Answer:
1.48×10²⁴ Cu atoms
Explanation:
For this question you need to use Avogadro's number 6.022×10²³atoms.
2.45 moles of Cu ×[tex]\frac{6.022x10x^{23} atoms }{1 mole}[/tex]= 1.47539×10²⁴ atoms.
The moles cancel out so you are left with atoms.
Since there are 3 significant figures in the question there should be 3 significant figures in your answer, which is 1.48×10²⁴ Cu atoms.
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 is primarily destroying the ozone layer of the atmosphere?.
Answer:
CFCs
Explanation:
When CFCs come into contact with sunlight, they divide into molecules. One of those molecules is chlorine, which destroys the ozone.
Please help witht 4 and 5
Answer:
#4: 0.89 mol/L #5: 0.36 mol
Explanation:
#4: Morality is Moles/ Liters
So take 3.2 mols ÷ 3.6 L = 0.8888... since there are 2 sig figs in the question the answer would round to 0.89 mol/L
#5: to find the number of moles needed, you take the mol/L and multiply that by the volume.
0.89 mol/L ×0.400L = 0.356 mols. the liters cancel out. Since 0.89 has the least number of sig figs your final answer should have 2. which it 0.36 mols.
I hope this helps, good luck!
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
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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The first time dicaprio heard about global warming, who told him that it was the most important issue of our time.
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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When referring to immunity, what does the term innate imply?
the mechanism will provide defense against many different types of pathogens
the mechanism will develop based upon exposure to specific pathogens
the mechanism will be built-in and present at birth
the mechanism will be acquired over an individual's lifetime
Answer:
The answer should be A. the mechanism will provide defense against many different types of pathogens :)
Have an amazing day!!
Please rate and mark brainliest!!
please write the measure of this bat plsss
Answer:
10 + 3/4 = 10 3/4 units ( inches <==== I think)
Explanation:
i need help for this pleeeeeeeeeezzzzzzzzzz
Answer:
A
Explanation:
did this before
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
Name one strength and weakness about your volcano expeirment.
Answer:
weakness, There are two conditions that lead to a weak volcanic eruption, low viscosity magma and little presence of trapped gases.
strength, The VEI or (Volcanic Explosivity Index) is a scale that describes the size of explosive volcanic eruptions based on magnitude and intensity. The numerical scale (from 0 to 8) is a logarithmic scale, and is generally analogous to the Richter and other magnitude scales for the size of earthquakes.
Explanation:
i really hope this helps. :)
Can someone please help me? :(
Answer:
D. Extremely high pressure
B. Unusally high oxygen Levels
Sorry about that
becasue there is not ice on the bottum of the ocean it is really hot and unever terran it becasue of big rock forming together they all ready figurd that out
Hope This Helps
Answer:
D and B
Explanation:
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
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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If 40.0 grams of HCI were dissolved in enough water to make a solution with a total volume of 3.0 liters, what would be the molarity of the solution?
Answer: 0.37 M
Explanation:
HCl has a gram-formula mass of 36.46 g/mol, so 40.0 g is about 40.0/36.46=1.10 mol.
This means that since molarity = (moles of solute)/(liters of solution), the answer is 1.10/3.0 = 0.37 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
Why can you calculate the total pressure of a mixture of gases by adding together the partial pres-
sures of the component gases?
Answer:
Dalton's law of partial pressure
Explanation:
In Dalton's law of partial pressure is states that the total pressure of a gas mixture is equal to the sum of the partial pressures of the component gasses.
This is the equation: [tex]P_{total} =P_{gas 1} +P_{gas2} + P_{gas3}[/tex].. so on and so forth.
basically what Dalton is saying partial pressures are just fractions of the total pressure, think of it as if you cut 12 slices of pizza and 12 people grabbed a slice of the pizza. Each person has 1/12 of that pizza, 1/12 x 12 = 1.
let's say there is a container filled with nitrogen gas (N) , hydrogen gas (H), and ammonia gas (NH₃).
N= 40 atm
H=20 atm
NH₃= 10 atm
you would plug this information into this equation: [tex]P_{total} =P_{gas 1} +P_{gas2} + P_{gas3}[/tex]
[tex]P_{N} + P_{H} + P_{NH{3}} = P_{total}[/tex]
[tex]P_{40} + P_{20} + P_{10} = 70[/tex]
N is 40/70 of the gaseous mixture.
H is 20/70 of the gaseous mixture.
NH₃ is 10/70 of the gaseous mixture.
if you add these fractions up:
[tex]\frac{40}{70} +\frac{20}{70} +\frac{10}{70} =\frac{1}{1} =1[/tex]
I really hope this helps a little!
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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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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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%
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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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
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
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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)
Briefly explain the source, harmful effects and physical properties of oxides of
nitrogen.
Answer:
Nitrogen reacts with oxygen to form a number of nitrogen oxides. It exhibits different oxidation states in its oxides, ranging from +1 to +5. Oxides of nitrogen having nitrogen in the higher oxidation state are more acidic than that in lower oxidation state. Nitrogen oxides are critical components of photochemical smog. They produce the yellowish-brown colour of the smog. In poorly ventilated situations, indoor domestic appliances such as gas stoves and gas or wood heaters can be significant sources of nitrogen oxides.
Following are the harmful effects caused by the oxides of nitrogen
Nitrogen oxides causes irritation in mucous membrane.
Large concentrations of Nitrogen oxide causes lungs problems in humans
It causes injuries to vegetation by damaging leaves.
Nitrogen oxide oxidizes Hydrocarbons in the presence of sunlight, which causes eye irritation, asthama attacks, nasal and throat infections.
NO: sharp, sweet-smelling, colourless gas. Melting point: -163.6°C. Boiling point: -151.8°C. Relative Density: 1.04 (air = 1) NO2: reddish-brown gas with irritating odour
4. A 14.5-L balloon is in the air where it is 20.0 C at 0.980-atm. A wind passes over and the balloon's pressure becomes 740.0-mmHg and its size adjusts to 14.3-L. What Celsius temperature was the wind?
The temperature of the wind as that decreases the volume and the pressure of the balloon to the given values is 14.09°C.
What is Combined gas law?Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
P₁V₁/T₁ = P₂V₂/T₂
Given the data in the question;
Initial volume V₁ = 14.5LInitial pressure P₁ = 0.980atmInitial temperature T₁ = 20.0°C = 293.15KFinal volume V₂ = 14.3LFinal pressure P₂ = 740.mmHg = 0.973684atmFinal temperature T₂ = ?We substitute our given values into the expression above.
P₁V₁/T₁ = P₂V₂/T₂
( 0.980atm × 14.5L )/293.15K = ( 0.973684atm × 14.3L )/T₂
14.21Latm / 293.15K = 13.92368Latm / T₂
14.21Latm × T₂ = 13.92368Latm × 293.15K
14.21Latm × T₂ = 4081.72679LatmK
T₂ = 4081.72679LatmK / 14.21Latm
T₂ = 287.24K
T₂ = 14.09°C
Therefore, the temperature of the wind as that decreases the volume and the pressure of the balloon to the given values is 14.09°C.
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What does radioactive mean
Answer:
emitting or relating to the emission of ionizing radiation or particles
Explanation:
Radiation can damage the DNA in our cells.
In other words!
the giving off of rays of energy or particles by the breaking apart of atoms of certain elements (as uranium)
In designing the experiment, the researchers used which type of 32p labeled atp?.
In designing the experiment, the researchers used Y32P-ATP.
What is ATP?Adenosine triphosphate (ATP) is an organic substance and a hydro-trope that provides energy for a variety of functions in
living cellsincluding muscular contractionnerve impulse propagationcondensate dissolvingand chemical synthesisResearchers used Y32P-ATP Because the Y-phosphate of ATP is used for phosphoryl transfer by kinases. As a result, Y32P-ATP is required for the experiment.
Hence the used ATP is Y32P-ATP.
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Giving brainliest, please HELP!
Answer:
absorb
Explanation:
Endothermic reactions absorb energy ....usually feel cold