What is the temperature of 0. 750 mol of a gas stored in a 6,850 ml cylinder at 2. 21 atm?.

Answer:

0.15 l of 4.0 m stock KCl solution should betaken

Explanation:

N1V1=N2V2

6*0.1=V2*4

V2=0.15L

Answer:

187 L

Explanation:

its the correct answer on smartsparrow.

Answer:

b

Explanation:

Answer:

B, C and D

Explanation:

Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.

Although fossil fuels are continually formed by natural processes, they are classified as non-renewable resources because they take millions of years to form.

fossil fuels, are called nonrenewable, which means they have a limited supply and are not continuously being made or they are made very slowly

Answer:

MAC: Assembly of the MAC leads to pores that disrupt the cell membrane of target cells, leading to cell lysis and death

Interferons: Stimulates the infected cells and those nearby to produce proteins that prevent the virus from replicating within them

Cytokines: Molecular messengers between cells

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Answer:

The low molecular weight of water makes water a favorable liquid for steaming

Answer:

Give evidence for the existence of a magnetic field near a current carrying wire. If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected.

Answer:

A pearl is not a mineral

Explanation:

Even though a pearl is made up of a few little overlapping platelets of certain minerals such as aragonite, which is the stable form of calcium carbonate which is a necessary component for sealife. Why is a pearl not a mineral though? Yes a pearl is made up of mineral compounds, but its organic origins take away its ability to be included as a mineral. Pearls do not have distinctive crystal structures and are formed by living organisms.

Answer:

180 g NaOH

Explanation:

Step #1 : Use the molarity equation to find moles. The volume is needed in liters, so convert the milliliters to liters.

Molarity (M) = moles (mol) / liters (L) ---->

Molarity (M) x liters (L) = moles (mol)

750 mL NaOH              1    L
                          x    ----------------   =    0.75 L NaOH
                                 1,000   mL

(6 M NaOH) x (0.75 L NaOH) = ? mol

                                                = 4.5 mol NaOH

Step #2 : Find the mass using the moles and the molar mass of the solution. The molar mass can be calculated using the values of the elements on the periodic table.

Molar Mass (g/mol) = grams (g) / moles (mol) --->

Molar Mass (g/mol) x moles (mol) = grams (g)

? g/mol = (22.99 g/mol Na) + (15.999 g/mol O) + (1.008 g/mol H)

? g/mol = 39.997 g/mol NaOH

(39.997 g/mol NaOH) x (4.5 mol NaOH) = ? g

                                                                  = 179.99 g NaOH

                                                                  = 180 g NaOH (2 sig figs)

                                                                  = 200 g NaOH (1 sig fig)

Explanation:

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[tex]\\ \rm\Rrightarrow 2AlCl_3+3F_2\longrightarrow 2AlF_3+3Cl_2[/tex]

3mols of fluorine produce 2 mol chlorine

1 mol fluorine produces 2/3=0.6mol chlorine

Moles of fluorine gas=

Moles of chlorine:-

Mass of chlorine

If the concentration of the solutions are doubled then the cell EMF is also doubled.

According to the Nernst equation, the concentration of the species determines the cell EMF as we can see form the formula;

Ecell = E°cell - 0.0592/nlogQ.

Hence, if the concentration of the solutions are doubled then the cell EMF is also doubled.

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The mass of oxygen reacted/required in this reaction is obtained as 48g.

The term stoichiometry has to do with mass- volume or mass - mole relationship which ultimately depends on the balanced reaction equation.

Now, we have the reaction; S + O2 ------>SO2

If 1 mole of sulfur dioxide contains 22.4 L

x moles of sulfur dioxide contains 33.6L

x = 1.5 moles of sulfur dioxide.

Since the reaction is 1:1, the number if moles of oxygen required/reacted is 1.5 moles.

Mass of oxygen required/reacted = 1.5 moles * 32 g/mol = 48g

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Geraldo can add a pollutant with slightly basic nature so he will have a solution of neutral pH of 7.

The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution.

The pH of 6.5 means that the solution is acidic.

By adding a pollutant which is slightly basic in nature, Geraldo will have a solution of neutral pH which is a pH of 7.

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Answer:

1.pesticide

2.less than 6.65

Explanation:

Answer:

lead (II) chlorate

Explanation:

precipitate means not soluble in water

potassium chlorate is not very soluble in water, it precipitates and may be collected by filtration

lead(II) chloride can be made as a white precipitate by adding a solution containing chloride ions to lead(II) nitrate solution

thoughtcocom chemguidecouk

The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later, then the half life time is 365 hours.

Half life time for the first order reaction will be calculated by uisng the below equation as:

k = 0.693/t, where

t = half life time

k is the rate constant and its value will be calculatedy using the below equation as:

ln(No/N) = kT, where

No = initial concentration of radioisotope = 3000

N = remaining contentration of radioisotope = 2736

T = time require for above change = 48 hours

On putting these values on above equation, we get

k = ln(3000/2736) / 48 = 0.0019

Now putting this value in the first equation, we get

t = 0.693/0.0019 = 364.7 = 365 hours

Hence half life time is 365 hours.

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Answer: 0.813 L

Explanation:

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of helium gas is 5.63 atm.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of  radon gas

V= volume of  radon gas

n =number of moles of  radon gas

T =temperature of radon gas

R = Gas constant = 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

{ (1.15 atm) (1.53 L)} ÷305  K ={ (P2) ( 1.78)} ÷325 K

P2 = 7.55÷1.34 = 5.63 atm

Therefore the new pressure of radon gas is 5.63 atm when the temperature is changed to 325K and volume is decreased to 1.78liter.

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941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.

Electrolysis is the process by which electric current is passed through a substance to effect a chemical change.

The mass of aluminium oxide Al₂O₃ = 2000 kg = 2000 000 g

Molar mass of Al₂O₃ = 101.96 g/mol

no of moles = [tex]\frac{mass }{ molar \;mass}[/tex]

no of moles of Al₂O₃ =  [tex]\frac{2000 000 g}{101.96 g/mol}[/tex]

no of moles of Al₂O₃ = 19615.4 mol

From the reaction:

4Al + 3O₂  ⇒  Al₂O₃

To determine the moles of O₂ in Al₂O₃:

Then;

19615.4 mol X [tex]\frac{3}{2}[/tex] mol of O₂ = 29423.1

The mass of oxygen now = 29423.1  × 32 g

= 941539.2 g

Hence,  941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.

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Answer:

Original: P₁ = 710 mmHg, V₁ = 14.8 mL, T₁ = (273.2 + 11.0) K = 284.2 K

New: P₂ = 370 mmHg, V₂ = ? mL, T₂ = (273.2 + 20.0) K = 293.2 K

Combined gas law: P₁V₁/T₁ = P₂V₂/T₂

Then, V₂ = V₁ × (P₁/P₂) × (T₂/T₁)

Calculated new volume, V₂ = (14.8 mL) × (710/370) × (293.2/284.2) = 29.3 mL

Answer:

7.2 x 10^23

Explanation:

Currently in Chemistry class

Answer:

S

Explanation:

Answer:

We used coal for electricity, water for steam engines when we used them, natural fossil fuels for gasoline and oil and we use earths oxygen/nitrogen gases to breathe

Explanation:

Hope this helps:)....if not then sorry for wasting your time and may God bless you:)

Answer:

If liquid bromine is cooled to form a solid, which type of solid does it form? Brass is made by melting copper and zinc and physically mixing them. As this alloy is cooled, it forms a solid where the copper and zinc are not chemically bonded together.

Explanation:

Let's see

Option D

Empirical Formula StepsN2O6Sr Strontium Nitrate

Explanation:

Answer:

that make 11 isomers....

Answer:

A comet

Explanation:

Comets  travel so fats through the solar system that they melt which give them their glowy tail

Which of these solutions is the most basic?

[OH-] = 4.3 x 10-9 M

[OH-] = 2.8 x 10-11 M

[OH-] = 6.7 x 10-10 M

[OH-] = 1.0 x 10-5 M

[OH-] = 4.3 x 10-9 M

_______________________________________

[OH-] = 2.8 x 10-11 M

_______________________________________

[OH-] = 6.7 x 10-10 M

_______________________________________

[OH-] = 1.0 x 10-5 M

_______________________________________

we know that , the solution with pH > 7 is termed as basic and more the pH ,more the basicity, hence ,the solution with the highest pH would be the strongest base out of these all which is

[OH-] = 1.0 x 10-5 M with pH = 9

_______________________________________

Note the rule

And we can find the answer through logarithm rules basic

So

Higher the n higher the pOH

But

As we can see

Option D has least n (5)

Hence D is more basic