If 0.42 mole of helium occupies 9.9 L, how
many moles must be added to inflate the
balloon to 17.0 L?

Answers

Answer 1
Answer :

0.301 moles

Further explanation

Avogadro's hypothesis:  

In the same T,P and V, the gas contains the same number of molecules  

So the ratio of gas volume will be equal to the ratio of gas moles  

 

Given

n₁=initial mol of Helium : 0.42

V₁=initial volume : 9.9 L

V₂=final volume : 17 L

Required

number of moles added

Analysis

Use formula :

[tex]\tt \dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}[/tex]

Solution

[tex]\tt n_2=\dfrac{n_1\times V_2}{V_1}\\\\n_2=\dfrac{0.42\times 17}{9.9}\\\\n_2=0.721~moles[/tex]

moles added :

0.721 - 0.42 =0.301 moles

Paraphrase

0.301 moles must be added to inflate the  balloon to 17.0 L


Related Questions


Who said that the atom had to have small negative particles suspended
in a positive cloud-like substance?

Answers

Answer:

hello

Explanation:

Determine the atomic number, atomic mass and element name of the following:

14 N
14
7

Answers

Answer:

Carbon-14

Carbon-14: with 6 protons and 8 neutrons, and an atomic mass of 14.

oven mitts reduce which type of thermal energy transfer when you take a hot pan out of an oven

Answers

Answer:

conduction

Explanation:

Conduction is a form of thermal energy transferred through direct contact. Using an oven mitt reduces the amount of heat transferred:)

Answer:

The answer is Conduction.

Explanation:

I took AP3X quiz. Hope this helps.

Which of these is an example of a biotic factor?
hot desert sun
Mojave River
acrid desert air
Mojave grasshoppers

Answers

Answer: Mojave grasshopper

Explanation: this is the answer because it is living

Answer: Mojave Grasshopper

A biotic factor is something that it living. An abiotic factor is something that is nonliving. The only object that is living in the choices is the grasshopper. :)

why should scientists perform expierements

Answers

Answer:

Experiments are most useful when investigating predictions derived from explicit theories, and it is theories, rather than experimental results, that are properly used to explain features of natural settings.

Answer:

to explore new possibilities

hope it helps

Based on the diagram shown, how many electrons does this atom have?
a.six
b.three
c.nine
d.one

Answers

Answer:

B. Three

Explanation:

The three dots that are surrounding the nucleus are electrons.

Explanation:

According to the diagram, the atom has 3 electrons.

Electronic configuration =

1s² 2s¹

Element = LithiumSymbol = LiPeriod = 2Group = 1 (Alkali metal) valency = 1

Therefore,

Option B is correct✔

The following image shows the Atomic level of an element. In the image, which of
the following processes is NOT taking place as the element becomes stable. *
152 25+ 2p 35
152252 2p on ~ (Nel
le-
Na
+
Nat"
Tose
Iyolence election
8 valence electrons
O The loss of an electron Anveils an octet at the 2nd energy level to make it stable
The loss of an electron allows the element to take on a noble gas electron
configuration
Na is sodium is a metal and loses 1 e-
O The cation will use a type Ii naming system
O Na is neutral, loses 1 e- and then becomes a positive charged ion Na+

Answers

Answer:

D. The cation will use a type II naming system

Explanation:

As the element becomes stable, Option D is NOT taking place. That means that as the element becomes stable, the cation will NOT use a type II naming system. This is because in Type II binary compounds, the metal is not found in either Group 1 or Group 2 on the periodic table. It is as a result of this that the cation will not use a type II naming system.

Group 1 and Group 2 elements make use of type I naming system because in Type I binary compounds, the metal is present.

Option D is the correct answer.

Explain, in your own words, what an electron configuration shows :

Answers

It describes where electrons are located around the nucleus of an atom

A reaction begins with 130.5g of substance X and substance Y. How many grams of
substance X and Y are there at the end of the reaction?

A) not enough information provided
B) 100g
C) 65.25g
D) 130.5g

Answers

Answer:

130.5g

Explanation:

At the of the reaction, the combined mass of X and Y will be 130.5g.

The premise for this conclusion is based on the law of conservation of matter.

This law states that "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another".

In essence, in a chemical reaction, there is no mass loss.

The amount of product in the reaction is expected to be the same as the amount of reactants used in the experiment. When we start with 130.5g then we should end with 130.5g

Arrange the following elements in order from lowest to highest first ionization energy : , Ar , Cs, Na *

Answers

Lowest Cs, Na, highest is At

Answer:

Lowest Cs, Na, highest is At

Explanation:

Which of the following has the larger atomic radius?
O Cs
O Ca
O Li
O Ba

Answers

Cs has the larger atomic radius

Hope it helps

Hair is composed of a protein called cellulose
O
True
O False

Answers

Answer:True

Explanation:

Iv done this before

Wax melts when it is heated. Which most likely describes what is true of the result of this reaction?

The bonding of the atoms is not the same before and after the change.
The wax has the same density before and after the change.
The same amount of wax exists before and after the change.
The wax cannot be changed back into a solid.
quickly help!!!

Answers

Answer:

The same amount of wax exists before and after the change.

Explanation:

Answer:

c -the same amount of wax exists before and after the change-

Explanation:

I did the quiz (edg.)     :)

Some notes for you:

A physical change is a change in some of the physical properties of matter, but not in its identity.

Wax melting is an energy change, and the energy change can be reversed, which means the wax cools into hard wax again. The wax didn't leave, nor did it somehow get less of it. It stays the same! :)

I hope you have an amazing day, I mean it. God bless you!

john 7:37 <3

A student flipped a coin 1000 times and recorded the outcome of each
and every flip. Her data showed 517 Heads and 483 Tails. Knowing the data
should have turned out with the same number of heads as tails, what is
her % error for tails?
17

3.4%

83

-0.034%

None of these

Answers

Answer:

i guess none of these or 3.4% for 10%

Explanation:

I think the answer should be in the 30 to 40 number scale

FOR 35 POINTS & A BRAINIST*
1.) For an atom of sulfur, there are
A.) two electron shells with 6 valence electrons
B.) three electron shells with 6 valence electrons
C.) four electron shells with 6 valence electrons
D.) five electron shells with 6 valence electrons

2.) Which atom has four electron shells with 7 valence electrons?
A.) F
B.) CI
C.) Br
D.) I

3.) Which atom has three electron shells with 8 electrons in its outermost orbit?
A.) He
B.) Ne
C.) Ar
D.) Kr

4.) Which method should be used to draw electrons that are involved in a collision during a chemical reaction?
A.) Bohr's model
B.) Lewis dot model
C.) Addition model
D.) Subtraction model

Answers

1.) B

2.) C

3.) C

4.) B

I genuinely double checked that these were right! I hope it helps!!

The central core of an atom is called the __?

Answers

Answer: Atomic Nucleus!

Explanation: All atoms have a dense central core called the atomic nucleus. Forming the nucleus are two kinds of particles: protons, which have a positive electrical charge, and neutrons, which have no charge.

(Yes, it was from google.)

An atom has 24 protons, 22 electrons, and 28 neutrons. What is the ATOMIC # of the atom?

Answers

22 would be the answer

what is the density of a liquid if it's volume is 125 mL and it's mass is 50g?

Answers

Answer:

0.4g/ml

Explanation:

density= mass/volume

density=50g/125ml

density=0.4g/ml

Which of the following atoms has the largest radius?
a. lithium
b. lead
C. cesium
d. fluorine
e. carbon

Answers

Explanation:

first one, a. lithium. it's the largest

Which best explains how convection affects the atmosphere

Answers

Answer:

The heating of the Earth's surface and atmosphere by the sun drives convection within the atmosphere and ocean. This convection produces winds and ocean currents. The greater the pressure differences between a low-pressure area and a high-pressure area, the stronger the winds

Someone please help will mark as brainliest

Answers

Answer:

If heart disease is suspected, we use two-dimensional doppler imaging technologies that take in-depth images of the heart. The doppler system records sound waves as they bounce off blood cells in your heart and change pitch. The blood flow shown in these images is colorized to better detect any problems.

Explanation:

Answer:

look it up it should a better answer than me

Explanation:

The percent by mass is the ratio of the mass of each element to the total mass of the compound expressed as a percentage. Attached is the formula. What is the percent by mass of Oxygen in 10 grams of H20 given the mass by analysis of oxygen in that sample is 8 grams. (Answer should be given with a %. i.e. if the answer were 23% you answer in the textbox would be 23%)

Percent by mass = mass of solute mass of solution x 100 ​
help me please:((

Answers

The percent by mass of Oxygen : 80%

Further explanation

According to Proust: the mass percentage of the constituent elements of a compound is constant⇒compounds have a constant composition of elements

Given

mass of Oxygen (solute)= 8 grams

mass of H₂O(solution)=10 grams

Required

Percent by mass

Solution

[tex]\tt percent~by~mass=\dfrac{mass~oxygen}{mass~solution}\times 100\\\\percent~by~mass=\dfrac{8}{10}\times 100=80[/tex]

Which form of energy can be connected closely to climate change?
hydroelectric

coal

solar

wind

Answers

Answer:

coal

Explanation:

Hope this helps please mark brainliest

The ability to exert a force that causes an item to move is what is meant by the definition of energy as the "power to accomplish work." Even though the definition is unclear, the meaning is clear: energy is simply the force that moves things. Potential energy and kinetic energy are the two categories of energy.

Which source of energy has a direct impact on climate change?

Renewable energy is frequently cited as the most important shift the world can make to fend off the worst consequences of global warming. This is due to the fact that renewable energy sources like solar and wind don't produce greenhouse gases like carbon dioxide, which contributes to global warming.

Wind, sunlight, bioenergy (organic matter burned as fuel), and hydroelectricity, including tidal energy, are a few examples of renewable energy sources.

The ability to exert a force that causes an object to move is what the definition of energy as "power to accomplish work" refers to. Despite the ambiguity of the definition, the meaning is clear: energy is simply the force that moves things. The two types of energy are potential energy and kinetic energy.

To learn more about Renewable energy refer to:

https://brainly.com/question/79953

#SPJ2

What is the freezing point of neon F and C?

Answers

Answer:

-415.5°F and -246°C

Explanation:

what would most likely be joined by an ionic bond?

Answers

Answer:

magnites

Explanation:

i dont know what  this is so sorry but my guess is magnites.

Answer:

Your a bad person, i gave 100 points for just 3 paragraphs and you and another person just put 1 sentence, you have a bad moral

Explanation:

is combustion an example of the law of conservation of matter and why?

Answers

Answer:

Explanation:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted.


Using the diagram to guide your answer, which of the following statements are true? Choose all that apply.

I The reactants (initial) contain 6 atoms of hydrogen and 2 atoms of nitrogen
The products (final) contain two atoms of nitrogen and six atoms of hydrogen
I The number of atoms is the same in the initial and final boxes
2 molecules of nitrogen react with 3 molecules of hydrogen to produce 2 molecules of ammonia
The number of molecules is the same in the initial and final boxes

Answers

Answer: The reactants (initial) contain 6 atoms of hydrogen and 2 atoms of nitrogen

The products (final) contain two atoms of nitrogen and six atoms of hydrogen

The number of atoms is the same in the initial and final boxes

Explanation:

Atom is the smallest unit of an element which may or may not exist independently.

Molecule is the smallest unit of a pure substance that consists of two or more atoms held together by a chemical bond .

Molecule of a Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.  Example:  [tex]NH_3[/tex]

Molecule of an element is a pure substance formed by combination of same types of atoms bonded by a chemical bond. Example: [tex]H_2[/tex] and [tex]N_2[/tex]

Here one molecule of nitrogen ([tex]N_2[/tex]) combines with 3 molecules of hydrogen ([tex]H_2[/tex]) to give 2 molecules of ammonia. ([tex]NH_3[/tex]).

3. Why do gases deviate from the ideal gas law at high pressures? A. Molecules have finite volume. B. Cohesive forces increase the volume from the ideal. C. Increasing pressure increases the temperature of the gas. D. Collisions between molecules occur more frequently as pressure increases.

Answers

Answer:

A. Molecules have finite volume.

Explanation:

Gases deviate from the ideal gas law at high pressures because its molecules have a finite volume.

Real gases have a finite volume which enables more interaction between the molecules while ideal gases are assumed not to have a finite volume or occupy space which is why it lacks any form of interaction between its molecules.

This difference is the deviation between the real and ideal gases.

ANSWER PLS ASAP Fireworks are an example of a
amount of energy being

Answers

Answer:

large, released

Explanation:

As we know, fireworks contain l o t s of energy, even before the burst of colors release. So i think choice 3 is the answer.

i hope this helps :)

The diagram above represents the melting of H2O(s). A 2.00mole sample of H2O(s) at 0°C melted, producing H2O(l) at 0°C. Based on the diagram, which of the following best describes the amount of heat required for this process and the changes that took place at the molecular level?

Answers

Answer

Heat : 12 kJ,  to maintain hydrogen bonds

Further explanation

Given

A 2.00mole sample ⇒ n = 2 mol

H₂O(s) at 0°C melted, producing H₂O(l) at 0°C

Required

the amount of heat required

the changes that took place

Analysis

Conversion of mol to mass

Use formula of Heat  :

Q = mLf (melting/freezing)  

Lf=latent heat of fusion  (for water=334 J/g)

Solution

mass H₂O(MW=18 g/mol) :

[tex]\tt mass=2\times 18=36~g[/tex]

Heat required :

[tex]\tt Q=36\times 334=12024~J\approx 12~kJ[/tex]

The absorbed heat is used to maintain hydrogen bonds in water molecules (there are two hydrogen bonds per molecule)

Paraphrase

The amount of heat required : 12 kJ, and to maintain hydrogen bonds

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