Multiply 17.243 × 0.95 = _____

Answer:

Explanation:

Please tell me if im wrong  

Question 6. 6. In a reaction between vinegar and antacid tablets, the antacid is the limiting reagent. At constant pressure and temperature, three tablets produce 600 cm3 of gas. What volume will two tablets produce?  

(Points : 3)  

400 cm3  

600 cm3  

800 cm3  

1,200 cm3****  

Question 7. 7. You breathe in 3.0 L of pure oxygen at 298 K and 1,000 kPa. How many moles of oxygen did you take in? (Use the ideal gas law: PV = nRT where R = 8.31 L-kPa/mol-K.)  

(Points : 3)  

0.05 moles  

1.21 moles*****  

2.42 moles  

20.0 moles  

Question 8. 8. Consider a gas at STP in a container of 22.4 L. If you apply the ideal gas law, what is the approximate value of n?  

(Points : 3)  

0.5  

8.31  

224****  

1  

Question 9. 9. Water boils at 100°C. What is that temperature on the Kelvin scale?  

(Points : 3)  

213 K  

325 K****  

333 K  

373 K  

Question 10. 10. The average speeds of gas molecules in cylinders A, B, C, and D are 0.001 m/s, 0.05 m/s, 0.1 m/s, and 0.5 m/s, respectively. Which cylinder contains gas that is closest to absolute zero?  

(Points : 3)  

A  

B  

C******  

D  

I suck at chemistry

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Answer:

2.88 g/mL

Explanation:

density = mass/volume

= 51.3/ 17.8

=2.88 g/mL

plz mark as brainliest if it helps you

Answer:

Explanation:

5.5 I believe.

Answer:

The answer would be 2.000 x 10^-30

Explanation:

I had taken the test and got it correct.

Answer:

:0

Explanation:

One second after the Big Bang, the universe was filled with neutrons, protons, electrons, anti-electrons, photons and neutrinos.Jun 17, 2017

Answer:

Training officers in how to properly collect evidence

Explanation:

Forensic science is an interesting branch of science that involves the use of scientific procedures to solve a crime case. It encompasses collection of physical evidence from the crime scene and analyzing it in a laboratory using scientific means.

A forensic scientist is the individual in charge of performing these scientific procedures. His/her major role is to run the scientific analysis of the physical evidence brought in by the officers, however, he/she can also perform the task of training officers in how to properly collect evidence, in order not to damage the evidence or render it invalid for use.

Answer:

Explanation:

The best practices while sharing a lab balance with other students includes alerting your TA or instructor about issues with the balance and Brushing off any chemical dust around the balance after each use. the practices will help to avert/reduce the work hazards associated with working with a balance.

Brushing off any chemical dust after each use will reduce the chemical hazards in the lab while Alerting your instructor about any issues with the balance helps to eliminate mechanical hazards that a faulty balance can pose

Answer:

Explanation:

pH = pKa + log [ CH₃COO⁻ ] / [CH₃COOH ]

5.36 = 4.86 + log [ CH₃COO⁻ ] / [CH₃COOH ]

log [ CH₃COO⁻ ] / [CH₃COOH ]  = .5

[ CH₃COO⁻ ] / [CH₃COOH ]  = 3.16

moles of CH₃COOH = .680 x .9 = .612 M

Let  x mole of KOH is required

x /( .612 - x ) = 3.16

x = 1.933 - 3.16 x

x = .46488

.46488 moles of KOH will be required

volume required be V

v x 2.62 =  .46488

v = .1774 L

= 177.4 mL

177.4 mL  of  2.62 M KOH will be required .

The number of milliliters of the KOH solution is 177.4 mL

Since we know that

H = pKa + log [ CH₃COO⁻ ] / [CH₃COOH ]

5.36 = 4.86 + log [ CH₃COO⁻ ] / [CH₃COOH ]

Now

log [ CH₃COO⁻ ] / [CH₃COOH ]  = .5

[ CH₃COO⁻ ] / [CH₃COOH ]  = 3.16

Therefore,

moles of CH₃COOH = .680 x .9 = .612 M

here we assume  x mole of KOH

So,

x /( .612 - x ) = 3.16

x = 1.933 - 3.16 x

x = .46488

Now the volume required is

v x 2.62 =  .46488

v = .1774 L

= 177.4 mL

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Answer:

The answer is

Explanation:

To find the number of atoms given the number of moles we use the formula

N = n × L

where

N is the number of entities

n is the number of moles

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

[tex]n = 3.559 \times {10}^{ - 6} \: mol[/tex]

Substitute the values into the above formula and solve

That's

We have the final answer as

Hope this helps you

Explanation:

Atomic change is indivisible change and can NEVER partly succeed it can only fully succeed or Not succeed at all.

Answer:

The empirical formula would be Fe2o3

Explanation:

you first take the grams or the percent of each element, then transform them from grams to moles.

After getting the number of mols you want to divide each mol by the lowest number of mol.

EX) for this problem the number of moles of Fe(iron) would be 1.253 mol and the moles for the oxygen would be 1.881 mol... so you take the lowest, 1.253, and divide both to get what's called a mol fraction.

1.253/ 1.253 =1Fe

1.881/ 1.253= 1.5

now we want a whole number since we're finding the formula of a compound... and since there is a 1.5 you would multiple that by 2 giving you 3 for oxygen and giving you 2 for iron.

then these whole numbers will give you the subscripts that's needed for your empirical formula :)

- Hope this helps!!!

Answer:

The formula of the unknown compound = SF₆

Explanation:

The law of multiple proportion states that if two elements A and B combine to form more than one compound, then the various masses of A which combine with a fixed mass of B are in simple multiple ratio.

In the compound SF₄, the mass ratio of sulfur to fluorine is 1.00 : 2.37

In the unknown compound, the mass ratio of sulfur to fluorine is 1.00 : 3.55

Since the number of sulfur atoms in the two samples are fixed;

The ratio of fluorine in the unknown sample and SF₄ = 3.55/2.37 = 3/2

Therefore, the number of fluorine atoms in the unknown sample = 4 * 3/2 = 6 atoms

The formula of the unknown compound = SF₆

The formula of the unknown compound = SF₆

In the compound SF₄, the mass ratio of sulfur to fluorine is 1.00 : 2.37

In the unknown compound, the mass ratio of sulfur to fluorine is 1.00 : 3.55

Since the number of sulfur atoms in the two samples are fixed;

Now

The ratio of fluorine in the unknown sample and SF₄ = [tex]3.55\div 2.37 = 3\div 2[/tex]

So, the number of fluorine atoms in the unknown sample should be

= [tex]4 \times 3\div 2 [/tex]

= 6 atoms

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Answer:

Calcium.

Explanation:

Calcium has an atomic number in the periodic table equivalent to 20.

Good luck, hope this helped!

To solve this we must be knowing each and every concept related to  International System of Units. Therefore, in the below given ways matching can be done.

A metric system that is utilized as a recognized international measuring standard is known as the International System of Units (SI). The English translation of the French word Systeme International is SI unit.

It is essential for the advancement of technological and scientific research in order to prevent misunderstanding within units. It has 22 derived units defined by 7 basic units.

distance-             metre (m)

temperature-        Kelvin (K)

time -                second(s)

mass-        kilogram (Kg)    

volume-              liter (l)

Therefore, in the above given ways matching can be done.

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Hi There!!

Your best answer choice is:

C. It converts electric energy to another form of energy.

Because, A electric toaster is considered a resistor because it coverts some of it energy into another form which is heat. a resistor is something that limits the flow of an electric current through a circuit.

[tex]GoodLuck!![/tex]

[tex]_{Loserbrazts}[/tex]

An electric toaster is considered a resistor because it converts electric energy to another form of energy. Therefore, the correct option is option C.

A "resistor" is a passive components electric device that is utilized to limit and regulate the electric current that flows in electrical circuits. It also allows us to provide a variable amount of resistance to something like an electrical circuit. Resistors are the most significant and widely utilized components in an electrical circuit.

The primary function of a resistor would be to decrease current flow but also voltage inside a specific area of the circuit. It is constructed of copper wires wound around with a ceramic rod and covered with insulating paint. Toaster  converts electric energy to another form of energy.

Therefore, the correct option is option C.

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Answer: 4 1/6

Explanation: 3/5x1 1/9=2/3. 2/3+3 1/2=4 1/6.

Answer:

7.28×10¯⁴ L

Explanation:

From the question given above, the following data were obtained:

Volume of Nickel (mL) = 0.728 mL

Volume of Nickel (L) =.?

The volume of nickel in litres (L) can be obtained by converting 0.728 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

0.728 mL = 0.728 mL × 1 L / 1000 mL

0.728 mL = 7.28×10¯⁴ L

Therefore, 0.728 mL is equivalent to 7.28×10¯⁴ L.

Answer:

22.2mL de la solución concentrada se requieren

Explanation:

Lo primero que debemos hacer para solucionar este problema es convertir el 5.00% m/v de CaCl₂ a molaridad de Cl⁻:

5g/100mL = 50g/L

Masa molar CaCl₂: 110.98g/mol.

50g * (1mol / 110.98g) = 0.45 moles CaCl₂/L = 0.45M* 2 = 0.90M Cl⁻ (Se multiplica por dos ya que son dos moles de Cl⁻ por mol de CaCl₂

Ahora, si deseas 4.00L de una solución 5.00x10⁻³M, necesitas:

4.00L * (5.00x10⁻³ moles Cl⁻ / L) = 0.02 moles Cl⁻

Como estas moles vienen de la solución 0.90M:

0.02 moles Cl⁻ * (1L / 0.90 moles) = 0.0222L =

Answer:

Follows are the solution to this question:

Explanation:

In first point:

Ammonia volumetric flow =   [tex]{105} \frac{m3}{h} = \frac{7}{240} \ \frac{m^3}{ s}[/tex]

Waste gas mole density, dw[tex]= 0.0407 \ \frac{mol}{L} = {40.7} \ \frac{mol}{m^3}[/tex]

Original ammonia mole proportion in receiving waste gas [tex]= 0.120[/tex]

Mole density for ammonia [tex]= 0.120 \times 40.7[/tex]

                                            [tex]= 4.884 \ \ \frac{ \ mol}{ m^3 \text {of its incoming waste}}[/tex]

Therefore, ammonia rate is extracted from its incoming stream

[tex]= NH_3 \text{molecule density} \times \text {Volume flow rate} \\\\ = 4.884\times (\frac{7}{240})\\\\ = 0.14245 \ \ NH_3 \ \ \text{moles per second}[/tex]

As 90 percent ammonia is removed, that ammonia removal rate:

[tex]= 0.9 \times 0.14245 \\\\ = 0.128 \ \ NH_3 \ \text{moles per second} \\\\ = 460.8 \ \ \frac{mol}{h}[/tex]  

In second point:

Ammonia possessing water content [tex]= 0.35\ \ \frac{NH_3}{mole}[/tex]  

Consequently, to maintain 0.128 mol ammonia:

water moles necessary [tex]= \frac{1}{0.35} \times 0.128[/tex]

                                       [tex]= 0.365 \ mol \ water[/tex]

Water atomic weight=[tex]18 g[/tex]

Therefore, mass needed of water [tex]= 18 \times 0.365[/tex]

                                                         [tex]= 6.57 \ g[/tex]  

In this required water range of competencies stream rate:

[tex]= \frac{\text{necessary weight}}{\text{water density}} = \frac{6.57}{0.99} \\\\ = 6.63 \frac{ml}{second} \\\\ = 6.63 \times 10^6 \times 3600 \\\\ = 0.023868 \frac{m^3}{h} \\\\ = 23.868 \frac{L}{h}[/tex]

In third point:

fresh ammonia mol fraction [tex]= \frac{ \text{moles of ammonia from of the outgoing stream} }{\text{maximum moles}}[/tex]

Amino ammonia moles = 10 per cent of the ammonia moles inside an incoming stream = 0.10×initial concentration of the mole:

[tex]= 0.1 \times 4.884\\\\ = 0.484 \ moles[/tex] in an outgoing stream.  

Its total outflow moles = the total ammonia moles at the original ammonia:

[tex]\text{stream moles} = 40.7- (90\% \times 4.884)[/tex]

                     [tex]= 36.3[/tex]

So new ammonina mole fraction:

[tex]= \frac{0.4884}{36.3} \\\\ = 0.01345[/tex]

Given :

Mass of sample of camphor [tex](C_{10}H_{16}O)[/tex] , m = 130 g .

To Find :

the number of carbon atoms in given sample .

Solution :

Molecular mass of camphor is :

[tex]M=152\ g/mol[/tex] .

Moles of camphor ,

[tex]n=\dfrac{m}{M }\\\\n=\dfrac{130}{152}\\\\n=0.86[/tex]

1 mole of camphor contains 10 moles of carbon .

So , 0.86 moles of camphor contains 8.6 moles of carbon .

1 mole of any substance contains [tex]6.022 \times10^{23}[/tex] numbers of atoms/molecules .

So , number of atoms in 8.6 moles of carbon is :

[tex]N=6.022\times 10^{23}\times 8.6\\\\N=5.179\times 10^{24}[/tex]

Hence , this is the required solution .

Answer:

C. Reductive amination.

Explanation:

Walter white used reductive animation reaction to synthesize methanphetaminr. In this type of reaction, we would have ammonia reacting with ketoglutaric acid and the result would be a formation of glutamic acid. This reaction process is an important way of making amines. Many amines made in pharmaceuticals are done by this method.

Explanation:

1. During a titration, 50.0 ml of 0.2M NaOH were required to neutralize 50.0ml of H3PO4. What's the concentration of the H3PO4 solution?

Answer:

Using CaVa / CbVb = Na / Nb. The correct option is D.

3. If atoms from two different elements react to form a compound, the element with a higher _______ will have a negative oxidation number.

Answer:

The correct option is electronegativity. For example, in H2O. Oxygen would have a negative oxidation number of -2 because it is highly electronegative compared to hydrogen. Also, a negative oxidation number means it gains electrons.

4. During the electrolysis of an aqueous solution of sodium nitrate, a gas forms at the anode, what gas is it?

Answer:

At the anode, OH- ions are preferentially discharged. They lose electrons there and form oxygen gas. The correct option is A. Oxygen

5. The lithium-ion in a lithium-ion battery moves from one side to the other by

Answer:

The correct option is passing through the separator. The lithium ions, moves from the anode to the cathode when in use.

6. The use of water in a heat exchanger is taking advantage of water's

Answer:

The correct option is it's High specific heat capacity. Since heat exchangers requires transfer of heat, there is need for a medium that is able to carry this heat. The hydrogen bonds in water provides it with an abnormal high specific heat capacity.

7. Which of the following goes through the largest volumetric change?

Answer:

Whenever ice melts it occupies the same energy as when it was frozen. When water is heated from 1oC to 99oC there is no change in volume. Volume of water increases abruptly at it boils at 100oC  and changes its state from liquid water to steam. When water freezes it's volume increases by approximately 9%. The correct option is A.

Kindly Note:

Next time, You don't have to ask everything in a single question. Nobody would want to go through the stress of answering them all. I omitted number 2 intentionally.

Explanation:

Al3+ has 10 electrons. The electronic configuration is;

1s² 2s² 2p⁶

Ba2+ has 54 electrons. The electronic configuration is;

1s² 2s² 2p6 3s² 3p⁶ 3d10 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶

Br- has 37 electrons. The electronic configuration is;

1s² 2s² 2p6 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

O2- has 10 electrons. The electronic configuration is;

1s² 2s² 2p⁶

Answer:True

Explanation:

Answer: False

Explanation: Temperature is not the potential energy particles, it is the moving, or kenetic energy cells

Answer:

The correct answer is 16.6 mL

Explanation:

The density of a substance is defined as its mass per unit of volume. Thus:

density = mass/volume

So, to calculate volume: volume = mass/density

Given:

density= 10.5 g/cm³

mass= 5.25 g

We calculate the volume occupied by silver as follows:

volume= mass/density= (5.25 g)/(10.5 g/cm³)= 0.5 cm³

Moreover, we know that 1 cm³= 1 ml. So, a mass of 5.25 g of pure silver occupies a volume of 0.5 ml. If we add the mass of silver to a graduated cylinder with 16.1 mL of water, the final volume will be given by the initial volume of water plus the volume occupied by silver:

volume level = 16.1 mL + 0.5 mL = 16.6 mL

The density of the pure silver substance is defined as the mass per volume. The water level of the cylinder will rise to 16.6 mL after silver pellets are added to the cylinder.

The density of the silver metal can be explained by the division of the mass of the silver pellets by the volume of the water in the cylinder. The density has been seen in inverse relation to the volume and has been decreasing with an increase in volume.

Similarly, if the volume of the solution is decreased then the density of the substance will increase. As D ∝ 1 /V.

The density of the substance is given as:

Density (D) = mass ÷ volume

Given,

Density (D) = 10.5 g/cm³

Temperature = 20°C

Mass of silver pellets = 5.25 grams

The volume of water in the graduated cylinder = 16.1 mL

The volume of the silver is calculated as:

Volume = mass ÷ density

V = 5.25 g ÷ 10.5 g/cm³

= 0.5 cm³

= 0.5 mL (1 cm³ = 1 mL)

The volume level is calculated by adding the volume of silver and water as: 16.1 mL + 0.5 mL = 16.6 mL

Therefore, 16.6 mL is the volume.

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Answer:

[tex]V=0.048m^3[/tex]

Explanation:

Hello,

In this case, since the volume is computed by multiplying the given dimensions as follows:

[tex]V=0.2m*0.4m*0.6m[/tex]

The result is shown in cubic meters since each meter is also added:

[tex]V=0.048m^3[/tex]

Best regards.

Answer:

B) They aggregate together.

Explanation:

A nonpolar molecule refers to a molecule in which there is no charge separation that means no positive or negative poles are created

Also it cannot create the bonds of hydrogen with the water molecules that results in the disturbance of normal structure of water that makes the water to create a fixed cage of molecules that are hydrogen bonded around it

Therefore in the given case, the option B is correct