In the laboratory, a chemist generated hydrogen gas via the electrolysis of water. The chemist collected H2(g) over water and obtained 162.2 mL of gas at a pressure of 740 torr. What mass of H2 did the chemist collect?

Answer:

120 protons, 120 neutrons, 120 electrons

Explanation:

The number written next to element (americium - 240) is the mass number. The mass number consists of all the protons and neutrons within an atom of a particular element. Assuming that this atom is not an isotope (atoms of the same element with different number of neutrons), there should be an equal amount of protons and neutrons.

Therefore, if the mass number is 240, there should be 120 protons and 120 neutrons in the atom (240 / 2 = 120).

In neutral atoms, there is an equal amount of positively charged protons and negatively charged electrons. As such, if there are 120 protons, there should be 120 electrons.

The force is unbalanced and is towards right with 8 newton force.

it is beacuse upward and downward forces are cancelling each other.

To know more about  Unbalanced forces visit : https://brainly.com/question/13003361

#SPJ1

Answer:

1, I'm not sure but I hope it helps God Bless

National Association for the Advancement of Colored People  group helped Fred Korematsu defend himself in court,

Fred Toyosaburo Korematsu (January 30, 1919 – March 30, 2005) was an American civil rights activist who opposed Japanese American incarceration during WWII. Shortly after the Imperial Japanese Navy attacked Pearl Harbor, President Franklin D. Roosevelt issued Executive Order 9066, which authorised the removal of Japanese-Americans living on the West Coast from their homes and their mandatory imprisonment in incarceration camps, but Korematsu instead challenged the orders and fled.

The validity of Roosevelt's order was maintained by the United States Supreme Court in Korematsu v. United States. (1944). However, Korematsu's conviction for avoiding imprisonment was overturned in US District Court four decades later, following the emergence of fresh information questioning the necessity of internment.

To know more about Fred Korematsu , visit ;

brainly.com/question/30193003

#SPJ1

Answer:

Lead (IV) Iodide

Explanation:

The calculated value is 1177.263 Liters.

Remember that there is a distinction between a liquid cup and a dry measure cup, just as there is between ounces and gallons. Simply divide the quantity by 16 to determine the number of gallons from the quantity of (liquid) cups.

There are 128 ounces in a gallon, according to a free online liquid measurement conversion calculator. We now understand that there are eight water bottles in a gallon by dividing 128 by 16.9 and rounding up.

311 Gallons = 1177.263 Liters

To convert a gallon measurement to a liter measurement, multiply the volume by the conversion ratio. The volume in liters is equal to the gallons multiplied by 3.785412. There are 3.785 liters in a gallon and a liter is 0.264 of a gallon.

Learn more about gallon here-

https://brainly.com/question/2352839

#SPJ9

5 significant, because u have to start counting after the point

There are four significant figures in the given measurement  as there are  four non-zero numbers after the decimal.

Significant figures are used for establishment  of a number which is presented in the form of digits. These digits give a meaningful representation  to the numbers.

The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:

1)All non-zero digits are significant .

2)All zeroes which occur between non-zero digits are significant.

3)All zeroes to the left and right of  a non-zero digit are not significant.

4) All zeroes on right  of decimal are significant if a non-zero number follows them.

5)All zeroes on right side of non-zero digit are significant.

Learn more about significant figures,here:

https://brainly.com/question/14359464

#SPJ2

The statement is true because ions are mobile in the solution and the presence of uncharged particles do not affect conductivity. Option A

An electrolyte is a solution that is able to conduct electricity. We know that the electrolyte is able to conduct electricity because of the presence of ions in the solution. These ions are mobile charges that move in between the electrodes and make the movement of electricity possible.

If we introduce uncharged particles into this solution, they do not in anyway affect the charged particles from the electrolyte. Hence, the statement is true because ions are mobile in the solution and the presence of uncharged particles do not affect conductivity. Option A

Learn more about electrolyte:https://brainly.com/question/13631759

#SPJ1

(A) The volume of Carbon tetrachloride is 96.2 ml

(B) The density of Solid object is 3.89 g/mL

(C) The mass of water in grams is 425 gram

(A)

Molar mass of Carbon tetrachloride is 153g/mol

Density is given as 1.59g/ml

Density = mass/volume

1.59 = 153/volume

volume = 153/1.59 = 96.2 ml

Hence, volume of Carbon tetrachloride is 96.2 ml

(B)

The experiment applies Archimedes' principle, according to which the volume of a liquid that an object displaces is equal to the volume of the thing itself.

As a result, the object's displacement of volume is:

18.9 mL - 43.9 mL = 25.0 mL

The item has a capacity of 18.9 mL.

The mass divided by the volume gives the density, so:

D = m / V = 73.5 g /18.9 mL

D = 3.89 g/mL

Hence, density of Solid object is 3.89 g/mL

(C)

Volume of water in beaker = 425 ml

Density of water is 1g/ml

Density = Mass/Volume

Mass = Density x Volume = 425 x 1 = 425 gram

Hence, mass of water in grams is 425 gram

Learn more about Concentration here:

https://brainly.com/question/17206790

#SPJ9

Number of atoms present in 9.6g of Mg element is 24.08 × 10^23

Given,

given mass of magnesium is 96g

molar mass of magnesium 24 g/mol

First we will find out number of moles in 96g of magnesium.

Number of moles = given mass / molar mass

= 96 / 24 = 4

To find number of atoms we will multiply no of moles to avagadro number

number of atoms = 4 × 6.02 × 10^23

= 24.08 × 10^23

Hence number of atoms in 96 g of magnesium are 24.08 × 10^23

Learn more about avagadro number here:

https://brainly.in/question/762547

#SPJ9

The correct statement about a water molecule, H₂O and a carbon dioxide molecule, CO₂ is: They are made from different types of atoms, combined in different ways; option D

Water molecule is a polar molecule composed of one atom of oxygen and two atoms of hydrogen.

The bond between the atoms of hydrogen and oxygen are covalent bonds but the molecule is polar due to the high electronegativity of the oxygen atom.

The shape of a water molecule is pyramidal.

Carbon dioxide molecules are composed of two atoms of carbon and one atom of oxygen joined together by covalent bonds.

Carbon dioxide is non-polar and the shape of the molecule is linear.

Therefore, comparing a water molecule H₂O to a carbon molecule CO₂ shows that they are composed of different atoms arranged differently.

Learn more about shape of H₂O and CO₂ molecules at: https://brainly.com/question/20352255

#SPJ1

Note that the complete question is given below:

**Compare a water molecule, H2O, to a carbon dioxide molecule, CO2.**

Which statement is true?

They are made from the same types of atoms combined in the same way.

They are made from different types of atoms, combined in the same way.

They are made from the same types of atoms, but combine in different ways.

They are made from different types of atoms, combined in different ways.

The mass of water in flask is 9.994g, where an empty flask has a mass of 93.625g containing 10.00ml sample of water in it with a mass of 103.619g.

In analytical chemistry, for preparation of a solution with exact concentration precise determination of mass or  volume is required. We can determined mass precisely by using a Sartorius balance and volume by volumetric flask, burette, or pipette.

Given,

Mass of empty flask = 93.635g

Mass of the flask filled with water = 103.619g

Mass of the water in the flask =?

Therefore,

The mass of water(M) in the flask is -

M = (Mass of the flask filled with water) - ( Mass of the empty flask)

   = (103.619g) - (93.625g)

   = 9.994g

Hence,

The mass of water in the flask is 9.994g

To learn more about Mass

https://brainly.com/question/19694949

#SPJ1

Molecular formula of Tartaric Acid is C ₄ H ₆ O ₆ .

As it is given that ,

C = 32 . 04 %

H = 4 . 03 %

O = 63 . 96 %

So , composition in grams is :

C = 32.04 g

H = 4.03 g

O = 63.96 g

Now we have to find no. of moles of each element :

C = 32.04 / 12 = 2.67

H = 4.03 / 1 = 4.03

O = 63.96 / 16 = 3.99

Dividing no. of moles with smallest no. of moles .

For C , 2.67 / 2.67 = 1

For H , 4.03 / 2.67 = 1.5 ≈ 2

For O , 3.99 / 2.67 = 1.49 ≈ 2

So , Empirical formula = C₂ H₃ O₃

E.F. Mass = 24 + 3 + 48 = 75 amu

Molecular  mass = 150 amu

So , n = Molecular  mass / E.F. Mass

      n = 150 /75

      n = 2

So , Molecular formula = ( C H₂ O₂ )n

=  ( C₂ H₃ O₃ ) ₂

= C ₄ H ₆ O ₆

Hence , Molecular formula of Tartaric Acid is C ₄ H ₆ O ₆ .

To learn more about Molecular and Empirical Formula kindly check :

https://brainly.com/question/1603500

#SPJ1

Answer:

Coal Is A Combustible Black Or Brownish Black Sedimentary Rock With A High Amount Of Carbon And Hydrocarbons. Coal is Classified As As A Nonrenewable Coal Energy Source Necause It Takes Millions Of Years To Form .Coal Contain The Energy Stored By Plant That Lives Hundreds Of Millions Of Year Ago In Swamphy Forests .

The number of trucks is 205 trucks

The specific gravity refers to the ratio of the density of an object to the  density of water. This implies that the density of the object is 0.00325 g/cm^3.

Now;

Density = mass/volume

volume of the object = 48.0ft ^3 or 1.359 * 10^6 cm^3

Thus we can obtain the mass of the object from;

mass = density * volume =  0.00325 g/cm^3 * 1.359 * 10^6 cm^3

= 4417 g

We have to convert 1 ton to gram and have 907185 g

The number of trucks that we need to transport this quantity is;

907185 g/4417 g = 205 trucks

Learn more about specific gravity:https://brainly.com/question/8808140

#SPJ1

Explanation:

basically first you have to understand these definitions

*mass number ( e.g. where it says oxygen 16 or 17 - it's basically that number at the top)

mass number is the 'number of protons + number of neutrons'

now this will help you do the first question

if you do 16 -8 = 8 ( that's how she got 8 neutrons)

another thing you need to know is that all the time the number of protons = the number of electrons ( they are the same)

this will help you answer table 2

for fluorine it says there are 9 electrons, you automatically have to think 9 electrons means 9 protons too, ( I think she has got that wrong, it's supposed to be 9 protons not 19)

if you have 9 protons and the given 10 neutrons and add them together you will get the mass number which is supposed to be 19

then if you try out the same rules for argon you will see they work - the number of electrons and protons are same and when you find out the protons, you can just take that away from the mass number ( which is number of protons + neutrons) to get just the number of neutrons.

Hope this helps you :)

Answer: 122 cm^3

Explanation:

2500.0 g * 1 cm^3/20.5 g=

2500.0 * 1/20.5=

2500.0/20.5=122 cm^3

Answer:lol

Explanation:

The terms used to complete the statement are:

In this experiment:

Select term variables:

1. Source of paper towel used

2. Light intensity

3. Temperature of the room

The addition of water to the paper towel is the:

Independent variable (sometimes referred to as the manipulated variable or cause variable).

The number of pill bugs observed on each paper towel over time is the:

Dependent variable (sometimes referred to as the responding variable or effect variable).

Learn more about Variables here:

https://brainly.com/question/1479694

#SPJ7

The question attached here is seems to be incomplete, the complete question is

Select the correct term to complete each sentence:

1. The source of paper towel used, light intensity, and temperature of the room are all __________ variables in this experiment.

2. The addition of water to the paper towel is the  __________ variable.

3. The number of pill bugs observed on each paper towel over time is the  __________ variable.

Strain energy for the conformer is 13.8 kj/mol

Energy of eclipsed H-H bond is 4.0 kJ mol

Energy of eclipsed Н-СH3 bond is 5.8 kJ mol

Total strain energy of conformer (S,) E=2×ECLIPSED(H-H)+eclipse(H-CH3)

Substitute, 4.0 kJ mol for eclipsed (H-H) and 5.8 kJ mol for eclipsed (H-CH thus,

E =2x4.0 kJ mol +5.8 kJ mol

E=13.8 kJ mol

To know more about  conformation  visit : https://brainly.com/question/15215912

#SPJ1

Answer:

what are you trying say about BLANK 7 times?????????!!!!!!!!!!!!!!

Answer:

The correct answer is blank

Explanation:

plato

0.1535g is the mass of the air contained in the flask.

A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Mass divided by volume is the formula for density in mathematics: ρ = M/V. where m is the mass, V is the volume, and ρ is the density.

The given are:

1.      Mass = ?

2.     Density = 1.228 g/L

3.      Volume = 125mL to L

Plugging in the values we get,

ρ = M/V

1.228 = M/ 0.125

M = 0.1535g

Therefore, 0.1535g is the mass of the air contained in the flask.

Learn more about mass and density here;

https://brainly.com/question/6107689

#SPJ9

The energy of a light with a frequency of 3000 MHz is 1.9878 × 10-²⁴ J.

Energy of a wave such as light wave can be calculated by multiplying Planck's constant by the frequency of the light as follows:

E = hf

Where;

According to this question, a light wave has a frequency of 3000 MHz. The energy can be calculated as follows:

E = 6.626 × 10-³⁴J/s × 3 × 10⁹Hz

E = 1.9878 × 10-²⁴ J

Therefore, the energy of a light with a frequency of 3000 MHz is 1.9878 × 10-²⁴ J.

Learn more about energy at: https://brainly.com/question/2393994

#SPJ1

The mass in grams of calcium chloride required to prepare a 16% weight/volume solution is 80 g.

The concentration of a solution is the amount of solute present in a given volume of solution.

Concentration can be expressed as:

The unit of percentage weight/volume concentration is g/mL

The mass of calcium chloride required to prepare a 16% weight/volume solution = 16% * 500 mL * 1g/mL

The mass of calcium chloride required = 80 g

Learn more about percentage weight/volume concentration at: https://brainly.com/question/5336281

#SPJ1

Answer:

2.237 x 10²⁴ molecules CH₃CO₂K

Explanation:

To find the amount of molecules, you need to (1) convert grams to moles (using the molar mass of potassium acetate) and then (2) convert moles to molecules (using Avogadro's Number). It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 4 sig figs like the given value (3.645 x 10² = 4 sig figs).

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Atomic Mass (O): 15.999 g/mol

Atomic Mass (K): 39.098 g/mol

Molar Mass (CH₃CO₂K):

2(12.011 g/mol) + 3(1.008 g/mol) + 2(15.999 g/mol) + 39.098 g/mol

= 98.142 g/mol

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

3.645 x 10² g CH₃CO₂K            1 mole             6.022 x 10²³ molecules
-------------------------------------  x  -----------------  x  -------------------------------------  =
                                                  98.142 g                         1 mole

=  2.237 x 10²⁴ molecules CH₃CO₂K

Civilian bombing drills at home is not a way in which the US began preparing for war before officially joining.

War is defined as an intense arm conflict between states, governments societies or parliamentary groups. It is also defined as a violent conflict between states, contraries or nations.

It is very aggressive competition between groups of people, companies countries etc.

US began preparing for war before joining by positioning the economy for war, enlarging the military and giving aid to allies.

Thus, civilian bombing drills at home is not a way in which the US began preparing for war before officially joining.

To learn more about war, refer to the link below:

https://brainly.com/question/3445478

#SPJ1