The molar mass of barium nitrate (ba(no3)2) is 261.35 g/mol. what is the mass of 5.30 × 1022 formula units of ba(no3)2? 0.0900 g 12.0 g 23.0 g 3,130 g

Answer:

advantages:

. The error due to weighing the solute can be minimised by using concentrated stock solution that requires large quantities of solute. 2. We can prepare working standards of different concentrations by diluting the stock solution which is more efficient since consistency is maintained

3. Some of the concentrated solutions are more stable and are less likely to support microbial growth than working standards used in the experiments.

Some possible public policies aimed at reducing the amount of carbon dioxide in the air is that companies should make use of new emissions technology to avoid air pollution.

What is air pollution?Air pollution is the release of substance that are dangerous or harmful to human health into the environment.

Excessive release of carbon dioxide into the atmosphere causes pollution and deplete our ozone layer.

One of the policy government have out in check is that all companies should purchase or make use of new emissions technology to avoid polluting the environment and causing harm to human health.

Therefore, some possible public policies aimed at reducing the amount of carbon dioxide in the air is that companies should make use of new emissions technology to avoid air pollution.

Learn more on air pollution here,

https://brainly.com/question/10004402

Many policies are established to control air pollution like Tradable Permit System, Corrective Tax, Command-and-Control Policy, and Corrective Subsidy.

A corrective subsidy is a policy that encourages people to plant trees. Command-and-Control Policy or the regulation policy limits the emission of the particles that affect and harms the air and mandates the use of emissions-reducing technology.

Corrective Tax policy discourages negative effect behavior and imposes Pigovian tax that helps in achieving optimal pollutants. Tradable Permit System allows the figuring of the individual pollution emission.

Therefore, public policies are aimed to reduce air pollution through various means.

Learn more about air pollution here:

https://brainly.com/question/14275614

#SPJ4

Answer:

The independent variable is the calculator

The dependent variable is the speed of solving the problem.

The constant variable is the same set of problems that were assigned to two groups of students.  

The dependent variable is the one that is being tested by experimentation. The dependent variable depends on the independent variable.  

The independent variable can b changed by the experimenter whereas the constant variable remains unchanged throughout the experiment.  

Answer:

Controlled Variable: The same math problems

Dependent Variable: The amount of time taken to answer

Independent Variable: One group using calculators and the other group not using calculators.

Explanation:

The dependent variable is the variable being tested and the independent variable is what is being changed. The controlled is what is staying the same.

Answer:

[tex]\huge\boxed{\sf v = 0.017 \ L}[/tex]

Explanation:

Given Data:

Mass = m = 0.08 g

Molar mass of C₂H₂F₄ = (12×2) + (1×2) + (19×4)

= 24 + 2 + 76 = 102 g/mol

Pressure = P = 1.14 atm

Temperature = T = 19.1 °C + 273 = 292.1 K

Gas Constant = R = 0.08206 L atm K⁻¹ mol⁻¹

Required:

Volume = v = ?

Formula:

Pv = nRT

Solution:

Firstly, finding moles (n)

[tex]\displaystyle n = \frac{mass}{molar \ mass} \\\\n = \frac{0.08 }{102} \\\\n =0.0008 \ mol[/tex]

Now, Finding volume (v)

Rearranging formula

[tex]\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(0.0008)(0.08206)(292.1)}{1.14} \\\\v = \frac{0.019}{1.14} \\\\v = 0.017 \ L\\\\\rule[225]{225}{2}[/tex]

Answer:

Because X-rays have wavelengths similar to the size of atoms

X rays are used to probe the crystal structure of a material because this have same wavelength as atoms of crystal have.

X rays are the type of electromagnetic radiations and it is produced when the fast moving electron collide with the target anode and sudden deceleration takes place.

X rays have the high energy so that it easily penetrate in any crystal molecule as they also have same wavelength as atoms of the crystals have.

Hence due to high energy and same wavelength was of atoms of crystal it is used to probe the crystal.

To know more about x rays, visit the below link:

https://brainly.com/question/11305216

#SPJ4

Answer:

determiner is a word that introduces a noun or provides information about the quantity of a noun.

Explanation:

The metal cans are recyclable. (determiner before the adjective describing a plural noun to specify which cans)

Metal cans are recyclable. (no determiner because it's optional for plural nouns and noun phrases)

Answer:

1.4 moles/ 2.0 L= 0.7 M

Explanation: Molarity= moles of solute/ Liters of solution

therefore just plug the numbers in and you'll find the molarity to equal. 0.7

The plants which have a fibrous root system are

A fibrous root system is a root system which consists of large mass of roots of nearly equal size

Some few examples of plants with fibrous roots system are as follows:

In conclusion; the plants which have a fibrous root system are grasses and corns.

Learn more about fibrous root system:

https://brainly.com/question/1600214

Answer:

I have no clue this qestion is kinda stumping but it a really good question it got me thinking but i don't know if there is a right answer

Explanation:

I don't know

No

Answer:

Morphine contains total 40 atom(s); 19 Hydrogen atom(s), 17 Carbon atom(s), 1 Nitrogen atom(s) and 3 Oxygen atom(s).

Explanation:

Answer:

Meteorites are consensually considered to be involved in the origin of life on this Planet for several functions and at different levels: (i) as providers of impact energy during their passage through the atmosphere; (ii) as agents of geodynamics, intended both as starters of the Earth’s tectonics and as activators of local hydrothermal systems upon their fall; (iii) as sources of organic materials, at varying levels of limited complexity; and (iv) as catalysts.

Explanation:

The hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.

The hydrogen ion concentration of a solution can be calculated as follows:

pOH = - log [OH-]

pOH = - log [6.3 × 10-⁷M]

pOH = - [-6.2]

pOH = 6.2

Since pOH + pH = 14

pH = 14 - 6.2

pH = 7.8

pH = - log [H3O+]

7.8 = - log [H3O+]

[H3O+] = 10-⁷:⁸

[H3O+] = 1.5 × 10-⁸M

Therefore, the hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.

Learn more about hydrogen ion concentration at: https://brainly.com/question/15082545

Answer:

please give a photo I can't now to help u

Answer:

they have a crystalline structure is the correct answer <3

Explanation:

For a liter of a buffer that is 1. 5 m in acetic acid and 0. 70 m in sodium acetate, and with a  result in a buffer pH of 4.01, the moles of HCl required is mathematically given as x=0.313mol

Generally, the equation for the pH   is mathematically given as

pH=pKa+logsalt/acid

Generally, the equation for the Chemical Reaction   is mathematically given as

HCl+CH3CooNa---->NaCl+CH3OOH

Therefore

4.01=4.74+log\frac{0.8-x}{1.3+x}

-0.52=log\frac{0.8-x}{1.3+x}

x=0.313mol

In conclusion, The moles of HCl required is

x=0.313mol

Read more about Chemical Reaction

https://brainly.com/question/6876669

Buffer is a solution that prevents pH variation in a solution when base or acid is added. In a liter of buffer 0.313 mol of hydrochloric acid must be added.

pH is the potential of hydrogen and is given as,

[tex]\rm pH =\rm pKa + log \dfrac{salt}{acid}[/tex]

The chemical reaction is given as,

[tex]\rm HCl+CH_{3}COONa \rightarrow NaCl+CH_{3}OOH[/tex]

Given,

pH =4.01

pKa = 4.74

Concentration of salt = 0.8 - x

Concentration of acid = 1.3 + x

Substituting values in the pH formula:

[tex]\begin{aligned} 4.01 &= 4.74 + \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\-0.52 &= \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\&= 0.313 \;\rm mol\end{aligned}[/tex]

Therefore, 0.313 moles of HCl are needed.

Learn more about buffers here:

https://brainly.com/question/9875355

#SPJ4

Answer:

the compound that has the smallest ions with the greatest charge

The compound that has the smallest ions with the greatest charge will have the strongest ionic bonds. Therefore, option C is correct.

Ionic compounds can be defined as solids formed by closely packed ions of opposite charge. An Ionic compound is commonly formed when metal combines with non-metal.

In ionic compounds, the ions are held together by ionic bonds. The ions are created by accepting or losing electrons in order to get their nearest noble gas configuration. In a reaction, the metals have a tendency to lose electrons to complete their octet while non-metals will gain electrons to fill their octet.

An ionic bond or electrovalent bond is a type of linkage generated from the electrostatic attraction between oppositely charged ions. Such a bond produces when the valence electrons of one atom are transferred permanently to another.

The more the charge on the ions and the smaller the ions stronger the ionic bond will be formed.

Learn more about ionic compounds, here:

brainly.com/question/17217225

#SPJ2

Answer:

D

Explanation:

If the deer leave the forest then they are avoiding compotation

Answer:

Velocity

Explanation:

The rate of change of displacement is velocity.

Answer:

Velocity

Explanation:

The rate of change of displacement with time is called velocity.

PLEASE MARK ME AS BRAINLIEST AND HAVE A NICE DAY :)

Answer:

When Chinese researchers first edited the genes of a human embryo in a lab dish in 2015, it sparked global outcry and pleas from scientists not to make a baby using the technology, at least for the present.

When Chinese researchers first edited the genes of a human embryo in a lab dish in 2015, it sparked global outcry and pleas from scientists not to make a baby using the technology, at least for the present.It was the invention of a powerful gene-editing tool, CRISPR, which is cheap and easy to deploy, that made the birth of humans genetically modified in an in vitro fertilization (IVF) center a theoretical possibility

Explanation:

Now, it appears it may already be happening.

According to Chinese medical documents posted online this month (here and here), a team at the Southern University of Science and Technology, in Shenzhen, has been recruiting couples in an effort to create the first gene-edited babies. They planned to eliminate a gene called CCR5 in hopes of rendering the offspring resistant to HIV, smallpox, and cholera.

Answer:

6 moles of oxygen is required to burn 1 mole of C4H8 completely

Explanation:

reaction is C4H8 + (6)O2 ------ (4)CO2+ (4)H2O

Answer:

Amphiprotic

Explanation:

Answer:  [tex]3.45*10^{-7}[/tex]

Explanation:

we can use the equation Ka * Kb = Kw

Kw is the equilibrium constant and always equals to [tex]1*10^{-14}[/tex]

we plug the given numbers into the equation, [tex]Ka * (2.9*10^{-8} )=(1*10^{-14} )[/tex]

now we just solve for Ka, [tex]Ka=\frac{1*10^{-14} }{2.9*10^{-8} }[/tex]

which gives us the value, [tex]Ka=3.45*10^{-7}[/tex]

hope this helped! ♡

The ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.

Ka value is the equilibrium constant found by the dissociation of acid.

By the equation

[tex]\rm ka \times kb = kw[/tex]

where kb = [tex]2.9 \times 10^-^8[/tex]

kw = [tex]1 \times 10^-^4[/tex]

Now, putting the values in the equation

[tex]1 \times 10^-^1^4 = ka \times 2.9 \times 10^-^8\\\\ka = \dfrac{1 \times 10^-^1^4}{2.9 \times 10^-^8} \\\\ka = 3.45 \times 10^-^7[/tex]

Thus, the ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.

Learn more about ka values

https://brainly.com/question/2796803

#SPJ4

Based on the data given, the energy required to remove an electron from a hydrogen atom in the n = 11 state is -0.112 eV

Ionization energy is the energy requiredto remove an electron from a neutral atom or a cation in its gaseous state.

To calculate the energy required to remove the electron from a hydrogen atom in the n = 11 state, the formula below is used:

where

[tex]E_0 \: is \: ground \: state \: energy \: of \: hydrogen \: atom \: = -13.6 eV \\ [/tex]

substituting the values:

[tex]E_n = \frac{ - 13.6 × 1^{2}}{11^{2}} \: = - 0.112 \: eV[/tex]

Therefore, the energy required to remove an electron from a hydrogen atom in the n = 11 state is -0.112 eV

Learn more about ionization energy at: https://brainly.com/question/1445179

Answer:

joules per gram per degree (J/goC) or calories per gram per degree (cal/goC).

Explanation:

Answer:

Joules, Kelvin, or calories

Explanation:

Answer: I learned that almost every technology has radio waves that spread out from their sources.

Explanation:

Answer:

I won't say I'm confident with this because I'm not sure if the second one is even correct, but I hope I helped you and didn't make things worse lol.

It gets basic

ie ph>7 for basic solutions

Answer:

[tex]\huge\boxed{\sf n = 7.36 \ mol}[/tex]

Explanation:

Given Data:

Volume = v = 42.19 L

Pressure = P = 428.792 kPa = 4.23 atm

Temperature = 27.871 °C + 273 = 300.871 K

R = the gas constant = 0.08206 L atm K⁻¹mol⁻¹

Required:

No. of moles = n = ?

Formula:

nRT = Pv

Solution:

Rearranging formula

[tex]\displaystyle n = \frac{Pv}{RT} \\\\n = \frac{(4.23)(42.19)}{(0.08206)(300.871)} \\\\n = \frac{181.467}{24.69} \\\\n = 7.36 \ mol\\\\\rule[225]{225}{2}[/tex]

B is your answer

If the ignition temperature of a fuel is lower than the room temperature, then it can catch fire very easily.

Therefore for an ideal fuel, the ignition temperature should be higher than the room temperature.

let's observe one by one

#1

If ignition temperature is below room temperature the fuel can catch fire at once.

#2

Ignition temperature above room temperature is applicable as the fuel won't catch fire easily

#3

It's boiling point of water not fuels

#4

Equal to room temperature is same as first one can cause damage