than something without it, so 10.5 grams?

The particular temperature, the passage of time, and the minerals could all affect the amount of grams of liquid water.

Minerals are defined as a naturally crystallized element or chemical compound that was created through geological processes. Natural materials are those that form on their own, such as minerals. Minerals don't droop, melt, or evaporate since they are solids. In contrast to the carbon compounds found in living organisms, minerals are inorganic. Minerals are crystalline: They have a unique atomic composition and arrangement.

Temperature is defined as a measure of hotness or coldness expressed in terms of any number of arbitrary scales that shows the direction that heat energy will naturally flow, i.e., from a hotter body to a colder body. The three temperature scales that are now in use are Kelvin, Celsius, and Fahrenheit. Food, beverages, agriculture, and medical care for both people and animals all depend heavily on temperature.

Thus, the particular temperature, the passage of time, and the minerals could all affect the amount of grams of liquid water.

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