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Answer:

6

Explanation:

there are 2 sodium atoms, 1 carbon atom and 3 oxygen atoms

2+1+3=6 atoms

Answer:

seems like you got the answer already sooooooooooooooooooo

Explanation:

<3

Have a pic of Chenle dont hate

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

From the question we have

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{25 \times 30}{55} = \frac{750}{55} \\ = 13.636363...[/tex]

We have the final answer as

Hope this helps you

Answer:I believe it’s because of the volcanos making up the ring

Explanation:

Answer:

P= 7.01 atm

P(CO₂)= 2.34 atm

Explanation:

Step 1: Convert the temperature to Kelvin

We will use the following expression.

K = °C + 273.15

K = 32.0°C + 273.15 = 305.2 K

Step 2: Calculate the total number of moles of the mixture

We will use the following expression.

n = nCO₂ + nN₂ = 2.33 mol + 4.66 mol = 6.99 mol

Step 3: Calculate the total pressure of the mixture

We will use the ideal gas equation.

P × V = n × R × T

P = n × R × T / V

P = 6.99 mol × 0.0821 atm.L/mol.K × 305.2 K / 25.0 L

P= 7.01 atm

Step 4: Calculate the partial pressure of carbon dioxide

We will use the ideal gas equation.

P(CO₂) × V = nCO₂ × R × T

P(CO₂) = nCO₂ × R × T / V

P(CO₂) = 2.33 mol × 0.0821 atm.L/mol.K × 305.2 K / 25.0 L

P(CO₂)= 2.34 atm

Answer:

32.9%

Explanation:

The mass of water present in the original sample can be calculated by the substraction:

The percent by mass of water can be calculated with the formula:

Answer:

I think it's green or blue...

Answer:

0.140 Liter

Explanation:

M1V1 = M2V2

M1 = 1.61 M

V1 = 87 ml

M2 = 1.00 M

V2 = ?

V2 = M1V1/M2

V2 = 1.61×87/1

V2 = 140.07 ml

V2= 0.140 L

Answer:

A =8

B =8

C = O oxygen

D =26

E =30

F = Fe iron

Explanation:

No of protons = atomic number

No of protons + number of neutrons = atomic mass

Answer:

Using the periodic table, complete the table to describe each atom. Type in your answers.

A     ⇒ 20

B     ⇒ 40

C      ⇒ Ca

D     ⇒ 10

E      ⇒ 9

F      ⇒ F

Explanation:

yes

Answer:

Explanation:

Formula of percent composition:

% X = ( mass of element in compound / total mass of compound ) × 100

11) Al₂O₃

Al = 27 g/mol

O = 16 g/mol

%Al = (54 / 101.96) × 100

%Al = 52.9%

%O = (48 / 101.96) × 100

%O = 47.1%

12) C₅H₅O₅

C = 12 g/mol

H = 1 g/mol

O = 16 g/mol

C% = (60 / 145 ) × 100

C% =41.4%

H% = (5 / 145 ) × 100

H% =3.4%

O% = (80 / 145 ) × 100

O% = 55.2%

13) BaBr₂

Ba = 137.3 g/mol

Br =79.9 g/mol

Ba% = (137.3 / 297.14) × 100

Ba% = 46.2%

Br% = (159.8/ 297.14) × 100

Br% = 53.8%

14) Fe₃(PO₃)₂

Fe = 55.8 g/mol

P = 31 g/mol

O = 16 g/mol

Fe = (167.4/325.48)  × 100

Fe = 51.43%

P = (62/325.48)  × 100

P = 19.05%

O = (96 /325.48)  × 100

O = 29.49%

Answer:

) B

Explanation:

Answer:

ΔE =  -22 KJ

Explanation:

Given data:

Work done = 13 KJ

Heat lose = 9 KJ (exothermic process)

ΔE = ?

Solution:

Formula:

ΔE = q + w

ΔE = - 9KJ + (-13 KJ)   (work is done by the system on surrounding that's why we add negative sign)

ΔE =  -22 KJ

Answer:

LED bulbs fit standard light sockets and are the most energy-efficient option. LEDs have lower wattage than incandescent bulbs but emit the same light output. This allows them to produce the same amount of light but use less energy. LEDs can last over 20 years and don't contain mercury

Answer:

(A) and (D)is the correct answer

Explanation:

(A) in terms of electronic concept and (D) in terms of classical concept

coz you know

hope, it helps.......

Answer:

A. It gives up electrons

Explanation:

on PLATO

I got 5 out of 5 on quiz

The coefficient of Oxygen in the balanced reaction : 3

Given

Reaction(unbalanced)

C2H4+ O2--> CO2+H2O​

Required

The coefficient of Oxygen

Solution

C₂H₄+ aO₂⇒ bCO₂+cH₂O​

C, left=2, right=b⇒b=2

H, left=4, right=2c⇒2c=4⇒c=2

O, left=2a, right=2b+c⇒2a=2b+c⇒2a=2.2+2⇒2a=6⇒a=3

The equation becomes :

C₂H₄+ 3O₂⇒ 2CO₂+2H₂O​

Answer:

The sun

Explanation:

I did it and got it correct :-)

Answer:

Mass = 0.37 g

Explanation:

Given data:

Number of moles of sulfur = 11.9 mol

Mass of sulfur in 11.9 mol = ?

Molar mass of sulfur = 32.06 g

Solution:

Number of moles = mass/molar mass

by putting values,

11.9 mol = mass/ 32.06 g/mol

Mass = 11.9 mol × 32.06 g/mol

Mass = 0.37 g

Answer:

V₂ =  7546  L

Explanation:

Given data:

Initial volume = 49.0 L

Initial pressure = 154 atm

Final pressure = 1 atm

Final volume = ?

Solution:

The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

154 atm × 49.0 L = 1.00 atm × V₂

V₂ = 7546 atm. L/1 atm

V₂ =  7546  L

Answer:

mass = 6.9 kg = 6900 g

volune= 722 cm3

density= mass/volume

density= 6900/722

= 9.55 g/ cm3

Answer:

[tex]\boxed {\boxed {\sf d \approx 9.56 \ g/cm^3}}[/tex]

Explanation:

We want to find the density of the plastic in grams per cubic centimeter.

Density is found by dividing the mass by the volume.

[tex]d=\frac {m}{v}[/tex]

We know the mass is 6.9 kilograms and the volume is 722 cubic centimeters We must convert kilograms to grams.

Now we know the mass and volume. Substitute the values into the density formula.  

[tex]d=\frac{ 6900 \ g }{722 \ cm^3}[/tex]

[tex]d= 9.5567867 \ g/cm^3[/tex]

Let's round to the nearest hundredth. The 6 in the thousandth place tells us to round the 5 to a 6.

[tex]d \approx 9.56 \ g/cm^3[/tex]

The density of the plastic is about 9.56 grams per cubic centimeter

Explanation:

Vanadium is in Period 4 and in the d-block of elements. The highest energy subshell is 4s. (because as electrons fill the 3d subshell, the subshell becomes of lower energy than 4s)

We have 1s²2s²2p⁶3s²3p⁶3d³4s².

Answer:

Vanadium (V) --- d-block element

Location on the periodic table :

Atomic number=23

Atomic mass=51 g/mol

The correct electron configuration for Vanadium is:

V= [Ar]4s²3d³ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³

3. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³ is the right answer.

Answer:

Cs > Rb > K > Li

Explanation:

Given elements:

             Li,  Cs , K and Rb

Arrange in the the order of decreasing atomic radius:

Atomic radius is taken as half of the inter-nuclear distance (d) between two covalently bonded atoms of non - metallic elements or half of the distance between two nuclei in the solid state of metals.

So, the given species are the same group on the periodic table. These are group 1 elements;

          Li,  Cs , K and Rb

                   Cs > Rb > K > Li

Answer:

29.26 gram

Explanation:

No of molecules = no of mole × Avogadro's number

No of molecules = mass in gram/ molar mass × Avogadros number

Mass in gram =No of molecules×molar mass / Avogadros number

Mass in gram = 3.012 ×10^23 × 58.5/6.02×10^23

29.26 gram

Answer:

2nd one

Explanation:

Answer:

is it c

Explanation:

Answer:

100 POINTS! (50 split up) PLSSSSSSSSSS HELP!!! I REALLY NEED IT SO MUCH :( I PROMICE TO GIVE BRAINLIEST AND FIVE STARS AND A THANKS! 6TH GRADE SCIENCE! i used all my points for this!

You measure the mass of an apple using a balance. You get these three measurements:

Trial 1: 167.0 g

Trial 2: 166.9 g

Trial 3: 167.2 g

You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer in a paragraph for the best grade.

Explanation:

Answer:

copper

Explanation:

i think it's copper because it's cheep and It exists in abundance

Answer:

B. 1 +8 > 2 + 4

Explanation:

Hello!

In this case, since inequalities show how a number is different, greater or less than, to an other, considering the given options, just B. 1 +8 > 2 + 4  is an inequality because if we solve the operation we obtain:

9 > 6

Which means that nine is greater than 6.

Best regards!

Answer:

d.Na

...................

Answer:

dependent

controlled

controlled

independent

independent

controlled

dependent

controlled

dependent

dependent

Explanation:

I HOPE IT HELPS :)

Answer:

C) 3

Explanation:

Given data;

Number of moles of oxygen produced = ?

Moles of KClO₃ decomposed = 2 mol

Solution:

Chemical equation;

2KClO₃      →      2KCl + 3O₂

Now we will compare the moles of KClO₃  with  O₂

                        KClO₃           :           O₂

                           2                :            3

Thus, 3 moles of oxygen are produced.