Chemistry Middle School

How many molecules would there be in 10.5 L of carbon dioxide at 40.0 C and 252 kPa

Answers

Answer 1

Answer:

6.14×10²³ molecules

Explanation:

Data obtained from the question include:

Volume (V) = 10.5L

Temperature (T) = 40°C

Pressure (P) = 252 kPa

Next, we shall determine the number of mole of CO2 present.

This can be obtained by using the ideal gas equation:

PV = nRT

Volume (V) = 10.5L

Temperature (T) = 40°C = 40°C + 273 = 313K

Pressure (P) = 252 kPa

Gas constant (R) = 8.31 KPa.L/Kmol

Number of mole (n) =.?

PV = nRT

252 x 10.5 = n x 8.31 x 313

Divide both side by 8.31 x 313

n = (252 x 10.5) /(8.31 x 313)

n = 1.02 mole

Therefore, 1.02 mol of CO2 is present.

Now, we can obtain the number of molecules of CO2 present as follow:

From Avogadro's hypothesis, 1 mole of any substance contains 6.02×10²³ molecules.

This means that 1 mole of CO2 also contains 6.02×10²³ molecules.

Now, if 1 mole of CO2 contains 6.02×10²³ molecules,

Then 1.02 mole will contain = 1.02 x 6.02×10²³ = 6.14×10²³ molecules.

Therefore, 6.14×10²³ molecules of CO2 is present.

Related Questions

1. In these two pictures, the arrows represent forces acting. Write the names of the forces in the boxes
2. Draw and label your own arrows on these two pictures to show the forces acting.
(See the image attached)
Please help!!! It will be greatly appreciated

Answers

thew one with the plane the arrow is going slightly down and the one with the ball has two arrows one for the ball and foot both going same way

Why are some incomplete fossils able to be pieced together? Full fossils of large animals can be found together. Hard tissue, like bone, never breaks or chips. Fossils require salt water to be preserved fully. Impressions from the skin can be preserved.

Answers

Answer:

Explanation:

The fossil record is considered to be incomplete because fossilization is a very rare phenomenon. Most organisms decompose quickly after their death, and their remains dispersed. In order for fossilization to occur, the remains have to be covered by sediments and stay undisturbed for thousands of years.

Answer:

The fossil record is considered to be incomplete because fossilization is a very rare phenomenon. Most organisms decompose quickly after their death, and their remains are dispersed. In order for fossilization to occur, the remains have to be covered by sediments and stay undisturbed for thousands of years.

In a group of dogs, some individuals have short fur and others have long fur. In this gropp,
the gene for the fur length trait has two alleles. The allele F is for short fur, and the allele fis
for long fur.
Marley, a dog from this group, has long fur. Marley has two alleles for long fur.
Based on this information, what is Marley's phenotype for the fur length trait?
FF
FI
short fur
long fur

Answers

Answer:

long fur

Explanation:

Phenotype refers to an individual's observable traits, such as height, eye color, and blood type ( the outside apperance ) so what is the dog's fur can be discribed as ? the answer is long fur

the answer is long fur. a phenotype is the physical appearance of an animal.

What is the difference between states of matter and phases of matter?

Answers

QUESTION:

What is the differencebetween statesof matter and phases of matter?

ANSWER:

phases of matter explains uniform chemical and physical properties of matter whereas state of matter explane the given temperature and pressure.

EXPLANATIONS:

HOPE ITS HELP

“States of matter” is a more specific and precise term than “phases of matter.” 2. State of matter is the state of a particular compound in a physical system whereas phase is a set of states within such a system. Hopes this answers your question

What is the Uncontrolled variables/limitations for this science expirement? Does the shape of an ice cube affect how quickly it grows? Need help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAP

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For my Independent variable, I put "I would be changing what I put on the ice: sand, sugar, and salt. I don't know what to put for the dependent. I read the definition. For my controls, I put "the amount of sand, sugar, and salt being put on the ice cubes.
I hope this helps!

i dont think that’s how it works

What is an ellipse please help)

Answers

normal oval shape traced by a point moving in a plane so that the sum of the distance from the other points is constant.

In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. As such, it generalizes a circle, which is the special type of ellipse in which the two focal points are the same.

Maybe they might use that math thing for Science.

How could you break down the compound calcium carbonate into the elements that make it up ? A. by melting B. by crushing C. with filter D. with chemical changes

Answers

Answer:

A: By melting

Explanation:

When calcium carbonate is heated it decomposes into calcium oxide and carbon dioxide.

A. By melting

You can break it down by thermal decomposition

A balance and a graduated cylinder are used to determine the density of a mineral sample. The sample has a mass of 16 g and a volume of 2 cm3. What is the density of the mineral sample?

Answers

Answer:

8g/cm³

Explanation:

density is mass per unit volume , it is measured in grams per unit volume

please answer this in a hurry will give 10 pts
due tommorow

Answers

Is there a word bank or something?

word bank?? if you could add those i’ll answer

which particles have aproximately the same size and mass as each other?
a.protons and electrons
b.neutron and electrons
c.protons and neutrons
d.electrons, protons and neutrons.

Answers

C. Protons and neutrons

Explanation: electrons are much smaller, at a mass of 9.11 × 10-28 grams. Protons and neutrons are both about 1.67 × 10-24 grams.

Answer and Explanation: Proton and neutron have almost the same mass.

Please help me por favor :'(

Answers

More volume, takes longer to heat all the molecules.

in a neap tide, the moon's effect on blank

Answers

Answer:

Neap tides occur during the first and third quarter moon, when the moon appears "half full"

PLEASE HELP MEEE I WILL MARK BRAINLIST FOR THIS ITS SUPER SIMPLE....BUT U MUST TYPE EVERYTHING
all I need you to do its to type out these pictures word for word it pretty simple

Answers

Answer:

in 1988, a forest fire destroyed much of yellowstone park.This photo, taken 17 years later,show that the forest is gradually growing back, small grasses first grew here and are now being replaced by small trees and shrubs, this is an example of the later stages of secondary succession.

The early stages of succession after a forest fire are shown in these pictures. taken four years after the fire. they show the charred remains of the original forest as well as the small grasses and shrubs that are beginning to throw in the back area.

During a volcanic eruption,molten lava flows over the ground and into the water. after the eruption is over the lava cools and hardens into bare rock.

lichen spores carried on the wind settle on the rock and creat soil. linchens add nutrients to the soil as they die and decay.

Ecosystems are "dynamic". this means that the ecosystem change

over time.

during the ice ages , glaciers once covered areas that are tropical rainforests today. both natural forces and human actions cause ecosystem to change

if there is a big ecosystem change caused by natrual forces or human actions , the plants and animals that live there might be destroyed. or they may be foreced to leave.

over time a new community will develop and then that community may be replaced by another.

primary succession is the type of eological succession that happens on new lands, lands where life has not yet been existed. primary succession can take place after lava flow cools and hardens into new land or glacier recedes exposing new land.

secondary succession is the type of succession happens after something destroys the habitat, such as a flood or other natrual disaster. abandoning a field that was once used for agriculture can also lead secondary successionn

The early stages of succession after a forest fire are shown in theses pictures. Taken four years after the fire, they show the charred remains of the original forest as well as the small grasses and shrubs that are beginning to grow back in the area.

Brainiest please?

Use the picture below to answer the question.
Comparing the two waves, wave B has a...

A) higher frequency.
B) greater amplitude.
C) shorter wavelength.
D) longer wavelength.

Answers

Answer: D) longer wavelength.

Explanation:

A) higher frequency and C) a shorter wavelength.

As far as I know, you calculate frequency on a graph using the number of peaks you can see. Since the wavelength is shorter (the distance between two peaks on the wave), the frequency should also be higher as more fit on the graph.

A small gap is left between the rails in the railway track. Analyze the reason.

Answers

Answer:

There could be several possible reasons for a small gap between rails on a railway track, such as:

1. Expansion joints: Railways are designed to allow the tracks to expand and contract with changes in temperature. To accommodate this expansion, small gaps are left between the rail ends and filled with expansion joints or plates.

2. Wear and tear: Over time, the rails may experience wear and tear due to heavy loads, weather conditions, and other factors. As a result, small gaps can appear between the rails.

3. Maintenance: During maintenance activities, rail tracks may be adjusted or replaced, which could lead to small gaps between the rails.

4. Environmental factors: Environmental factors such as soil shifts, earthquakes or other natural disasters can also affect the alignment of the rails, leading to small gaps.

These are some of the possible reasons for a small gap between the rails on a railway track.

Answer:

The small gap left between the rails in a railway track is intentional and serves a specific purpose. This gap is known as the rail joint, and it allows for the expansion and contraction of the rails due to changes in temperature. When the temperature changes, the metal rails will expand or contract, and if they were joined together tightly, they could buckle or become deformed, which could be dangerous for trains passing over them. The rail joint allows the rails to move slightly and prevent damage to the track.

Additionally, the rail joint also allows for maintenance and repairs of the track. If there were no gap between the rails, it would be challenging to replace a damaged rail or perform routine maintenance, such as tightening bolts or lubricating joints. With the rail joint, maintenance personnel can easily access and work on the track.

Overall, the small gap left between the rails in a railway track is intentional and serves a crucial function in ensuring the safety and reliability of the track.

Once again rocks and/or minerals

How could you determine whether
an unknown substance is a mineral?

Answers

Answer:

you can classify a mineral by its appearance and other properties. The presence of a mineral is defined by the color and luster, and the color of the powdered mineral is described by the band. Every mineral has a distinctive density. To compare the hardness of rocks, the Mohs Hardness Scale is used.

Explanation:

Answer:

Luster, hardness , colour , clevage and magnetism

Explanation:

1. Luster makes sure the light is reflected by the mineral.

2. On the 10-point Mohs scale, which is basically a scratch test, hardness is measured. Take an unidentified mineral and scrape it like a fingernail with an object of known hardness.

3. Zurite, for instance, is often a deep blue, and malachite is gray.

4. In minerals that appear to divide along one or more flat surfaces or planes, cleavage may be observed.

5. Magnetite, for instance, has a heavy pull that even weak magnets can draw. But there is only a poor attraction to other minerals, particularly chromite (a black oxide) and pyrrhotite (a bronze sulfide.)

Select the correct scientific notation form of this numeral using only 2 significant figures. 5,421,200.00 m

Answers

Answer:

5.4 × 10^6

Explanation:

which solute will result in a molecular solution?
a. HCN
b. Ba(OH)2
c. CH3COOH
d. CH3CH2OH

Answers

Answer:

d. CH3CH2OH

Explanation:

Molecular solution are solutions when a molecular compound is dissolved in them.

CH3CH2OH represents Ethanol or alcohol carrying "OH" group and is a molecule. CH3CH2OH or Ethanol forms a molecular solution in water.

The equation for Ethanol dissolving in water as follows:

CH3CH2OH(l) => CH3CH2OH(aq)

CH3CH2OH srays together as molecules. During dissolving, ethanol molecule fit into spaces between water molecules and completely mix with water.

While HCN, CH3COOH and Ba(OH)2 form ionic solution.

Hence, the correct option is d. CH3CH2OH.

How does an atom change if all of its electrons are removed?
p.s. I'll mark the first answer the brainliest if it is correct! ;)

a. The atom’s volume increases.

b. The atom’s mass increases.

c. The atom becomes positively charged.

d. The atom becomes negatively charged.

Answers

c. The atom becomes positively charged

if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom

C the atom becomes positively charged

An element that is a silver-colored liquid is?

a hydrogen
b mercury
c silver
d carbon

Answers

B. Mercury is the answer

Answer:

mercury

Explanation:

silver in color, and you can find in on the periodic table

How is density different from weight and mass?

Answers

Hello there!

How is density different from weight and mass you say? It's simple!

1. Unlike weight, density is composed of mass and volume.

2. By dividing the mass over the volume, you can determine an object's density, while weight is the product of mass and gravity.

Hope this helps :) if so, can I get Brainliest?

Density is basically how compact an object is

Weight is how heavy an object is/ how much force it exerts

Mass is how much matter is in an object

I hope this helps! If you need the formulas on how to get them you can always comment and ask :)

Does anyone have google docs?

Answers

Answer:

nope , do u have it ?

.....

Yes I do have it but why do you need it?

When the speed of the bottle is 2 m/s, the KE is kg m2/s2. When the speed of the bottle is 3 m/s, the KE is kg m2/s2. When the speed of the bottle is 4 m/s, the KE is kg m2/s2. When the speed of the bottle is 5 m/s, the KE is kg m2/s2. When the speed of the bottle is 6 m/s, the KE is kg m2/s2.
instructions
In this part of the experiment, you will be changing the speed of the bottle by dropping it from different heights. You will use the same mass, 0.250 kg, for each trial, so record this mass in Table B for each velocity. Then, calculate the expected kinetic energy (KE) at each velocity. Use the formula KE = mv2,
where m is the mass and v is the speed. Record your calculations in Table B of your Student Guide.

Answers

Answer:

Based on the given instructions, you need to calculate the expected kinetic energy (KE) at each velocity using the formula KE = mv^2, where m is the mass and v is the speed. The mass is given as 0.250 kg.

Table B: Calculation of Kinetic Energy (KE)

Speed (m/s)Mass (kg)KE (kg m^2/s^2)20.2500.50030.2500.75040.2501.00050.2501.25060.2501.500

To calculate the kinetic energy at each velocity, multiply the mass (0.250 kg) by the square of the velocity.

For example, when the speed of the bottle is 2 m/s: KE = (0.250 kg) * (2 m/s)^2 = 0.250 kg * 4 m^2/s^2 = 1.000 kg m^2/s^2

Perform similar calculations for the other velocities and record the results in Table B.

Answer:

Explanation:mass of the bottle in each case is M = 0.250 kg

now as per given speeds we can use the formula of kinetic energy to find it

1) when speed is 2 m/s