Answer:
The answer is "4.31"
Explanation:
aniline millimoles [tex]= 111 \times 0.37 = 41.07[/tex]
added [tex]HNO_3[/tex] millimoles [tex]= 79.1 \times 0.35 = 27.685[/tex]
[tex]\to 41.07 - 27.685 = 13.385[/tex] millimoles aniline left
[tex]\to 27.685[/tex] millimoles salt formed
total volume[tex]= 111 + 79.1 = 190.1\ mL\\\\[/tex]
[tex]\to [aniline] = \frac{13.385}{190.1} = 0.07 \ M\\\\\to [salt] =\frac{ 27.685}{ 190.1} = 0.146\ M\\\\\to pOH = pKb + \frac{\log [salt]}{ [base]}\\\\\to pOH = 9.37 + \frac{\log [0.146]}{[0.07]}\\\\\to pOH = 9.69\\\\\to pH = 14 - 9.69\\\\\to pH = 4.31\\[/tex]
3 Zn + 2 H3PO4 → 3 H2 + Zn3(PO4)2
How many grams of Zn are needed in order to produce 0.15 g of H2?
Answer: 4.87 g
Explanation:
We know that for every 3 moles of zinc that are consumed, 3 moles of hydrogen are produced (we can reduce this to the number of moles of zinc consumed = moles of hydrogen produced)
We know that the formula mass of hydrogen is 2(1.00794)=2.01588 g/mol, so in 0.15 g, there is about 0.15/2.01588 = 0.074409191023275 moles.
This means that about 0.074409191023275 moles of zinc are needed, and since the atomic mass of zinc is 65.409 g/mol, the answer is (0.074409191023275)(65.409)=4.87 g
C3H8+3O2 = 3CO2+4H2O what is the enthalpy combustion please show work
Answer:
[tex]\Delta H_{comb}=2043.85kJ/mol[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reaction, it possible for us to set up the expression for the calculation of the enthalpy change as shown below:
[tex]\Delta H_r=-\Delta H_{comb}=3\Delta _fH_{CO_2}+4\Delta _fH_{H_2O}-\Delta _fH_{C_3H_8}-3\Delta _fH_{O_2}[/tex]
Thus, given the values of the enthalpies of formation on the attached file, we obtain:[tex]-\Delta H_{comb}=3(-393.5kJ/mol)+4(-241.8kJ/mol)-(-103.85kJ/mol)-3(0kJ/mol)\\\\-\Delta H_{comb}=-2043.85kJ/mol\\\\\Delta H_{comb}=2043.85kJ/mol[/tex]
Best regards!
Why is soap able to break down oils and fats?
Answer:
When you build up a soapy lather, the molecules help lift the dirt, oil and germs from your skin
Explanation:
Soap molecules have one end that bonds with water and the other end that bonds with oils and fats .
Hope this helped!!
What is the volume of 45 g of Hydrogen gas (H2) at STP?
How many molecules of carbon tetrafluoride, CF4, are in 176 grams of CF4?
Answer:
1.2*10^24 molecules of CF4
Explanation:
the molar mass of cf4 is 88.0043 g/mol
176/88.0043 = 2 moles of CF4
Then multiply by avogadro's number (6.022*10^23) to get the number of molecules
2*6.022*10^23 = 1.2*10^24 molecules of CF4
There are 1.204 × 10²⁴ molecules of carbon tetrafluoride in 176 grams of CF4.
HOW TO CALCULATE NUMBER OF MOLECULES:
The number of molecules in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number:no. of molecules = no. of moles × 6.02 × 10²³The number of moles in CF4 can be calculated as follows:moles of CF4 = mass of CF4 ÷ molar mass of CF4. Molar mass of CF4 = 12 + 19(4)Molar mass of CF4 = 88g/molmoles of CF4 = 176g ÷ 88g/molmoles of CF4 = 2molNo. of molecules = 2 × 6.02 × 10²³no. of molecules = 12.04 × 10²³no. of molecules = 1.204 × 10²⁴ Therefore, there are 1.204 × 10²⁴ molecules of carbon tetrafluoride in 176 grams of CF4.Learn more at: https://brainly.com/question/11815186?referrer=searchResults
A chemical breaks down in a flow-balanced, steady-state CFMR according to first-order reaction kinetics. At steady state, the upstream and downstream concentration of the chemical are 15 mg/L and 5 g/m3. Water is being treated at a rate of 0.42 m3/sec. The volume of the tank is 500,000 liters. Assuming a first-order reaction, what is the rate constant
Answer:
[tex]k =0.101 \ min^{-1}[/tex]
Explanation:
From the given information:
The initial concentration of a chemical [tex]C_{AO} = 15 \ mg/L[/tex]
The final concentration is [tex]C_A = 5 \ g/m^3[/tex] = 5 mg/L
Volume flow rate [tex]V_o = 0.42 \ m^3/sec[/tex]
Volume of the tank V = 500 000 L = 500 m³
The time t is determined by using the formula:
[tex]t= \dfrac{V}{V_o}[/tex]
[tex]t= \dfrac{500 \ m^3}{0.42 \ m^3/sec}[/tex]
t = 1190.47 sec
t ≅ 19.8 min
∴
The rate of the decay constant is:
[tex]kt= \dfrac{C_{AO}-C_{A}}{C_A} \\ \\ k = \dfrac{1}{19.8}( \dfrac{15-5}{5})[/tex]
[tex]k =0.101 \ min^{-1}[/tex]
find the pH of a 0.00476M HCI solution
Ans：2.3
Explanation:
pH = -log[H+(aq)]
= -log[0.00476]
=2.3
As HCl solution is monobasic. Each molecule ionizes in water to form ONE hydrogen ion. So the H+(aq) is equal to its molarity.
2.3 is he pH of a 0.00476 M HCI solution and this value tells that solution is acidic in nature.
How we calculate pH of any solution?
pH of any solution can be define as the negative log of the concentration of the H⁺ ions.
In the question given that:
Concentration of HCl solution = 0.00476 M
Concentration of H⁺ ions is equal to concentration of HCl solution as it completely ionize into their ions. So, pH can be calculated as:
pH = -log[H⁺] = -log[0.00476] = 2.3
Hence, pH of the solution is 2.3.
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explain how convection currents affect sea breezes and land breezes.
pls help
What is the Kc for the following reaction at equilibrium at 500∘C if [N2]= 0.41 M , [H2]= 0.41 M , and [NH3]= 2.2 M ? N2(g)+3H2(g)⇌2NH3(g)
Answer:
answer po Yan hope it help
what is the difference between transmutation and natural radioactivity
Answer:
o diferença chave entre a radioatividade e a transmutação é que a radioatividade se refere à transmutação natural, enquanto a transmutação se refere à mudança de um elemento químico em outro por meios naturais ou artciais.Tanto a radioatividade quanto a transmutação são processos químicos que envolvem a mudança de núcleos atômicos para formar um novo elemento químico a partir de um elemento químico existente. A radioatividade é um tipo de processo de transmutação
Explanation:
mais informação em; ahttps://pt.strephonsays.com/radioactivity-and-transmutation-9500
For the following exothermic reaction system at equilibrium:
H2O(g) CO(g) CO2(g) H2(g)
Choose the changes that will increase the value of K.
a. Decrease the volume (constant T)
b. Add H2O(g) (constant T)
c. Remove H2(g) (constant T)
d. Add a catalyst (constant T)
e. Add CO2(g) (constant T)
f. Increase the temperature
g. Decrease the temperature
Answer:
See explanation.
Explanation:
Hello there!
In this case, for the chemical reaction:
[tex]H_2O(g) CO(g)\rightleftharpoons CO_2(g) H_2(g)[/tex]
It is widely known that the the only factor altering the equilibrium constant is the temperature because of its thermodynamic definition:
[tex]K=exp(-\frac{\Delta G(T)}{RT} )[/tex]
Which is temperature dependent on the denominator and on the Gibbs free energy of reaction. In such a way, the answers can be just f and g, as the other factors modify Q (reaction quotient) rather than K. Thus, we can discuss about f and g:
f. This would increase K if the Gibbs free energy of reaction is positive (nonspontaneous).
g. This would increase K if the Gibbs free energy of reaction is negative (spontaneous).
It is important to discuss those two because the Gibbs free energy is not given.
Regards!
How many grams of KCl will be formed from 0.500 grams of KClO3?
Answer:
0.31g KCl
Explanation:
Before we can start, we have to wonder, how many moles of KCl is formed from KClO3? To figure that out we have to make a balanced equation.
KClO3 -> KCl + O2
How do I know it makes O2? Looking back at the problem they're asking for KCl, which has less ions than KClO3 so it must have been broken down. So we can say it's a decomposition type of reaction. We can't just slap on O3, we know oxygen is one of our diatomic elements that usually exists as O2 so we'll put it down as O2 and balance our equation.
2KClO3 -> 2KCl + 3O2
Now that we know every 2 moles of KClO3 makes 2 moles of KCl, this is our mole to mole ratio. Knowing the ratio between the 2 compounds in our problem is the stepping stone from converting from grams KClO3 -> moles KClO3 -> moles KCl -> grams KCl.
1. Let's first convert grams KClO3 -> moles KClO3
[tex]0.500g KClO3 x \frac{1 mol}{123g KClO3} = 0.0041 mol KClO3[/tex]
2. Convert moles KClO3 -> moles of KCl using our mole to mole ratio
[tex]0.0041 mol KClO3 x \frac{2 mol KCl}{2 mol KClO3} = 0.0041 mols KCl[/tex]
3. Convert moles KCl -> grams KCl
[tex]0.0041 mol KCl x\frac{75g KCl}{1 mol} = 0.31g KCl[/tex]
A jet is goes from 180km/s to 139km/s in 22 seconds. What is it's acceleration?
14. V=
15. Vp =
16. t=
17a=
If 0.8675 g of KHP requires 24.56 mL of an NaOH solution to reach the equivalence
point in the titration, what is the concentration of the NaOH?
Answer:
[tex]M_{base}=0.173M[/tex]
Explanation:
Hello there!
In this case, since the titration of acids like KHP with bases like NaOH are performed in a 1:1 mole ratio, it is possible for us to know that their moles are the same at the equivalence point, and the concentration, volume and moles are related as follows:
[tex]n_{acid}=M_{base}V_{base}[/tex]
Thus, by solving for the volume of the base as NaOH, we obtain:
[tex]M_{base}=\frac{n_{acid}}{V_{base}} \\\\M_{base}=\frac{0.8675g*\frac{1mol}{204.22g} }{0.02456L} \\\\M_{base}=0.173M[/tex]
Best regards!
1 interpret geochemistry in your words. 2. how can you explain that the solar system (sun, all planets and satellites) has all been formed from a special nebula ?
Explanation:
(I only know this thing vaguely lol)
1.) It's the study of the chemistry that is happening here on earth that is not bounded by a laboratory.
2.) The early gas clouds compressed and formed a star we now call the sun and the massive gravitational pull of this star grabbed nearby debris and the debris formed and compressed into the planets and moons that we know today.
calculate the percentage of CL in AL(CLO3)3
Answer:
46.41%
Explanation:
Find the total r.m.m of AL(CLO3)3 put it equals to 100%.....The take 106.5,the total r.m.m of Cl and find the missing which is the percentage by cross multiplication
What type of ions have names ending in -ide?
O only cations
O. only anions
O only metal ions
O only gaseous ions
Answer:
Only anions
Explanation:
Polyatomic positive ions often have common name ending with the suffix anions
Arenediazoniums can undergo electrophilic aromatic substitutions with a wide variety of activated aromatic compounds to yield new azo dyes.
a. True
b. False
37.4 g of aluminum chloride reacts with bromine gas to yield aluminum bromide and chlorine gas. How many liters of bromine gas is needed to completely react with aluminum chloride? Assume both gases are at STP.
Answer:
9.43 L Br₂ (g)
Explanation:
First, write a balanced reaction equation. Then use dimensional analysis to convert from grams of aluminum chloride to moles of aluminum chloride (with molar mass from the periodic table), from moles of aluminum chloride to moles of bromine gas (using the balanced equation), and from moles of bromine gas to liters of bromine gas (remember at STP, 1 mol = 22.4 L). See the attached image for the work out. Finally, account for sig figs to get 9.43 L of bromine gas
How many molecules of O2 will be required to produce 28.8 g of water?
Identify the reaction type of the chemical reaction below. Check all that apply.
Mg (s)+2 HCl (aq) MgCl 2 (aq)+H 2 (g)
Answer:
The type of reaction is a single-replacement reaction.
Explanation:
Mg switches places with H, leaving H by itself.
giving brainliest!
links=reported
Answer:
C₃H₈O
Explanation:
From the question given above, the following data were obtained:
Mass of Carbon (C) = 0.599 g
Mass of Hydrogen (H) = 0.134 g
Mass of Oxygen (O) = 0.266 g
Empirical formula =?
The empirical formula of the compound can be obtained as follow:
C = 0.599 g
H = 0.134 g
O = 0.266 g
Divide by their molar mass
C = 0.599 / 12 = 0.050
H = 0.134 / 1 = 0.134
O = 0.266 / 16 = 0.017
Divide by the smallest
C = 0.050 / 0.017 = 3
H = 0.134 / 0.017 = 8
O = 0.017 / 0.017 = 1
Empirical formula => C₃H₈O
3.
Calculate the mass in grams needed to have 2.65 x 1022 atoms of calcium.
८८
2.65 x 10²
Answer:
[tex]=1.76gCa[/tex]
Explanation:
Hello there!
In this case, according to the given atoms of calcium, it is possible to calculate the mass of this element by considering that the definition of mole is in terms of atoms and also the atomic mass of calcium:
[tex]1molCa=6.022x10^{23}atoms Ca=40.08gCa[/tex]
In such a way, by considering the following setup, we can obtain:
[tex]=2.65x10^{22}atomsCa*\frac{1molCa}{6.022x10^{23}atoms} *\frac{40.08gCa}{1molCa}\\\\=1.76gCa[/tex]
Best regards!
How did Robert Millikan's oil drop experiment change scientists' view of the
atom?
A. It identified the location of the nucleus.
B. It showed that atoms could not be divided into smaller particles.
C. It identified the charge on a single electron.
D. It showed that atoms were found in different energy levels.
SUBMIT
Answer:
Hello There!!
Explanation:
I think the answer is possibly C. It identified the charge on a single electron.
hope this helps,have a great day!!
~Pinky~
[tex]\huge{\textbf{\textsf{{\color{navy}{An}}{\purple{sw}}{\pink{er}} {\color{pink}{:}}}}}[/tex]
C. It identified the charge on a single electron.
ThanksHope it helps
Graphite is one of the allotropes of carbon
a) Define the term allotropy
b) Identify the other allotrope of carbon
c) State two uses of graphite
Answer:
When an element exists in more than one crystalline form, those forms are called allotropes; the two most common allotropes of carbon are diamond and graphite. Every carbon atom is covalently bonded at the four corners of the tetrahedron to four other carbon atoms.
Complete the sentence using the correct word: conduction,
convection or thermal energy.
The method of heat transfer that occurs when particles move
through a fluid is called
Answer:
Convection
Explanation:
Convection definition:
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
The method of heat transfer that occurs when particles move through a fluid is called convection.
Convection relies on the principle of fluid flow, where hotter particles become less dense and rise while cooler particles sink due to their increased density.
This movement creates a continuous circulation of the fluid, enabling the transfer of thermal energy. As the hot particles rise, they carry their thermal energy with them, and as the cooler particles sink, they absorb heat from their surroundings.
Convection is also observed in natural phenomena such as ocean currents, air currents, and even the movement of magma in the Earth's mantle.
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Which process directly moves nutrients from plants to animals?
A. Feeding
B. Breathing
C. Photosynthesis
D. Mineralization
Answer:
Dude its A.Feeding
Explanation:
Its common scene that when u eat you are getting nutrient directly from the food. Come on Sponge Bob Me Boy
Consider 4 g N2O5, in a test tube. [Given: Ar(N) = 14, Ar(O) = 16]
What is the percentage oxygen in N2O5? (Give your answer in 4 significant figures)
Answer:
74.08%
Explanation:
We'll begin by calculating the mass of
Oxygen in 4 g of N₂O₅. This can be obtained as follow:
Molar mass of N₂O₅ = (14×2) + (16×5)
= 28 + 80
= 108 g/mol
Mass of oxygen in N₂O₅ = 5 × 16 = 80 g
Mass of oxygen in 4 g of N₂O₅
= 80 / 108 × 4
= 2.963 g
Finally, we shall determine the percentage of oxygen in 4 g of N₂O₅. This can be obtained as follow:
Mass of oxygen = 2.963 g
Mass of N₂O₅ = 4 g
Percentage of oxygen =?
Percentage of oxygen = mass of oxygen / mass of N₂O₅ × 100
Percentage of oxygen = 2.963 / 4 × 100
Percentage of oxygen = 74.08%
How long did it take to get the Hubble Telescope into space?
i killed someone now what?? police are surrounding my house im hiding in my closet i don't know why im on this app but maybe i can get some help cause it isn't a joke