Answer:
7.2 x 10^23
Explanation:
Currently in Chemistry class
How many grams of He are necessary to fill a balloon having a volume of 4.50 × 10^{3} mL to a pressure of 1.14 × 10^{3} torr at 25.0ºC?
The mass in grams of He are necessary to fill a balloon having a volume of 4.50×10³ mL to a pressure of 1.14×10³ torr at 25.0ºC is 1.104 grams.
How do we calculate the grams from moles?Mass (W) in grams from moles (n) will be calculated by using the below equation:
n = W/M, where
M = molar mass
Moles of helium gas will be calculated by using the ideal gas equation:
PV = nRT, where
R = universal gas constant = 62.363 L.torr / K.mol
P = pressure of gas = 1.14×10³ torr
V = volume of gas = 4.50×10³ mL = 4.50 L
n = moles of gas = ?
T = temperature = 25.0ºC = 298 K
On putting these values on the ideal gas equation, we get
n = (1140)(4.5) / (62.363)(298) = 5130 / 18584
n = 0.276 moles
Now we convert this moles into mass by using the first equation as:
W = (0.276mol)(4g/mol) = 1.104 g
Hence required mass of helium gas is 1.104 grams.
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What is the molarity of the solution with a volume of 28.8 liters and 27.7 moles?
Answer: 0.962 M
Explanation:
molarity = (moles of solute)/(liters of solution) = 27.7/28.8 = 0.962 M
Giving BRAINLIEST, please HELP!
Answer:
Its the last one freezing and condensation.
Explanation:
because the line is moving up so it has to be freezing and if it was going down it would have been melting
what is kind of property is denisty?
Answer:
INTENSIVE PROPERTY OF MATTER
Explanation:
DENSITY IS AN INTENSIVE PROPERTY OF MATTER THAT ILLUSTRATES HOW MUCH MASS A SUBSTANCE HAS IN A GIVEN AMOUNT OF VALUE,
If we accelerate a radioactive isotope of an element in a particle accelerator to a speed close to that of light, what would its observed mass be compared to its mass at rest
When the speed of the particle is close to that of light, it's observed mass would be infinitely large.
To answer the question, we need to know what observed mass is.
What is observed mass in relativity?This is the mass the body of an object in relativistic motion appears to have.
So, observed mass, m' = m/√(1 - β²) where
m = rest mass and β = relative velocity of isotope to light.Now, since the speed of the particle is close to that of light, β ≅ 1.
So, m' = m/√(1 - β²)
m' = m/√(1 - 1²)
m' = m/√(1 - 1)
m' = m/√0
m' = m/0
m' = ∞
So, when the speed of the particle is close to that of light, it's observed mass would be infinitely large.
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A swimming pool reading reports that chlorine is present at 130 ppm. How many grams of chlorine are present per liter of pool water?
130 ppm will contain 0.12985167 grams of chlorine present in per liter of pool water.
What is ppm?This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L).
1001.142303 ppm is equal to 1 g/L
So, 130 ppm will contain [tex]\frac{130}{1001.142303}[/tex] grams of chlorine present in per liter of pool water which is equal to 0.12985167 gram/L.
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What is the empirical formula of a compound that is 70.62% Hg, 12.48%
Cl, and 16.9% O?
Answer:
Empirical Formula ClHgO3 Mercurous Chlorate
Explanation:
Cl=12.48% Hg=70.62% O=16.9%
Giving brainliest, please HELP!
Answer:
absorb
Explanation:
Endothermic reactions absorb energy ....usually feel cold
How might the ability of magnets to attract or repel other magnets relate to
the floating rings?
Answer:
Using magnets to repel each other is one way to try to achieve a frictionless bearing. In practice, it can be difficult to remove all friction. While a pair of magnets will repel each other, they are not stable in this condition. One magnet won't simply float forever above another magnet.
Explanation:
SCIENCE HELP MY COUSIN NEEDS HELP ILL GIVE BRAINLIEST FOR CORRECT ANSWER
Answer:
C
Explanation:
Releases Ink!
Answer: I'm pretty sure the squid releases a spray of ink
Explanation: I've seen it in movies
If you had 100 grams of wax(C25H52), predict...
1.how many grams of o2 would be needed to react with 100 grams of wax
2.How many CO2 would be produced?
3.How many grams of H2O would be produced?
Answer:
2 i think should be the correct answer
Explanation:
My cousin cant figure this out and neither me so maybe yall can help?
Answer:
I believe the Answer is B
i need help! what is the volume of a 2.0 m solution of an acid needed to neutralize a 3.0 m solution of a 250 ml base?
What mass of kool-aid is needed to make a 0.5-M solution from 100 mL?
Answer:
but purely citric acid synthetic Acid whose moller mass is equal to 192 g per mole. Okay, so here we have Modernity is even McGarity is equal to 0.5 M and we have volume, so Volume is equal to 200 mililiters is equal to 0.1 liter Okay, so they are asking to calculate the mass of what u have Okay. So first of all, if we want to calculate the mass of then we have to calculate the number of moles. So maturity is equal to the number of moles per volume in liters . So you mean zero point sorry from this one number of moles is equal to So N is equal to m multiplied very weak. So that is equal to 0.1 and 0.5. So that is equal to 0.05 moles. Okay, now the mask is equal to the mass of cool eh is equal to the number of Okay. Number of 0.5 and it is multiplied by 92 g per mole. Then it is equal to 9.6 g. So this is the mass of a present. A 0.500 ml
Why do bases dissociate in water?
They are polar
They are non polar
They are ionic bonded
They are covalent bonded
Answer:
because they are ionic bonded
please write the measure of this bat plsss
Answer:
10 + 3/4 = 10 3/4 units ( inches <==== I think)
Explanation:
PLEASE ANSWER! 5 STAR RATING - THANKS (PROFILE TOO) - BRAINLIEST IF 2 ANSWERS
A 14 V battery powers the headlights of a car. What is the resistance of the
headlights if they draw 3.0 A of current when turned on?
Answer: 9514 1404 393
4 2/3 ohms
The resistance is the ratio of voltage to current.
R = V/I
R = (14)/(3) = 4 2/3 . . . ohms
Explanation:hi ^^ have a great day hope this helps xlXCherryColaXlx (nice pfp btw)
A lion catches and eats a deer. What is this relationship ?
Answer:
this is a food chain in ecosystem
Answer:
this is a food chain in ecosystem
Explanation:
hope this helps
student A correctly describes a chemical equilibrium is “reactant favored” and student B also correctly describes the same equilibrium as “product favored”. Can this happen? If so how?
ANSWER ASAP!!
Classify the following type of stoichiometry problem: How many cubic centimeters of oxygen are produced from decomposing 5.00 mL of steam? (Sec.9.3)
(a) mass–mass problem
(b) mass–volume problem
(c) volume–volume problem
(d) mole–mole problem
(e) none of the above
Answer:
volume problem
Explanation:
cubic usually means volume
Whenever there is a change of state, such as solid to liquid or liquid to gas, heat energy can be added without a temperature change because
Answer:
The change of state requires energy.
Explanation:
Instead of the energy changing the temperature the heat energy is used by changing its form.
Detective Gundy found several areas in a warehouse where fires appeared to have started. What can he MOST likely conclude from this
evidence?
A Someone deliberately set fires at different points around the warehouse
B. Several people accidentally dropped lit cigarettes around the warehouse
OC Strong winds spread the fire throughout multiple areas in the warehouse,
D. There was no accelerant used to start any of these fires
Given what we know, we can confirm that based on the evidence found, someone deliberately set fires at different points around the warehouse.
Why do we think the fires were deliberate?This has to do with the natural way in which fires spread. Fires that occur naturally or accidentally tend to concentrate in one place, then spread throughout the warehouse over time, however, this is not what the detective found. Instead, there are indications that multiple fires started simultaneously.
Therefore, given the very unlikely nature of this occurring naturally, we can confirm that based on the evidence found, someone deliberately set fires at different points around the warehouse.
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Equation Given : Al^(3+) + Na3PO4 ==> 3Na^+ + AlPO4
Given that 61µg of aluminum phosphate precipitate formed, calculate the micromoles of aluminum ions in 50 mL of river water. (1µg = 1 x 10^(-6)g)
1 mols of Aluminium ion forms 1 mol aluminium phosphate
Molar mass of AlPO_4
27+31+16(4)58+48106uMoles of AlPO_4
61µg/1060.000061/1065.75×10^{-7}57.5µmolMoles of Al3+=57.5µmol
A gas collected from a reaction has a mass of 1.211 g and occupies a volume of 0.677 L. The temperature in the laboratory is 296 K, and the air pressure is 0.987 atm. Calculate the molar mass of the gas.
23.7 g/mol
44.0 g/mol
58.5 g/mol
82.3 g/mol
Answer: 44.0 g/mol
Explanation:
[tex]M=m.RT/PV[/tex]
M=1.211*0.082*296/ 0.987*0.677
M= 44 g/mol
A gas collected from a reaction has a mass of 1.211 g and occupies a volume of 0.677 L. The temperature in the laboratory is 296 K, and the air pressure is 0.987 atm the molar mass of the gas 23.7 g/mol. option A is correct.
What is gas law?The universal gas law given by Boyle, Charles , Avogadro and Gauss known as combined gas law with respect to temperature, volume and pressure using universal gas constant and number of moles.
According to universal gas equation or combined gas equation
P V = n R T
where , P = pressure
V = volume
n = number of moles
R = universal gas constant = 8.313
T = temperature
n = W / M.M
W = weight
M.M = molar mass
substituting the value in the equation
0.987 × 0.677 = 1.211 / M.M × 8.313 × 296
M.M = 23.7 g/mol
Therefore, gas collected from a reaction has a mass of 1.211 g and occupies a volume of 0.677 L. The temperature in the laboratory is 296 K, and the air pressure is 0.987 atm the molar mass of the gas 23.7 g/mol. option A is correct.
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Can someone please help me? :(
Answer:
C I think
Explanation:
A duck isn't supposed to bring a sandwich to people, so i believe that the duck learned how to do that. (Sorry if it's wrong)
Write symbol and ionic equations to show the reaction
between magnesium and oxygen to form magnesium
oxide
Answer:
2Mg + O2 ⇒ 2MgO
Question 19 of 25
Which of the following characteristics would make a gas non-ideal?
A. The gas molecules move in a random pattern.
B. The gas molecules possess kinetic energy.
C. The gas molecules interact with one another.
D. The gas molecules exert pressure on a container.
SUBMIT
Answer: the gas molecules interact with one another
Explanation:
According to the forces of attraction, the gas molecules interacting with one another makes a gas non - ideal.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Can someone please help me? :(
Answer:
Roots, stems and leaves
Explanation:
A, B, and D
Hope this helps!
Answer:
A, B y D
Explanation:
If the change in Gibbs free energy for a process is positive, the corresponding change in entropy for the universe will be
If the change in Gibbs free energy for a process is positive, the corresponding change in entropy for the universe will be positive.
What is Gibbs free energy?This is defined as the energy used by a substance involved in a chemical reaction.
The Gibbs free energy and entropy has a direct relationship which is why a positive gibbs free energy will result in a corresponding positive entropy.
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Answer: The correct answer is Negative
Write the balanced chemical equation for the extraction of iron in the thermite reaction.
2AI + Fe₂O3 = 2Fe + Al2 O3
From the above reaction, state the:
a) Electropositive metal -
b) Less electropositive metal -
c) Reducing agent -
In the given chemical reaction iron is less electropositive metal and aluminum is more electropositive and behave as a reducing agent also.
What is electropositivity?Electropositivity is the ability of an atom of donation or losing of electrons easily.
From the given chemical reaction it is clear that oxidation state of iron changes from +3 to 0 & of aluminum is from 0 to +3. So in the above chemical reaction aluminum is more electropositive than iron metal. And aluminum is behave as a reducing agent as it helps in the reduction process by providing electrons.
Hence aluminum is electropositive metal and reducing agent, iron is less electropositive.
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