Ammonium nitrite undergoes decomposition to produce only gases as shown below. nh4no2(s) → n2(g) + 2h2o(g) how many liters of gas will be produced by the decomposition of 32.0 g of nh4no2 at 525°c and 1.5 atm?

Answers

Answer 1
From the given balanced reaction equation:

we can see that every 1 mole of NH4NO2 will produce 1 mole of N2 and when the water also on the gas phase so, every 1 mole of NH4NO2 will produce 3 moles of gas

now we need to get number of moles of NH4NO2  = mass/molar mass
when the mass = 32 g and the molar mass of NH4NO2 = 64 mol/g

∴moles of NH4NO2 = 32 g / 64 mol/g = 0.5 mole

so, the moles that produced of gas will be = 3 * 0.5 = 1.5 moles

now, we can use the ideal gas formula to get V:

PV = nRT

when P is the pressure = 1.5 atm

n is the number of moles = 1.5 moles 

R is the ideal gas constant = 0.0821 L*atm/mol*K

and T is the temperature in Kelvin = 525 °C + 273 = 798 K

so by substitution:

1.5 atm * V = 1.5 moles * 0.0821 * 798 K

∴ V = 65.5 L
Answer 2
Final answer:

Approximately 32.77 liters of gas will be produced by the decomposition of 32.0 g of NH4NO2 at 525°c and 1.5 atm.

Explanation:

Decomposition of 32.0g of NH₄NO₂ can be calculated by using the Ideal Gas Law PV=nRT where P is the pressure, V is the volume, n number of moles, R the gas constant and T temperature. Given the molar mass of  NH₄NO₂ is about 64.04 g/mol, we divide 32.0g by 64.04 g/mol to get 0.5 moles of NH₄NO₂  The reaction of NH₄NO₂ decomposing to N₂ and H₂O shows that for every 1 mole of NH₄NO₂ , 1 mole of N₂ and 2 moles of H2O are produced. Thus, in total, by decomposing 0.5 moles of  NH₄NO₂  we produce 0.5 * 3 = 1.5 moles of gases at 525 °C and 1.5 atm.

Applying these values into the Ideal Gas Law, substituting R for the value of 0.0821 (when pressure is in atm, volume in L, and T in kelvin), and noting that 525°C is equivalent to 798.15 K (273.15 + 525 = 798.15), we get V = (1.5*0.0821*798.15)/1.5. By solving this, we get the volume of gasses to be approximately 32.77 liters.

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Related Questions

How many different isomers can be derived from ethylene if two hydrogen atoms are replaced by a fl uorine atom and a chlorine atom? draw their structures and name them. indicate which are structural isomers and which are geometric isomers?

Answers

Answer:
             THREE different isomers can be derived from ethylene if two hydrogen atoms are replaced by a fl uorine atom and a chlorine atom.

Explanation:
                   When two Hydrogen atoms in ethylene (C₂H₄) are replaced with Fluorine and Chlorine atom then the new molecular formula is C₂H₂FCl.
                    Compounds having same Molecular formula but different structural formula are called as Isomers.
                     First Isomer of C₂H₂FCl is 1-chloro-1-fluoroethene, in which F and Cl at geminal position (attached to same Carbon atom).
                     Other two Isomers are Geometrical Isomers of 1-chloro-2-fluoroethene, in which F and Cl at different carbon atom and having different position is space. The one in which both F and Cl at opposite side forms (trans)-1-chloro-2-fluoroethene and the one in which both are in same side is called as (cis)-1-chloro-2-fluoroethene.

Which of the following classes of organic compounds has COOH as the functional group

Alkane
Carboxylic acid
Aldehyde
Ether

Answers

-COOH as the functional group has class of carboxylic acids.

Carboxylic acid is an organic compound that has COOH as the functional group.

What are functional groups?

Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.

The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.

Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.

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What type of bond would occur between carbon (C) and nitrogen (N)?
A. Metallic bond
B. Ionic bond
C. Paired bond
D. Covalent bond

Answers

Nitrogen and carbon are nonmetals , so D. Covalent bond

What volume does 43.5 g of n2 occupy at stp? (r = 0.08206 l⋅atm/mol⋅k)?

Answers

Answer is: volume of nitrogen is 34.72 liters.
m(N₂) = 43.5 g.
n(N₂) = m(N₂) ÷ M(N₂).
n(N₂) = 43.5 g ÷ 28 g/mol.
n(N₂) = 1.55 mol, amount of substance.
T = 273 K, standard temperature.
p = 1 atm, standard pressure.
R = 0.08206 L·atm/mol·K, universal gas constant.
Ideal gas law: p·V = n·R·T.

V = n·R·T / p.
V(N₂) = 1.55 mol · 0.08206 L·atm/mol·K · 273 K / 1.00 atm.
V(O₂) = 34.72 L.

we are going to use this formula:

PV= n RT

when at STP

p is the pressure = 1 atm

and n is the moles = mass /molar mass = 43.5 g /28g/mol

                                                                  = 1.56 moles

R is the ideal gas constant = 0.0821 

and T is a temperature in Kelvin = 273 K

by substitution, we will get V (the volume)

1 atm *  V = 1.56 moles* 0.0821 *273K

∴ V = 34.96 L

This tea kettle shows a change in the state of matter of water. Which part of the water cycle represents the same change in state?

Answers

Puddled water freezes to form ice.

Answer:

The answer to the question you asked, "This tea kettle shows a change in the state of matter of water. Which part of the water cycle represents the same change in state?", is D. Lake water evaporates into the atmosphere.

Explanation:

The process of evaporation refers to the changing state of water from liquid to gaseous (vapor) state.

In the given condition, a tea kettle is placed, where the water evaporates due to the increased amount of heat provided to it. This allows the water to evaporate into the atmosphere forming water vapor.

One of the cases that shows a similar changing state of water is the evaporation of the lake water due to the high absorption of solar energy, that releases water vapor into the atmosphere.

Thus, the correct answer is option (D).

Why is the molar solubility of silver chloride lower in an aqueous solution of silver nitrate than in pure water?

Answers

Answer is: because silver cations are common ions in both chemical dissociation in water for this salts, so silver cations shift dissociation od silver chloride to the ledt according Le Chatelier's principle.
Chemical reaction (dissociation) of silver chloride in water:
AgCl(s) → Ag⁺(aq) + NO₃⁻(aq).
Chemical reaction (dissociation) pf silver nitrate in water:
AgNO₃ → Ag⁺(aq) + NO₃⁻(aq).

PLEASE HELP NOW!!!!!!!
What is the number of moles hydrogen produced when 6 moles of sodium are used?

2Na + 2H2O -> 2NaOH + H2

Answers

the  number of moles hydrogen produced when 6 moles of sodium are used is calculated  as below

2Na + 2H2O = 2NaOH  +H2

by use of mole ratio between Na to H2 which is 2:1 the moles of H2 is therefore

= 6 x1/2 = 3  moles of H2

A 50.0-ml volume of 0.15 m hbr is titrated with 0.25 m koh. calculate the ph after the addition of 14.0 ml of koh. express your answer numerically.

Answers

Final answer:

To find the pH after adding 14.0 mL of 0.25 M KOH to 50.0 mL of 0.15 M HBr, calculate the excess HBr and then use its concentration to determine the pH, assuming HBr dissociates completely as it's a strong acid.

Explanation:

To calculate the pH after the addition of 14.0 mL of 0.25 M KOH to 50.0 mL of 0.15 M HBr, we first need to determine if the reaction has reached the equivalence point. The millimoles of HBr initially present are calculated by multiplying the volume in liters by the molarity: 50.0 mL x 0.15 M = 7.5 mmol. Then, calculate the millimoles of KOH added: 14.0 mL x 0.25 M = 3.5 mmol.

Since we have more HBr than KOH, HBr is in excess and KOH is the limiting reactant. The excess amount of HBr is 7.5 mmol - 3.5 mmol = 4.0 mmol. The pH is determined by the concentration of the remaining HBr. To find this concentration, we take the remaining mmol of acid and divide by the total volume of the solution in liters (original acid solution plus the volume of KOH added).

The total volume after the addition of KOH is 50.0 mL + 14.0 mL = 64.0 mL or 0.064 L. The concentration of HBr is 4.0 mmol / 0.064 L. Now, convert mmol to mol by dividing by 1000, resulting in 4.0 x 10-3 mol / 0.064 L. Since HBr is a strong acid, it dissociates completely in water. The pH can be calculated using the formula pH = -log[H+], where [H+] is the concentration of hydronium ions, which is equal to the concentration of HBr.

Therefore, the pH is -log(4.0 x 10-3 / 0.064 L). Calculate this value to get the pH of the solution after the addition of 14.0 mL of KOH.

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Ethyl acetate is a sweet-smelling solvent used in varnishes and fingernail polish remover. it is produced industrially by heating acetic acid and ethanol together in the presence of sulfuric acid, which is added to speed up the reaction. the ethyl acetate is distilled off as it is formed. the equation for the process is as follows.

Answers

Final answer:

Ethyl acetate is a solvent used in varnishes and nail polish remover, and it is produced by heating acetic acid and ethanol in the presence of sulfuric acid. It is also used to extract caffeine from coffee and to remove nail polish and paint.

Explanation:

Ethyl acetate is a sweet-smelling solvent used in varnishes and fingernail polish remover. It is produced industrially by heating acetic acid and ethanol together in the presence of sulfuric acid, which is added to speed up the reaction. The ethyl acetate is distilled off as it is formed.

Ethyl acetate (CH, CO₂C₂H5) is the solvent in many fingernail polish removers and is used to decaffeinate coffee beans and tea leaves. It is prepared by reacting ethanol (C₂H5OH) with acetic acid (CH₂CO₂H); the other product is water. A small amount of sulfuric acid is used to accelerate the reaction, but the sulfuric acid is not consumed and does not appear in the balanced chemical equation.

Esters are common solvents. Ethyl acetate is used to extract organic solutes from aqueous solutions-for example, to remove caffeine from coffee. It also is used to remove nail polish and paint.

An excited state of a particular atom has a mean lifetime of 6.2×10−10 s , which we may take as the uncertainty δt.

Answers

According to Heisenberg's Uncertainty Principle,
ΔE×Δt ≥  h/(4π)
where h = planck's constant = 6.63 × [tex] 10^{-34} [/tex] J.s

Hence, ΔE ≥ [tex] \frac{h}{4.pi.delta(t)} [/tex] = [tex] \frac{6.63X 10^{-34} }{4X3.142X6.2X 10^{-10}} [/tex]
∴, ΔE ≥ 8.5086 X [tex] 10^{-26} [/tex] J
 

The osmotic pressure of a solution formed by dissolving 45.0 mg of aspirin (c9h8o4) in enough water to make 0.250 l of solution at 25°c is ________ atm

Answers

Answer is: osmotic pressure of aspirin is 0.025 atm.
m(C₉H₈O₄) = 45.0 ÷ 1000 mg/g = 0.045 g.
n(C₉H₈O₄) = m(C₉H₈O₄) ÷ M(C₉H₈O₄).
n(C₉H₈O₄) = 0.045 g ÷ 180 g/mol.
n(C₉H₈O₄) = 0.00025 mol.
c(C₉H₈O₄) = n(C₉H₈O₄) ÷ V(solution).
c(C₉H₈O₄) = 0.00025 mol ÷ 0.25 L.
c(C₉H₈O₄) = 0.001 M.
T = 25°C = 298.15 K.
R = 0.08206 L·atm/mol·K, universal gas constant.
p = c · R · T.
p = 0.001 mol/L · 0.08206 L·atm/mol·K · 298.15 K.
p = 0.025 atm.
 
Final answer:

The osmotic pressure of the solution can be calculated using the formula Π = MRT. First, convert the mass of aspirin to moles, then calculate the molarity by dividing the moles by the volume. Finally, calculate the osmotic pressure using the molarity, ideal gas constant, and temperature.

Explanation:

The osmotic pressure of a solution can be calculated using the formula:

Π = MRT

Where Π is the osmotic pressure, M is the molarity of the solution, R is the ideal gas constant, and T is the temperature in Kelvin.

In this case, we are given the mass of aspirin and need to calculate the molarity to determine the osmotic pressure.

First, we need to convert the mass of aspirin to moles:

45.0 mg x (1 g/1000 mg) x (1 mol/180.16 g) = 0.000249 mol

Next, we need to calculate the molarity:

M = moles/volume = 0.000249 mol/0.250 L = 0.000996 M

Finally, we can calculate the osmotic pressure:

Π = (0.000996 M)(0.0821 L. atm/mol. K)(298 K) = 0.0246 atm

A compound contains 46.7% nitrogen and 53.3% oxygen by mass. What is the empirical formula of the compound?

Answers

The empirical   formula  of a compound that contain 46.7 % nitrogen and 53.3% oxygen is calculated as below

find the moles of each element
that is , mole =% composition/molar mass
nitrogen (N)=46.7 / 14=3.33 moles

oxygen (O)=53.3 / 16 = 3.33 moles

divide each  mole  with the  smallest  number of mole to  get the mole ratio that is 3.33 moles


nitrogen (N) = 3.33/3.33 = 1
oxygen(O) = 3.33/3.33 =1

therefore the empirical formula = NO

What is the lowest possible value of n for a d atomic orbital?

Answers

Answer is: the lowest possible value of n is 3, that is 3d atomic orbital.
The principal quantum number (n) is one of four quantum numbers which are assigned to each electron in an atom to describe that electron's state.
The principal quantum number shows the most probable distance of the electrons from the nucleus.
For n=3, there are 3 orbitals: 3s, 3p and 3d.

Where do water and hydrochloric acid (hcl) lie on the ph scale in relation to each other?

Answers

Water has a neutral pH of 7 on the pH scale, while hydrochloric acid is a strong acid with a pH of around 1 to 2, indicating a much higher level of acidity than water.

On the pH scale, water and hydrochloric acid (HCl) lie at different points reflecting their levels of acidity. Water is neutral with a pH of 7, serving as the midpoint of the pH scale.

In contrast, hydrochloric acid is a strong acid with a pH significantly lower than 7; typically around 1 to 2 due to its high concentration of hydronium ions. The lower the pH value, the more acidic the substance is. Hence, hydrochloric acid has a much higher acidity than water.

In an ionic bond:
A. The atoms swap electrons.
B. Both atoms share their electrons.
C. The atoms attract each other but their electrons do not interact.
D. One atom accepts electrons from another.

Answers

Correct answer is 
D. One atom accepts electrons from another.

Answer:

One atom accepts electrons from another.

Explanation:

Answer via Educere/ Founder's Education

write the proper word equation to express the following chemical reaction: 3Li (s) + AuCI3 (aq) -> 3LiCI (aq) + Au(s)

Answers

word equation -
3 mol of solid lithium reacts with 1 mol of aqueous gold trichloride to form 3 mol of aqueous lithium chloride and 1 mol of solid gold.
this is a single displacement reaction.
Li is placed above Au in the reactivity series. Therefore Li is more reactive than Au. Since Li is more reactive than Au it can displace Au from the compound AuCl₃. 
Therefore its called a single displacement since Li displaces Au from its compound and takes the place of Au and make a new compound AuCl₃.

When the hydroxyl group, like in the image below, is attached to a carbon compound, the organic compound is a(n)

A hydrogen atom covalently bonded to an oxygen atom, which is covalently bonded to a carbon in the carbon chain.

carboxylic acid.
alcohol.
ether.
ketone.

Answers

Answer:
            The organic compound is an Alcohol.

Explanation:
                   Alcohol are class of organic compounds which are derived from water molecule. When one hydrogen atom in water molecule is replaced by an alkyl group it forms alcohols. i.e.

                           H-O-H  +  R    →    R-O-H  +  H

In above equation, R-O-H is the general formula of alcohols.

Examples:
                 CH₃-O-H    Methanol

                 CH₃-CH₂-O-H     Ethanol

                 CH₃-CH₂-CH₂-O-H     Propanol

                 CH₃-CH₂-CH₂-CH₂-O-H      Butanol

                 CH₃-CH₂-CH₂-CH₂-CH₂-O-H      Pentanol

Which two layers of Earth are mainly composed of metallic elements such as nickel and iron, which are abundant in meteoroids and comets?

Answers

This layer of the earth lies between the mantle and the solid inner core. It is the only liquid layer, a sea of mostly iron and nickel about 1,400 miles. The lava is mostly made up of iron and nickel. The outer core creates the Earth's magnetic field. The final layer is the inner core, which is 900 miles deep. Scientists believe the inner core is a solid ball of iron and other minerals.

This layer of the earth lies between the mantle and the solid inner core. It is the only liquid layer, a sea of mostly iron and nickel about 1,400 miles. The lava is mostly made up of iron and nickel. The outer core creates the Earth's magnetic field. The final layer is the inner core, which is 900 miles deep. Scientists believe the inner core is a solid ball of iron and other minerals.

Which one of the following compounds is not covalent?

A. HCI
B. S2CI2
C. KCI
D. SCI2


(P.S. The answer turned out to be C. KCI)

Answers

KCI is not a covalent compound, it is an ionic compound. 
A covalent compound is one in which each of the atoms involved contribute a specific number of electrons for sharing in order to from stable compound while an ionic compound is a compound formed when one atom donates electron to the other atom in the compound, in order to attain stability.  The compounds given in options A, B and D shared electrons while in KCl, potassium donates an electron to chlorine.

Answer:

KCl

Explanation:

Hello,

Potassium chloride is well-known as an ionic compound owing to the shown-below greater-than-1.7 difference between the electronegativities of potassium and chlorine:

[tex]\Delta E=E_{Cl}-E_K=3.16-0.82\\\Delta E=2.34[/tex]

This is by cause of the fact that such compounds that have a difference in the constituent elements' electronegativities greater than 1.7 are considered as ionic.

Best regards.

A 100.0 ml sample of 0.10 m ca(oh)2 is titrated with 0.10 m hbr. determine the ph of the solution after the addition of 400.0 ml hbr. the chemical equation is below. ca(oh)2 (aq) + 2hbr (aq) → cabr2 (aq) + h20 (l)

Answers

the balanced equation for the reaction is as follows;
Ca(OH)₂ + 2HBr --> CaBr₂ + 2H₂O
stoichiometry of Ca(OH)₂ to HBr is 1:2
number of Ca(OH)₂ moles reacted - 0.10 mol/L x 0.1000 L = 0.010 mol
Number of HBr moles added - 0.10 mol/L x 0.4000 = 0.040 mol 
1 mol of Ca(OH)₂ needs 2 mol of HBr for neutralisation
therefore 0.010 mol of Ca(OH)₂  needs - 0.010 x 2 = 0.020 mol of HBr to be neutralised
but 0.040 mol of HBr has been added therefore number of moles of HBr in excess - 0.040 - 0.020 = 0.020 mol 
then pH of the medium can be calculated using the excess H⁺ ions
HBr is a strong acid therefore complete ionization
[HBr] = [H⁺]
[H⁺] = 0.020 mol / (100.0 + 400.0 mL)
      = 0.020 mol / 0.5 L 
      = 0.040 mol/L
pH = -log[H⁺] 
pH = - log [0.040 M]
pH = 1.40
pH of the medium is 1.40

Calculate the energy transferred in joules when 29.5g of liquid water decreases from 14c to 0.0c

Answers

The  energy transferred  in joules  is   calculated  using the below  formula

Q(heat energy) =  M(mass)  x C (specific  heat capacity )  x  delta T(change  in  temperature
delta T =  0. 0c-  14 c  =  -14 c
M= 29.5 g
C of  water is always =  4.18  j/g/c

= 29.5 g x  -14 c x 4.18 j/g/c =-1726.34  joules are  needed when  29.5 g  of  liquid  water  decrease  from  14 c  to  0.0  C

What volume of so2 is produced at 325 k and 1.35 atm when 15.0 grams of hcl reacts with excess k2so3?

Answers

the balanced equation for the above reaction is as follows;
2HCl + K₂SO₃ ---> 2KCl + H₂O + SO₂
stoichiometry of HCl to SO₂ is 2:1
number of moles of HCl reacted - 15.0 g / 36.5 g/mol = 0.411 mol 
according to molar ratio 
number of SO₂ moles formed - 0.411 mol /2 = 0.206 mol
since we know the number of moles we can find volume using ideal gas law equation 
PV = nRT
where
 P - pressure - 1.35 atm x 101 325 Pa/atm = 136 789 Pa 
V - volume 
n - number of moles - 0.206 mol 
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 325 K
substituting values in the equation 

136 789 Pa x V = 0.206 mol x 8.314 Jmol⁻¹K⁻¹ x 325 K 
V = 4.07 L 
volume of SO₂ formed is 4.07 L


Final answer:

First, the balanced chemical reaction between HCl and K2SO3 is figured out. Then, using the molar mass of HCl, the number of moles are calculated. Finally, using the ideal gas law, the volume of SO2 produced is calculated as around 5.61 litres.

Explanation:

First, we need to figure out the balanced chemical reaction. The reaction of HCl with K2SO3 produces KCl, H2O, and SO2. The balanced reaction equation would look like this: 2HCl + K2SO3 -> 2KCl + H2O + SO2.

Next, we need to find out how many moles of HCl we have. 15.0 grams of HCl is around 0.411 moles (since molar mass of HCl is approximately 36.46 g/mol). According to the balanced reaction, for every 2 moles of HCl, we get 1 mole of SO2. Hence, our 0.411 moles of HCl would produce around 0.205 moles of SO2.

Finally, to find the volume of SO2 produced we can use the ideal gas law: PV=nRT. Given: Pressure(P) = 1.35 atm, Gas constant(R) = 0.0821 L.atm/(mol.K), Temperature(T) = 325K. By substituting these values in the ideal gas law, we get the volume (V) as 5.61 Litres.

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Calcium carbonate reacts with hydrobromic acid to form calcium bromide, carbon dioxide, and water according to the reaction below. what is the molarity of the hydrobromic acid if 250.0 ml of it reacts with 5.64 grams of calcium carbonate?

Answers

the balanced equation for the above reaction is as follows
CaCO₃ + 2HBr ---> CaBr₂ + CO₂ + H₂O
stoichiometry of CaCO₃ to HBr is 1:2
number of moles of CaCO₃ reacted - 5.64 g / 100 g/mol = 0.0564 mol 
according to molar ratio
number of HBr moles - 0.0564 mol x 2 = 0.1128 mol 
number of HBr moles in 250.0 mL - 0.1128 mol
therefore number of HBr moles in 1000 mL - 0.1128 mol / 250.0 mL x 1000 mL = 0.4512 mol 
molarity of HBr - 0.4512 M

Which formula represents an organic compound?cah2c4h8h2o2p2o5?

Answers

Answer is: C₄H₈.
C₄H₈ is hydrocarbon, organic compound consisting only of carbon and hydrogen.
CaH₂ (calcium hydride) is alkaline earth hydride, inorganic compound.
H₂O₂(hydrogen peroxide) is pale blue, clear, inorganic liquid.
P₂O₅ (phosphorus pentoxide) is white, crystalline solid inorganic compound.

Final answer:

C4H8 is the formula that represents an organic compound among the given options because it contains both carbon and hydrogen atoms.

Explanation:

To determine which formula represents an organic compound, we must identify a compound containing carbon (C) with some hydrogen (H). Typically, organic compounds have carbon-hydrogen bonds and often contain other elements like oxygen, nitrogen, sulfur, and phosphorus.

Looking at the options provided:

CAH2 - Calcium hydride, an inorganic compound.

C4H8 - This is a hydrocarbon with four carbon atoms and eight hydrogen atoms, which is characteristic of an organic compound.

H2O2 - Hydrogen peroxide, an inorganic compound.

P2O5 - Diphosphorus pentoxide, an inorganic compound.

Therefore, C4H8 is the formula that represents an organic compound, as it consists of carbon and hydrogen atoms, meeting the criteria for organic chemistry.

What is the ph of a solution with [h3o+] = 1 × 10-9 m?

Answers

pH scale is used to determine how acidic, basic or neutral a solution is
pH can be calculated using the H₃O⁺
ph can be calculated as follows
pH = - log[ H₃O⁺]
[H₃O⁺] = 1 x 10⁻⁹
pH = - log [1 x 10⁻⁹]
 pH = 9
pH of solution is 9
Final answer:

The pH of a solution with a hydronium ion concentration of 1 × 10-9 M is 9, indicating that the solution is basic.

Explanation:

The pH of a solution is calculated by taking the negative logarithm of the hydronium ion concentration ([H3O+]). In this case, the hydronium ion concentration is given as 1 × 10-9 M. To find the pH of the solution, you would use the following equation:

pH = -log [H3O+]

In this example:

pH = -log(1 × 10-9)

Therefore, the pH is 9.

Since pH values less than 7.0 are acidic, values greater than 7.0 are basic, and a pH of 7.0 is neutral, this solution with a pH of 9 is considered basic.

The ka of hf is 6.8 x 10-4. what is the ph of a 0.35 m solution of hf?

Answers

when the reaction equation is:

HF ↔ H+   +   F-

and when the Ka expression
= concentration of products/concentration of reactions

so, Ka = [H+][F-]/[HF]

when we assume:

[H+] = [F-] = X

and [HF] = 0.35 - X

So, by substitution:

6.8 x 10^-4 = X^2 / (0.35 - X) by solving for X

∴ X = 0.015 M

∴[H+] = X = 0.015

when PH = -㏒[H+]

∴PH = -㏒0.015

        = 1.8

Helium gas has a molar mass of 4 g/mol. oxygen gas has a molar mass of 32 g/mol. how much faster or slower would helium effuse than oxygen from a small opening

Answers

According to Graham's Law of Diffusion,"the rates of diffusion of two gases are inversely proportional to the square root of their Molar masses or Densities at the same pressure and temperature".

                                     r₁ / r₂  =  [tex] \sqrt{M2 / M1} [/tex]
Where,
            r₁  =  Rate of Helium

            r₂  =  Rate of Oxygen

            M₂  =  Molar mass of Oxygen  =  32 g/mol

            M₁  =  Molar mass of Fluorine  =  4 g/mol

Putting values,

                                           r₁ / r₂  =  [tex] \sqrt{32 / 4} [/tex]

                                           r₁ / r₂  =  [tex] \sqrt{8} [/tex]

                                           r₁ / r₂  =  2.82
Result:
            Helium gas effuses 2.82 times faster than Oxygen gas.

What volume of hydrogen will be produced at STP by the reaction of 78.33 g of aluminum with excess water

Answers

the balanced equation for the above reaction is 
2Al + 6H₂O ---> 2Al(OH)₃ + 3H₂
stoichiometry of Al to H₂ is 2:3
number of Al moles reacted - 78.33 g / 27 g/mol = 2.901 mol
according to molar ratio 
2 mol of Al forms - 3 mol of H₂
therefore 2.901 mol of Al - forms 3/2 x 2.901 = 4.352 mol

molar volume states that 1 mol of any gas occupies a volume of 22.4 L at STP
if 1 mol occupies 22.4 L
then 4.352 mol occupies - 22.4 L/mol x 4.352 mol = 97.48 L
volume occupied by H₂ is 97.48 L
Final answer:

The reaction of 78.33 g of aluminum with excess water will produce approximately 97.44 L of hydrogen gas at standard temperature and pressure.

Explanation:

The reaction of aluminum with water produces hydrogen gas. To determine the volume of hydrogen that will be produced, you have to use stoichiometry.

Firstly, we need to convert the mass of aluminum to moles of aluminum using its atomic mass (26.98 g/mol). So, 78.33 g Al * (1 mol Al / 26.98 g Al) = ~2.90 moles of Al.

Secondly, we use the balanced chemical reaction for the reaction of aluminum with water, which is 2Al + 6H2O -> 2Al(OH)3 + 3H2. This shows us that for every 2 moles of Al reacted, 3 moles of H2 are produced.

Therefore, if we have 2.90 moles of Al, it would produce (2.90 moles Al * 3 moles H2 / 2 moles Al) = ~4.35 moles of H2.

Finally, at STP conditions, 1 mole of any gas occupies a volume of 22.4 L. Therefore, 4.35 moles of H2 will occupy (4.35 moles H2 * 22.4 L/mol) = 97.44 L of H2.

So, the reaction of 78.33 g of aluminum with excess water will produce approximately 97.44 L of hydrogen gas at STP.

Learn more about Stoichiometry here:

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A percent composition analysis yields 46.7% nitrogen and 53.3% oxygen. What is the empirical formula for the compound

Answers

empirical formula is the simplest ratio of whole numbers of components in a compound
calculating for 100 g of compound 
                                                     N                                   O
mass                                          46.7 g                              53.3 g
number of moles                  46.7 g / 14 g/mol                 53.3 g / 16 g/mol 
                                                  = 3.33                               = 3.33
divide by the least number of moles 
                                                3.33/ 3.33 = 1.00              3.33/3.33 = 0
number of atoms 
N - 1
O - 1
therefore empirical formula is NO

Answer:NO

Explanation:

it just is

Predict whether or not a precipitate forms upon mixing 175.0 ml of a 0.0055 mkcl solution with 145.0 ml of a 0.0015 m agno3 solution. identify the precipitate, if any.

Answers

there would be no precipitate unless there is an aqueous solution (aq) or water (w) identified in the question... I think. 
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