A gas of 250 ml at 20°C and 720 Torrs. What volume would the gas occupy at STP ?
Answers
Answer: The gas would occupy volume of 221 ml at STP
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)
where,
\(P_1\) = initial pressure of gas = 720 torr
\(P_2\) = final pressure of gas = 760 torr (at STP)
\(V_1\) = initial volume of gas = 250 ml
\(V_2\) = final volume of gas = ?
\(T_1\) = initial temperature of gas = \(20^oC=273+20=293K\)
\(T_2\) = final temperature of gas = \(273K\) (at STP)
Now put all the given values in the above equation, we get:
\(\frac{720\times 250}{293}=\frac{760\times V_2}{273}\)
\(V_2=221ml\)
The gas would occupy volume of 221 ml at STP
Related Questions
Does anybody knows where Cocomelon was produced? Please tell the address if you know it.. If you tell the address. There is a 100% chance you will get brainliest.
Answers
Answer:
orange county California
In a reaction of yeast and hydrogen peroxide, the yeast causes a reaction in which the hydrogen peroxide breaks apart to form oxygen gas and water. Heat is released (given off) in this experiment, which would indicate a(n) ____________________ reaction.
A) equilibrium
B) endothermic
C) physical reaction
D) exothermic
Answers
Answer:
D, exothermic reaction
Answer: it indicates exothermic reaction
Explanation:
When vinegar and baking soda are mixed together, they experience a chemical change.
What evidence given would lead a person to think that the change is a chemical change?
the solution heats up or cools off
the solution changes shape
the solution changes size
Answers
The reason is temperature change.
chemical change could be a change of color or odor or formation of other things like gas or precipitate.
please solve this for me
Answers
The standard reduction potential for the half-reaction of Be^2+ + 2e^- -> Be is given as E^0 = 3.83 V.
For the half-cell Hg^2+ | Hg, the standard reduction potential is not provided in the given information. To calculate the electric potential for the voltaic cell, we need the reduction potential for the Hg^2+ | Hg half-cell.
A voltaic cell, also known as a galvanic cell or an electrochemical cell, is an electrochemical device that generates electrical energy through a spontaneous chemical reaction. It consists of two half-cells connected by an external circuit and a salt bridge or porous barrier that allows the flow of ions between the two half-cells.
Each half-cell consists of an electrode immersed in an electrolyte solution. The electrode is typically made of a metal or a conductive material, and the electrolyte is a solution containing ions that can participate in the redox (reduction-oxidation) reaction.
Learn more about electrochemical cell on:
https://brainly.com/question/23631454
#SPJ1
Answer:
The standard reduction potential for the half-reaction of Be^2+ + 2e^- -> Be is given as E^0 = 3.83 V.For the half-cell Hg^2+ | Hg, the standard reduction potential is not provided in the given information. To calculate the electric potential for the voltaic cell, we need the reduction potential for the Hg^2+ | Hg half-cell.
Help?
The question is down below.
Answers
Relative Dating Using Index Fossils
Index fossils can help geologists compare rock at locations .
• First, geologists give a relative age to a layer at one location.
• Index fossils help identify where may have occurred.
• Then that layer can be to other locations.
The answer choices is layers, distance, compared, unconformities
Answers
Index fossils can help geologists compare rock Layers at Distance locations.
Index fossils help identify where Unconformities may have occurred.
Then that layer can be Compared to other locations.
If it takes 56.7 min for the concentration of a reactant to drop to 18.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1? You do not need to show your work. You can just write the answer in the space provided below
Answers
Answer:
0.00302min⁻¹ = k
Explanation:
In a first order reaction the concentration of the reactant decrease following the equation:
ln[A] = -kt + ln[A]₀
ln [A] / [A]₀ = -kt
Where [A] represents actual and initial concentration of the reactant, k rate constant and t time.
As the reactant drop to 18.0% of its initial concentration [A] / [A]₀ = 0.18
And time = 56.7min:
ln [A] / [A]₀ = -kt
ln 0.18 = -k*56.7min
-1.715 / 56.7min = -k
0.00302min⁻¹ = k
What is the name given to this group of elements?
a.
halogens
c.
transition metals
b.
alkali metals
d.
noble gases
Answers
Answer: The answer is A. Halogens
Explanation:
I hope this helps you :)
Ricardo and Maria conducted an experiment to test if the mass of a ball affects how fast it would roll down a ramp. They set up the experiment using a ramp and three balls of different masses. They tested each ball once and recorded their results. They concluded that the more mass a ball has, the faster it will roll down the ramp. Why is this experiment not reliable?
Their experiment was not controlled.
Their experiment did not test enough variables.
Their experiment was not performed multiple times.
Their experiment was not performed by multiple people.
Answers
Ammonia and water react to form ammonium hydroxide, which is found in many household cleaners. The equation shown above to represent this reaction is balanced because ________________
A. hydrogen is found twice on both sides of the equation
B. water is present
C. the same number of atoms of each substance is present on both sides of the equation
D. here are a total of four elements on each side of the equation
Answers
Explanation:
A. hydrogen is found twice on both sides of the equation
please answer this questions!!!
Answers
The nucleus of element “X” is pictured to have 8 protons and 8 neutrons.
The nucleus always has a positive charge based on the number of protons in it.
Each proton has a charge of +1. There are 8 protons, so the charge of the nucleus is +8.
Neutrons have no charge (also called a neutral charge) so the number of neutrons will not affect the charge of the nucleus.
2. The electrical charge of element “X” is -2 if two electrons are added to its valance shell.
Each electron has a charge of -1. There are 8 electrons in the photo and we are adding 2, which is a total of 10 electrons. This means the electrons have a total charge of -10.
A simple way to find the overall charge of an atom is to subtract the number of electrons from the number of protons.
8-10=-2
The 8 positive protons and 8 negative electrons cancel each other’s charges, leaving the atom with the charge of two electrons, 2-.
I hope I explained this well, feel free to ask any questions! Have a good day.
In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.
Answers
Answer:
No, a plastic wire would not conduct electricity. This is because plastic is an insulator that does not allow electric current to flow through it. In a wire, electrical conductivity is provided by the movement of charged particles - typically, electrons. Copper is an excellent conductor of electricity because it has a high number of free electrons that are not bound to atoms and can move through the wire very easily. However, in a plastic wire, the tightly bound electrons of its atoms do not allow for the free flow of charges, thus preventing the passage of electric current.
What are some ways that students and staff of a school can help slow water, land, and air pollution?
Answers
Answer:
By recycling and cleaning up there community.
Explanation:
Match the term to its definition (Lessons 6.03, 6.04 and 6.05)
(i can't fit this all without confusion)
Answers
Answer: the first paragraph is rain forest biome and the 2nd one is arctic tundra biome and finally the last paragraph is ocean or marine biome
Explanation:
rain forests have warm temperatures and include alot of animals and plants , artctic tundra biome includes cold temperatures ice stuff and all that and ocean or marine biome is pretty much just the ocean with seals , whales and marine life yk.
NEED HELP FAST
Identify whether this molecule is a monomer or polymer and explain your answer.
Answers
Its a polymer because there are two of the same monomer (and the CH2OH which is different) that join together to create the one polymer. By definition a polymer is a molecule made up of smaller repeating monomers.
Carbohydrate molecules A and B come in contact with the cell membrane of the same cell. Molecule A passes through the membrane readily, but molecule B does not. It is most likely that molecule A is
Answers
Where is the DNA stored in a cell?
Answers
Answer: nucleus
Explanation:
calculate the number of moles equivalent to 5.0 gram of calcium oxide
please help
Answers
Answer:
The answer is 0.089 molExplanation:
The number of moles of a substance can be found by
\(n = \frac{m}{M} \)
where
n is the number of moles
M is the molar mass
m is the mass of the substance
To find the number of moles we must first find the molar mass
Chemical formula for calcium oxide is
CaOSo the molar mass of CaO is
M( CaO) = 40 + 16 = 56 g/mol
Mass of CaO = 5.0g
Substitute the given values into the formula
The number of moles in 5.0g of calcium oxide is
\(n = \frac{5 \: g}{56 g/mol} \)
We have the final answer as
n = 0.089 molHope this helps you
\( \LARGE{ \boxed{ \pink{ \rm{Answer}}}}\)
☃️ Chemical formulae ➝ \(\sf{CaO}\)
How to find?For solving this question, We need to know how to find moles of solution or any substance if a certain weight is given.
\( \boxed{ \sf{No. \: of \: moles = \frac{Given \: weight}{Molecular \: weight} }}\)
Solution:Atomic weight of elements:
Ca = 40O = 16❍ Molecular weight of \(\sf{CaO}\)
= 40 + 16
= 56 g/mol
❍ Given weight: 5 g
Then, no. of moles,
⇛ No. of moles = 5 g / 56 g mol‐¹
⇛ No. of moles = 0.089 moles \(\approx\) 0.09 moles
⚘ No. of moles of Calcium oxide in the given weight = 0.09 moles approx.
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Explain why the change you made caused the stingwing population to decrease. Use energy storage molecules to explain your answer.
Answers
Answer:
Reprduce
Explanation:
The decrease in the stingwing population was caused by the change in energy storage molecules. Stingwings rely on energy storage molecules, such as glycogen and fats, to fuel their activities and survival. If the change disrupted their ability to store and utilize these molecules, their energy levels would decrease, leading to decreased population size.
In this activity, you will investigate how the motion of objects of different masses is affected when the same force is applied to them. You will use the scientific method to set up your experiment. Question__________________________________.
Answers
Answer:if a bot walks up to you what do you do
Explanation:
you slap the F out of them
lol help fill the blanks
Answers
1. Using D10W and a vial of NaCl 4 mEq/mL, how many mL of NaCl are needed to prepare 250 mL of a
D10/NS solution?
a. 4.8mL
b. 9.6ml
c. 19.6mL
d. 154mL
Answers
To prepare 250 mL of a D10/NS solution using D10W and a vial of NaCl 4 mEq/mL, you would need 9.6 mL of NaCl. Normal saline (NS) contains 154 mEq/L of sodium chloride (NaCl). To prepare 250 mL of NS, you would need 250 mL * (154 mEq/L) = 38500 mEq of NaCl. Since the vial of NaCl contains 4 mEq/mL, you would need 38500 mEq / (4 mEq/mL) = 9625 mL = 9.6 mL of NaCl. So the correct answer is b. 9.6ml.
How would the kinetic energy of the rider change if his mass were doubled?
Answers
Answer:
Explanation: A
QUESTION 1.... Please help!!
Competition between two organisms for resources is a limiting factor because...
A. There is only a limited amount of food and living
space available in any ecosystem.
B.Predator-prey populations often increase and decrease in cycles.
C.Abiotic factors such as light, water, and temperature are present.
D.Cities, highways, campgrounds, and orchards provide alternate environments for
animals and plants.
Answers
7: How many times can a volcano erupt?
Answers
Answer:
Some small volcanoes only erupt once in their lives,
while other volcanoes erupt multiple times. Kilaeua volcano in Hawaii, which has been erupting continuously since 1983, is the world's most active volcano. While some volcanoes erupt at regular intervals, there are always exceptions to the rule
Answer:
small volcano's only 1 time while big volcano's mutiple times
Explanation:
The diagram shows the process of gas exchange in an animal. What happens during gas exchange in this animal?
A. Blood moves into the lungs
B. Blood moves out the lungs
C. Oxygen moves from the blood to the lungs
D. Oxygen moves out of the lungs and carbon dioxide moves into the lungs
Answers
Answer:
D I think
Explanation:
Which statement about scientific laws is correct?
O Laws cannot be expressed in terms of a mathematical equation.
O Laws are based on proven hypotheses by many different scientists.
O Laws are statements of what WILL happen in a situation.
O Laws explain WHY things are the way they are.
Answers
Laws are based on proven hypotheses by many different scientists
Robert is thinking about buying a new refrigerator. His old refrigerator runs at about 43% efficiency. Which most likely accounts for the remaining 57% of the energy?
A: It is used up by the light in the refrigerator.
B: It is released to the surroundings as heat
C: It is converted into mechanical energy.
D: It stored as a form of potential energy.
Answers
Answer:
D it stores as a firm of potential energy
What is the main way viruses cause disease in the body
A. By feeding directly on your body parts
B. By using your body's cells to make new viruses
C. By absorbing nutrients from your bloodstream
D. By breaking down your body's cells for nutrients
Answers
Answer:
the answer is B
Explanation:
this is because viruses need to enter a host cell to start reproduce. they usually use your cell to create "virus making factories".
hope it helps
no problems
Calculate the volume (in cm3
) of 54 g
of water at 1 ∘C
.
Express the volume in cubic centimeters to two significant figures.
