Answer:4.5 ×10^22)
Explanation:
no. of particles =no. of mole×avogadro's number of particles no. of particles =0.75×6.02×10^23 no. of particles =4.5 ×10^22
At 25◦C a 4 L sample of H2 exerts a pressure of 5 atm. What pressure would the same sample exert in a 2 L container at 25◦C?
Answer:
10 atm.
Explanation:
Using the combined gas law equation as follows;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question,
P1 = 5 atm
P2 = ?
V1 = 4L
V2 = 2L
T1 = 25°C = 25 + 273 = 298K
T2 = 25°C = 298K
Using P1V1/T1 = P2V2/T2
5 × 4/298 = P2 × 2/298
20/298 = 2P2/298
Cross multiply
298 × 20 = 298 × 2P2
5960 = 596P2
P2 = 5960 ÷ 596
P2 = 10 atm.
Nitrogen dioxide (NO2) gas and liquid water (H20) react to form
aqueous nitric acid (HNO3) and nitrogen monoxide (NO) gas. Suppose you have 1.0 mol of NO, and 7.0 mol of H, 0
olle
Calculate the largest amount of HNO, that could be produced. Round your answer to the nearest 0.1 mol.
in a reactor.
Imo1
x
?
Behavioral therapy began with _______________.
A. Ivan Pavlov
B. B.F. Skinner
C. John Watson
D. Erik Erikson
Answer:
B
Explanation:
Behaviour therapy was popularized by the U.S. psychologist B.F. Skinner, who worked with mental patients in a Massachusetts state hospital.
iron and carbon:steel:copper and tin:___________
Answer:
iron and carbon:steel:copper and tin: metal
differentiate between hypothesis and Theory
Answer:
A
Explanation:
edge
What is the formula for the Ideal Gas Law and what does each variable represent?
Answer:
PV=nRT
Explanation:
P= Pressure
V= Volume
n= amount of substance (usually moles)
R= Ideal Gas Constant (8.314 J/mol*K
T= Temperature
briskly meaning
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What is concentration of hydrogen ion a given acid if its PH value is 9?
!!!PLEASE HELP!!!
3. If a convergent boundary involves a continental landmass and an ocean basin, what is the result?
A: A chain of volcanic mountains will form on the edge of the continent or just off shore, a deep
ocean trench will form off shore.
B: The land will fold and fault, forming high mountain ranges.
C: The land
at the edge of the continent will buckle, causing the formation of a trench.
D: There will be frequent earthquakes, but no other evidence of crustal movement.
Answer:
A
Explanation:
If a convergent boundary involves a continental landmass and an ocean basin, a subduction zone forms. Subduction occurs where a plate moves underneath the other.
Why does the spoon handle look broken where it enters the surface of the water?
Answer:
The spoon appears to be broken because of refraction. Refraction happens when light travels from one medium to another and changes speed and bends. This also causes objects to look different sizes and shapes when they are submerged in water.
Explanation:
To solve this, we must know the concept behind refraction. Therefore, due to refraction, the spoon handle look broken where it enters the surface of the water.
What is refraction?Refraction is the bending of a wave as it travels through different media. The two materials' different densities are what lead to the bending. Anytime a light beam enters a material with a differing refractive index at an angle, it refracts. This increase in speed causes a shift in direction.
Due of refraction, the spoon seems to be shattered. When light moves from one medium to another, its speed and direction shift, causing refraction. When items are submerged in water, this also makes them appear to be of varied sizes and forms.
Therefore, due to refraction, the spoon handle look broken where it enters the surface of the water.
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How many sugar molecules are present in 300 mL of a 2.0 M solution? (The formula for sugar is C12H22O11) AND ADD STEPS PLEASE
Answer: 3.6 x 1023 molecules and 0.143 Litres
SHOW WORK
A sample of gas at 62.0°C occupies a volume of 4.80 L at a pressure of 2.90 atm. How many moles of gas are contained in the sample?
A sample of gas at 62.0°C occupies a volume of 4.80 L at a pressure of 2.90 atm. 0.506 moles of gas are contained in the sample.
What is mole?Inside the World System of Units, the mole is indeed the unit of substance amount (SI). How many fundamental entities of a particular substance are present in an object and sample is determined by the quantity of that material. There are precisely 6.022×10²³ elementary entities in a mole.
An elementary entity can be an atoms, a molecule, an ion, and ion pair, or a fundamental particle like an electron depending upon what the substance is. For instance, although having differing volumes and masses, 10 moles liquid water as well as ten moles of mercury both contain the same quantity of material, as well as the mercury includes exactly one atom with each molecule of water.
PV = nRT
n = PV/RT
P = 2.90 atm
V = 4.80 L
R = 0.08206 L atm / mol K
T = 62.0 + 273 = 335 K
n = (2.90 •4.80) / (0.08206 • 335)
= 0.506 moles of gas
Therefore, 0.506 moles of gas are contained in the sample.
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SOMEONE hELP ASAP
Which of the following statements about humans and biodiversity are TRUE?
Choose all that apply:
Humans benefit from biodiversity as a source of food, medicine, and raw materials.
Biodiverse ecosystems provide benefits to humans, such as cleaning water or pollination of crops.
Humans benefit from biodiversity but do not rely on biodiversity. Any natural materials that run out can be replaced by synthetic materials.
Humans are not affected by loss of biodiversity.
Answer:
Iiiiiiddddddkkkkkkkkkk
Explanation:
Answer:
second onw\e
Explanation:
Help!!!
Is KOH soluble or insoluble in water?
Insoluble
Soluble
Answer: yes, it's soluble in water.
Which equation is correctly balanced?
A) CaO + 2H2O + Ca(OH)2
B) NH3 + 202 → HNO3 + H20
C) Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 3H2O
D) Cu + H2SO4 → CuSO4 + H2O + SO2
CaO + 2H2O + Ca(OH)2 is a balance chemical equation. Therefore, option A is correct.
What is balance chemical equation ?A balanced chemical equation is one that has the same number of atoms of each type in the reaction on both the reactant and product sides. In a balanced chemical equation, both the mass and the change are equal.
When a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants, according to the law of conservation of mass. As a result, the number of atoms in each element remains constant during the chemical reaction. As a result, the chemical equation must be corrected.
The chemical equation is said to be balanced if there are no inequalities. Every element in this example now has an equal number of atoms on both the reactant and product sides.
Thus, option A is correct.
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help!! help!! help!! help!! help!! help!! help!! help!! help!! explain the bond formation of ocl2 molecule
Answer:
it is formed by covalent bonds. the oxygen atom shares one elctron with each chlorine atom, forming single covalent bonds ( cl — o — cl )
A population of mice, some with light-colored fur and some with dark-colored fur are introduced into a field with dark soil. A few generations later, the majority of the mice have dark-colored fur. Which of the following best explains this change? *
Light-colored mice can run faster.
Dark-colored mice have fewer offspring.
Light-colored mice have changed color over generations.
Dark-colored mice are better able to hide from their predators.
Answer:
Dark-colored mice are better able to hide from predators.
Explanation:
If all of the light mice are eaten, then there are none left to pass on the light-furred gene, meaning that there would be no offspring without dark fur.
The correct option for the given question about Evolution is Option D) "Dark coloured mice are better able to hide from their predators".
What is the Theory of Darwin?
"Survival of the fittest" is explained in the Darwin theory.
It is identical to natural selection. You are regarded as one of the "fittest" if you possess the greatest features or are "fit" enough to live and adapt to your surroundings. However, the ability to reproduce is just as important as simply surviving. You are successful if you can survive and reproduce.
Thus we can conclude that Dark coloured mice are better able to hide from their predators and hence they also satisfies the theory of Darwin "The survival of the fittest" hence this is the reason why after few generation the majority of the mice have dark coloured fur.
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Which statement correctly describes the relationship between air temperature and air pressure?
-Warm air rises, creating an area of low pressure.
-Cool air sinks, creating an area of low pressure.
-Warm air sinks, creating an area of low pressure.
-Cool air rises, creating an area of low pressure.
Answer:
-Warm air sinks, creating an area of low pressure.
Explanation:
Heat will weigh more, than cool air!
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HELP !!! urgent
which one is oxidized ?
lead (II) oxide + carbon monoxide= lead + carbon dioxide
Answer:
carbon monoxide (CO)
Explanation:
carbon monoxide (CO) is oxidized because it gains oxygen to turn to carbon dioxide (CO2)
Which of the following statements is true about the molecule shown below?
Answer:
B. The bonds are polar and the molecule is nonpolar.
Explanation:
Each bond in the molecule is polar, as indicated by the partial charges on the atoms of the molecule. However, the four atoms are arranged symmetrically around the central atom. In this case, the effects of the partial charges on opposite sides cancel out. As a result, the molecule as a whole is nonpolar. If exposed to an electric field, the molecule will not orient itself in any particular direction.
I’ll mark BRAINLIEST! Please help!
Answer:
theirs nothing there?!!!??!?!?!??!!?!?!?!?!??!?!??!?!?!??!?!
Explanation:
whys it just a blank picture
How many moles of sulfuric acid (H2SO4) are present in 500.0 mL of 0.15 M H2SO4 solution?
Answer:
Number of moles = 0.075 mol
Explanation:
Volume = 500.0 mL = 0.5 (Converting to L by dividing by 1000)
Molarity = 0.15 M
Number of moles = ?
The relationship between the quantities is given as;
Molarity = Number of moles / Volume
Number of moles = Molarity * Volume
Number of moles = 0.15 * 0.5
Number of moles = 0.075 mol
Pleseee help me pretty please ✨
Answer:
6 N.
Every thing has equal and opposite reaction.
Answer:
The answer is C I believe, I do not know for sure but I think that is the answer..
I'm sorry if I'm wrong.
Explanation:
5g of NaOH was dissolved in 1000cm3. 25cm3 of this solution neutralized 28.3cm3 of solution containing 7.2gdm-3 of impure H2SO4. Calculate I. The molarity of H2SO4 II. The concentration of the pure acid on gdm-3 III. % impurity of the acid
Explanation:
The balanced equation for the reaction between NaOH and H2SO4 is given as;
2NaOH + H2SO4 → Na2SO4 + 2H2O
2 mol of NaOH reacts with 1 mol of H2SO4
5g of NaOH was dissolved in 1000cm3.
Mass = 5 g
Molar mass = 40 g/mol
Volume = 1000 cm3 = 1 L
Number of moles = Mass / Molar mass
Number of moles = 5 / 40 = 0.125 mol
Molarity = Number of moles / Volume
Molarity = 0.125 / 1 = 0.125 M
25cm3 of this solution neutralized 28.3cm3 of solution containing 7.2gdm-3 of impure H2SO4.
CaVa / CbVb = Na / Nb ; where a = acid and b = base
Va = 28.3cm3
Vb = 25cm3
Ca = ?
Cb = 0.125 M
Na = 1
Nb = 2
I. The molarity of H2SO4
Solving for Ca;
Ca = CbVb * Na / (Va * Nb)
Cb = (0.125 * 25 * 1 ) / ( 28.3 * 2)
Cb = 0.0552 M
II. The concentration of the pure acid on gdm-3
Molarity = Mass conc / Molar mass
Mass Conc = Molarity * Molar mass
Mass Conc = 0.0552 * 98.079
Mass Conc = 5.41 g/dm3
III. % impurity of the acid
Percentage Impurity = Mass of pure / Mass of Impure * 100
Percentage Impurity = 5..41 / 7.2 * 100
Percentage Impurity = 75.14%
SCIENCE QUEASTION I PUTED IT IN CHEMISTRY BECAUSE BRAINLY HAS NO SCIENCE WILL MARK BRAINLIEST DONT POST LINKS OR ELSE REPORTED
Pls Help With these 2
#1 Which description most accurately describes what weather is?
The long term average of temperatures at a location
or
The condition of the atmosphere at a certain time and certain place
#2 When air reaches 100% relative humidity or the point of saturation, what does that mean? *
The rate of evaporation is GREATER THAN the rate of condensation
or
The rate of evaporation is EQUAL to the rate of condensation
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Gave you the answers already but anyways good luck, do well :)
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answer:
millions of animals..
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12.0 g NaHSO4 (MM: 120.1 g/mol) is dissolved in water to make a 2.00 L solution. What is the molarity of the resulting NaHSO4 solution?
Answer:
0.05 M
Explanation:
First we convert 12 g of NaHSO₄ into moles, using the given molar mass:
12 g NaHSO₄ ÷ 120.1 g/mol = 0.10 mol NaHSO₄We can now calculate the molarity of the resulting solution, using the calculated number of moles and the given volume:
Molarity = moles / litersMolarity = 0.10 mol / 2.00 L = 0.05 MAnswer:
The molarity of the resulting NaHSO₄ solution is 0.05 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molar mass is the amount of mass that a substance contains in one mole. Being the molar mass of the compound NaHSO₄ equal to 120.1 g/mole, then the number of moles that 12 grams contain is calculated by:
[tex]12 g*\frac{1 mole}{120.1 g} = 0.1 moles[/tex]
And being 2 L the volume of the solution, then replacing in the definition of molarity you get:
[tex]Molarity=\frac{0.1 moles}{2 L}[/tex]
Molarity= 0.05 [tex]\frac{moles}{liter}[/tex]
The molarity of the resulting NaHSO₄ solution is 0.05 [tex]\frac{moles}{liter}[/tex]
How many liters of Carbon Tetra Oxide gas in 152.0 grams?
Answer:
Hello
so ur answer is
56.74L
Explanation:
thanks... hope it helps
potassium hydroxide , sodium chloride, sodium hydroxide ,calcium chloride , sodium bicarbonate write molecular formula
✧ [tex] \underline{ \underline{ \large{ \tt{A \: N \:S \: W \: E \: R}}}} : [/tex]
[tex] \underline{ \underline{ \large{ \text{Molecular \: Formulaes}}}} : [/tex]
⇾ [tex] \large{ \text{Potassium \: Hydroxide : K \: OH}}[/tex]
⇾ [tex] \large{ \text{Sodium \: Chloride : NaCl}}[/tex]
⇾ [tex] \large{ \text{Sodium \: Hydroxide : NaOH}}[/tex]
⇾ [tex] \large{ \text{Calcium \: Chloride : CaCl}}[/tex]
⇾ [tex] \large{ \text{Sodium \: Bicarbonate} : \tt{Na ( HCO)_{ 3} }}[/tex]
---------------------------------------------------------
☥ [tex] \underline{ \underline{ \large{ \tt{ \: E \: X\: P \: L\: A\: N \: A \: T \: I \: O \: N}}} }: [/tex]
[tex] \underline{ \underline{ \text{Writing \: a \: molecular \: formula}}} : [/tex]
To write a molecular formula , the following steps are usually adopted only when we know the symbol and valencies of elements and radicals present in a molecule.
Step 1 : First , the name of the compound is written.
Step 2 : The symbols of basic and acidic radicals are written side by side.
Step 3 : The valency of each radical is written at the right upper corner of the symbol. The valency of one radical is transferred to another radical and it is written on the right hand side at the bottom corner. If necessary , L.C.M of the valencies us taken to get a simple whole number.
Step 4 : If a compound radical takes part in the molecular formula , the radical is enclosed in brackets and the valency number is written on the right side of the bracket at the bottom of the formula.
For instance :
[tex] \text{Calcium \: \: \: \: \: \: Sulphate}[/tex] [ compound ]
1. [tex] \sf{Ca \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: SO_{4} }[/tex] [ Symbol of basic and acidic radicals ]
2.We know : Valencies of calcium and sulphate are 2 and 2 respectively
3. [tex] \sf{Ca_{2} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: (SO_{4} )_{2} }[/tex] [ Valencies are exchanged and compound radical is enclosed in bracket ]
4.[tex] \sf{CaSO_{4}}[/tex] [ L.C.M is taken to get molecular formula of calcium sulphate ]
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