How many moles of platinum atoms are in 2.408 x 1023
Answers
answer:
The mass of 4×10²¹ atoms Pt is ≈ 1 g Pt.
explanation:
Related Questions
How has the way humans communicate changed over time?
Answers
4) What is one advantage of using non-renewable resources?
Answers
Answer:
The main advantages of non-renewable energies is that they are abundant and affordable. For example, oil and diesel are still good choices for powering vehicles. Non-renewable energy is cost effective and easier to product and use.
Explanation:
there yah go
How many molecules OF2 would have a mass of .132 g
Answers
1.47 × 10²¹ molecules OF₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional Analysis Explanation:Step 1: Define
0.132 g OF₂
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of O - 16.00 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of OF₂ - 16.00 + 2(19.00) = 54.00 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 0.132 \ g \ OF_2(\frac{1 \ mol \ OF_2}{54.00 \ g \ OF_2})(\frac{6.022 \cdot 10^{23} \ molecules \ OF_2}{1 \ mol \ OF_2})[/tex]Divide/Multiply: [tex]\displaystyle 1.47204 \cdot 10^{21} \ molecules \ OF_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.47204 × 10²¹ molecules OF₂ ≈ 1.47 × 10²¹ molecules OF₂
If the heat of combustion for a specific compound is −1160.0 kJ/mol and its molar mass is 86.47 g/mol, how many grams of this compound must you burn to release 541.20 kJ of heat?
Answers
Answer:
40.34 g
Explanation:
First, we divide the heat to release by the heat of combustion to obtain the required moles of compound:
541.20 kJ/(1160.00 kJ/mol) = 0.4665 mol
So, we have to burn approximately 0.47 mol of the compound. We convert the moles to mass in grams by using the molar mass:
mass = molar mass x moles = 86.47 g/mol x 0.4665 mol = 40.34 g
Therefore, you must burn 40.34 grams of the compound to release 541.20 kJ of heat.
If an effusion experiment, it required 45 seconds for
a certain number of moles of an anknown gas to pass through
a small orifice into a vacuum. Under the same conditions, It required 18 seconds for the same number of moles of oxygen to effuse. Find the molecular mass of the unknown gas.
Answers
Answer: A vacuum. Under the same conditions 16 s were required for the same number of moles of O2 to effuse. ... The molar mass of the unknown gas is 200 g/mol. calculation ... QUESTION 1 If gas-burning appliances are vented into an unlined masonry chimney, deteriorate and crumble and may · PLS HELP
Explanation:
What is the mass number of chlorine?
Answers
Answer:
Explanation:
35.453 u
how would you separate the components in a mixture of chlorine and hydrogen gas
Answers
Please select the word from the list that best fits the definition
stage in a star's evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into
Answers
Explanation:
Giant Gas Cloud. A star originates from a large cloud of gas. ...
Protostar. When the gas particles in the molecular cloud run into each other, heat energy is produced. ...
T-Tauri Phase. ...
Main Sequence. ...
Red Giant. ...
The Fusion of Heavier Elements. ...
Supernovae and Planetary Nebulae
If one parent has sickle cell anemia and the other parent is a carrier, what is the possibility that their child will have sickle cell anemia
Answers
How does thermal energy affect chemical changes
Answers
Answer:
It makes chemicals hot or cold which makes chemicals react differently
Explanation:
mark me brainliest
When Nitrogen gas gets cold enough it can form a liquid. This liquid nitrogen is an
example of what?
A. A chemical change because it took a significant temperature drop to convert
nitrogen from gas to liquid.
B. A chemical change because the nitrogen underwent a conversion from gas to a
liquids.
C. A physical change because it was only a state change from solid to liquid.
D. A physical change because the temperature drop causes the molecules to completely rearrange.
Answers
Answer:
C.
Explanation:
Phase change is physical.
When Nitrogen gas forms a liquid is a physical change because it was only a state change from solid to liquid. Therefore, option C is correct.
What is a physical change?A physical change takes place when some of the features of the matter change but the identity of the material does not. Physical changes can be categorized as reversible and irreversible. For example, the melting of water is reversible since the melted ice can be refrozen.
Physical change can be described as a kind of change where only physical properties of matter such as solubility, color, odor, etc. can change. During physical changes in matter, there will be no chemical bonds are broken or formed between atoms in the molecule.
The chemical composition as well as the chemical nature of the material will remain unchanged while a physical change. The molecules can rearrange without changing the internal chemical composition of matter.
Therefore, changing the state of nitrogen gas is a physical change.
Learn more about physical change, here:
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HELP PLS 50 POINTSSSS
Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more
information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the
diagram. If an item describes more than one category, be sure to place it in the overlapping space.
ITEM BANK: Move to Bottom
Carbon dioxide is a product. Carbon dioxide is a reactant. Carried out in animals.
Carried out in plants
Chemical Reaction
Oxygen is a product
Oxygen is reactant Produces usable energy sourc
Cellular Respiration
Both
Photosynthesis
Answers
Answer:
Carbon dioxide is a product (cellular respiration)
Carbon dioxide is a reactant(photosynthesis)
Carried out in animals(cellular respiration)
Carried out in plants(both)
Chemical reaction(cellular respiration)
Oxygen is a product(photosynthesis)
Oxygen is a reactant(cellular respiration)
Produces usable energy source(photosynthesis)
Your welcome!!! Plz mark brainliest.
Answer:attached is the correct answer
Explanation:
Photosynthesis and Respiration
Explain the following terms Sublimation
Answers
Answer:
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. ... The reverse process of sublimation is deposition or desublimation, in which a substance passes directly from a gas to a solid phase.
Consider the heating curve for water. At what temperature does the solid start melting? –20°C 0°C 20°C 80°C
Answers
Answer:
0°C
Explanation:
The melting point of water - the temperature at which solid water begins to melt - is 0°C at a pressure of 1 atm. In the heating curve of water, below 0°C we have solid water. Then, at 0°C the solid water starts to melt by forming liquid water. Above 0°C, when the total amount of water is in the liquid state, the liquid water begins to heat (it increases its temperature).
Answer:
the answer is 0 degrees C.
Explanation:
how can an xray image show differences between bone and soft tissues, such as muscles and lungs? How might the atoms that make up bones be different from the atoms that make up soft tissues?
Answers
Answer with Explanation:
1. An "x-ray image" shows the difference between the bones and soft tissues because the bones appear white in color while the soft tissues appear gray in color.
2. The reason behind the difference in the appearance of bones and soft tissues on the x-ray film is their density. Bones are denser than soft tissues, which means that its atoms are closely-knitted when compared to the soft tissues that are far apart from each other. This allows the x-ray radiation to be absorbed by the bone while it passes through most of the soft tissues.
This is the reason why pregnant women are advised not to undergo an x-ray examination because the fetus is denser and it will surely absorb the x-ray radiation.
An X ray is a X wave radiation that can penetrate from a high EMR and has wavelengths that are shorter than the UV rays. The concept of X rays where discovered in 1895.
The X ray image shows the difference between bones and the soft tissues. As the bones appear to be white in color and soft tissues appear grey in color. As lungs also consists of bones they can vividly shown. Due to the bones being made of calcium they are different form the atoms that makes the soft tissues.Learn more about the x-ray image show differences between bone and soft.
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1.
What part of the human body is the wing most like? ANSWER
Help
Answers
What part of the human body is most likely the wing would proabably from your elbow joint and the rest of your arm but most likely it would be the elbow joint.
Which of the following options shows metallic bonding:
1.silver spoon
2.
bronze medal
3.
solid table salt
Answers
Answer:
bronze medal i guess
i hope its correct.
Explanation:
Answer:
silver spoon
Explanation:
i had this for castle learning and guessed this and it was right
What function does this cytoplasm perform in a plant and animal cells
Answers
Answer:
It helps shape, while holding and keeping organelles in their place.
Explanation:
Answer:
it holds the cell organelles
Explanation:
You are welcome
Many disciplines are involved in environmental science, including chemistry and biology which ___ and economics and political science which __. Multiple choice question.
Answers
Answer:
Contribute evidence; help us understand how people use resources.
Explanation:
Environmental science can be defined as an interdisciplinary field of science that comprises of chemistry, economics, engineering, zoology, geography, geology, biology, ecology, physics, etc., used for the study and understanding of various environmental factors, issues in relation to human life.
Many disciplines are involved in environmental science, including chemistry and biology which contribute evidence and economics and political science which help us understand how people use resources in the production of goods and services to meet the need or requirements of consumer. These resources include land, labor, entrepreneurship and capital.
does anyone have the answer key to half life gizmos !!!!!!!!!!!
Answers
What would happen to the entropy in the reaction 2O^3(9) ► 3O^2 (g)?
O A. It decreases.
O B. It increases
O c. It stays the same.
O D. It is impossible to tell.
Answers
Can someone please help me
Answers
Answer:
I would say w is the answer
Answer
The answer is W
How many molecules are in 2.0 moles of oxygen gas
Answers
Answer:
6.02 X 1023 molecules
Explanation:
Which structures group together to form a system in the human body
Answers
Answer:
organs group together to form organ systems
Explanation:
A rectangular block of copper metal has a mass of 1896 grams. The volume of the block is 2cm^3. From this data, what is the density of the copper?(Please show how you got this answer)
Answers
v= volume
m= mass
p = m/v
p = 1896/3
p = 632
the density is 632
What does it mean when there is a coefficient placed before a molecule?
Provide two examples to explain your understanding.
Answers
Answer:
Coefficients are used in all chemical equations to show the relative amounts of each substance present. This amount can represent either the relative number of molecules, or the relative number of moles (described below). If no coefficient is shown, a one (1) is assumed.
Explanation:
Name the four different types of Spheres belonging to Earth and give examples of Renewable resource and the Biotic factors that exist in those spheres. There are three Abiotic (Non Living) spheres and the Biotic (Living)Biosphere exist within the three of the others
Write a short summary of the renewable resources in each sphere and explain how the biosphere interacts within the three of them
Answers
Answer:
Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).
Explanation:
5.Calculate the number of moles of 18.0 dm3 of carbon monoxide (CO) at rtp.
Answers
Answer:
0.81mole
Explanation:
Given:
Volume of carbon monoxide = 18dm³
Unknown
Number of moles of carbon monoxide = ?
Solution:
To solve this problem;
1 mole of any gas at rtp occupies a volume of 22.4dm³
So;
x mole of carbon monoxide will occupy a volume of 18dm³ at rtp
22.4x = 18
x = [tex]\frac{18}{22.4}[/tex] = 0.81mole
What increases pressure?
a
more particles and higher temperatures
b
higher volume
c
number of particles
d
higher temperature
Answers
Answer:
A
Explanation:
more particles means things are heating up
Ex: Water. More bubbles form once water reaches it boiling point
Which element creates an ion who is LARGER in size than the original atom? Rb Rn S Ca
Answers
Answer:
The element S creates an ion which is larger in size than the original atom.
Explanation:
The atomic radius of elements is a measure of the size of atoms of elements. The atomic radius is defined as one-half the distance between the nuclei of identical atoms that are bonded together. Atomic radius increases on going down the group in the period table but decreases on going rom left to right across a period in the periodic able. The increase in atomic radius on going down the group is due to the addition of an extra electron shell to successive atoms of elements in a group. However, atomic radius decreases across a period due to increase in the positive charge of the nucleus of elements in the same period.
When atoms of elements form ions, the ionic radius of the resulting ion can either increase or decrease. For positive ions, the ionic radii decreases due to loss of electron increasing the attraction of the positive nucleus or even a complete loss of an electron shell. For anions, ionic radii increases due to gain of electrons which results in greater repulsion among neighboring electrons.
Among the elements given, rubidium (Rb), and calcium (Ca) for cations, hence, their size becomes smaller. Radon, Rn, being a noble gas is relatively inert, but forms positive ions when it does take part in reactions. Sulphur, S, however forms an anion, S²⁻, hence, its size increases.