Answer:
0.0188
Explanation:
using pv=nRt
where v--volume
p pressure
n number of moles
t temperature in kelvin
R molar gas constant=8.314atmmoldm^-3k^-1
4.972 × 9.583 =n × 8.314 × (31.8 + 273)
note I changed 31.8c to kelvin
making n subject of the formula
n=(4.972 × 9.583)/(8.314 ×(31.8 + 273)
n=(4.972 × 9.583)/(8.314 ×(304.8))
n=0.0188 moles
how many moles of hydrogen ions are present in a 2L solution with a pH of 2.75
We are given:
Volume = 2 L
pH = 2.75
Finding the concentration required:
we know that pH is just the negative log of the hydrogen ion concentration
pH = -log[H⁺]
we are given that the pH is 2.75
2.75 = -log[H⁺]
log[H⁺] = -2.75 [multiplying both sides by -1]
[tex]10^{log[H]} = 10^{-2.75}[/tex]
[H⁺] = 1.78 * 10⁻³ Molar
Number of moles of Hydrogen ions:
[H⁺] = 1.78 * 10⁻³ Molar
which means that there are 1.78 * 10⁻³ moles of hydrogen ions in 1 liter solution
1.78 * 10⁻³ moles / L
multiplying and dividing by 2, we get:
3.56 * 10⁻³ moles / 2 L
Hence we need 3.56 * 10⁻³ moles of hydrogen ions
Answer:
3.556x 10^-3mol
Explanation:
Using pH =-log [ H+], we can calculate the concentration of the hydrogen Ions.
pH =-log [ H+], pH = 2.75
2.75 = -log[H+], taking antilog of both sides
10^ — 2.75 = [H+]
[H+] =1. 778 x 10^-3M
Now that we have the concentration and also knows the volume, we can use the relation
Moles = concentration X volume
= 1. 778 x 10^-3M x 2L = 3.56x 10^-3mol
The moles of the hydrogen Ions is 3.56x 10^-3mol
An ion and its parent atom differ in....? 1) All of the options are correct 2) electron configuration. 3) chemical reactivity. 4) number of electrons.
226 • Ra 4/2 He + 88 = ?
Answer: the answer for this question is in the pic
Explanation:
Which statement about Niels Bohr’s atomic model is true?
Answer:
Each orbit has a specific energy level.
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What is the final concentration when 275 mL of 20.0 % W/V hydrogen peroxide solution is diluted to 1.000 L?
20.0 % W/V
0.30 % W/V
55.0 % W/V
5.50 % W/V
Answer:
20.0% w/v A
Explanation:
A 20.0 w/V...
what makes a compound a pure substance
Answer:
Compounds contain more than one type of material. Yet both compounds and elements are considered pure substances.
Pure compounds are created when elements combine permanently, forming one substance
Extra:
So, a mixture can be separated into its original components, while a pure compound cannot.
What volume of O2 at STP is required to oxidize 8.0 L of NO at STP to NO2? What volume of NO2 is produced at STP?
The balanced equation of the reaction is:
[tex]O_2 + 2 NO[/tex] ⇒ [tex]2 NO_2[/tex]
Every gas occupied 24 L in one mole in r.t.p. according to the equation:
[tex]24 \times n = V[/tex]
8/24=0.333 mol
2 moles of NO makes 2 moles of [tex]NO_2\\[/tex] so
0.333*24=8L
Si de una caja de gelatina de 30g, se obtiene 5 porciones. Cuantas cajas y cuantos gramos se requieren para preparar 100 porciones.? respuestas concretas por fis
Answer:
20 cajas - 600 gramos
Explanation:
Veamos los datos informados:
1 caja → 5 porciones
1 caja → 30 g
Si queremos preparar 100 porciones, indudablemente necesitamos:
100 porciones . 1 caja / 5porciones = 20 cajas
Finalmente ya sabemos que una caja tiene 30 g
Entonces, si tenemos 20 cajas . 30 g / 1 caja = 600 g
En conclusión:
Necesitamos una masa total de 600 gramos en 20 cajas
Lithium chloride + Iron → ?
Answer:
Lithium chloride + Iron
No reaction takes place, because lithium is more reactive than iron, so Iron cannot displace lithium from its solution.
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Which process produces the energy that is used in photosynthesis?
O A. Nuclear fusion
B. Chemical reactions
C. Nuclear fission
D. Nuclear decay
Answer: Nuclear fusion
Explanation:
The process that produces the energy that is used in photosynthesis is nuclear fusion. option A is correct.
Photosynthesis is the process by which light energy is converted into chemical energy in the form of sugars. This chemical energy is produced as a result of nuclear fusion reaction .
Photosynthesis takes place in chloroplasts of plants, which are found in the mesophyll of leaves. Inside the chloroplast, is the thylakoids, where the chlorophyll absorbs the various hues of light and nuclear fusion reaction takes place to create energy .
Using light energy, oxygen is produced as a byproduct while carbon dioxide and water are converted to glucose .
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dawdDAWdADdwaadadadawddawd
Answer:
yyuuuyytt
Explanation:
ggyhggggg,,,,,,,76yyygtyyhgyyggyuhu ubbububuuh7h7h
Which of the following is a redox reaction? (HELP ASAAAP)
A)
MgCO3 → MgO + CO2
B)
Mg(OH)2 + 2HCl → MgCl2 + H2O
C)
CuO + H2SO4 → CuSO4 + H2O
D)
3MnO2 + 4Al → 3Mn + 2Al2O3
Answer:
D
Explanation:
Al is a reducing agent because it removes Oxygen from another compound
Mno2 is an oxidizing agent
Can you please help me with this?
What happens with the evaporation of raindrops in the atmosphere?
Answer:
they become water vapor and after that, they become a type of precipitation
Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4? Which is the net ionic equation for the reaction?
Answer:
See explanation
Explanation:
A balanced chemical reaction equation has the same number of atoms of each element on both sides of the reaction equation.
Hence, for the reaction between KOH and H2SO4, the balanced chemical reaction equation is;
H2SO4(aq) + 2KOH(aq) ---------> K2SO4(aq) + 2H2O(l)
Complete ionic equation;
2H^+(aq) + SO4^2-(aq) + 2K^+(aq) +2OH^-(aq) -------> SO4^2-(aq) + 2K^+(aq) + 2H2O(l)
Net ionic equation;
2H^+(aq) + 2OH^-(aq) -------> 2H2O(l)
HELPPP!!!
The emission of electromagnetic energy from an atomic nucleus is called_______
decay.
Gamma decay, type of radioactivity in which some unstable atomic nuclei dissipate excess energy by a spontaneous electromagnetic process. In the most common form of gamma decay, known as gamma emission, gamma rays (photons, or packets of electromagnetic energy, of extremely short wavelength) are radiated.
For each of the following sets of elements, state whether all of the elements are in the same group, the same period, or neither the same group or the same period.
a. Fe, Ru, Os
b. Rh, Pd, Ag
c. Sn, As, S
d. Se, Te, Po
Answer:
a. Same group, different period
b. Different group, same period
c. Different group, different period
d. Same group, different period
The specific heat capacity of water is 4.186 J/g °C
Calculate the temperature change when 8000 J of heat is added to 3g of water.
Use the equation q=mcT
Answer:
Solution given:
specific heat capacity of water [c]4.186 J/g °C
temperature[∆T]=?
mass[m]=3g
heat[Q]=8000J
we have
Q=mc∆T
8000=3*4.186*∆T
∆T=8000/12.558
∆T=637.04°C
the temperature change is 637.04°C.
If you sprain your ankle and place a cold pack on it, how does the motion of molecules in your ankle change?
Answer:
that heat energy speeds up the motion of the particles and the temperature of the reaction
Explanation:
HOPE IT HELPS
When we place an ice pack on a sprained ankle, the blood flow is reduced which prevents further swelling, ice reduces the blood flow which is necessary when the ankle is injured.
What happens after placing an ice pack?The flow of blood and the lymph vessel is limited or decreased after applying an ice pack, this is an immediate first aid to be given to the injured person
After 2-3 days of the injury, a hot pack should be applied to increase the blood flow and the lymph flow for an activity.
Hence, the molecule flow is reduced after applying an ice pack to the sprained ankle
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30 ml of gas is changed from 4 atm to 2 atm what is the new volume
Answer:
[tex]\boxed {\boxed {\sf 60 \ mL}}[/tex]
Explanation:
In this problem, volume and pressure are changing, so we use Boyle's Law. This states that the volume of a gas is inversely proportional to the pressure. The formula for this law is:
[tex]P_1V_1=P_2V_2[/tex]
Originally the gas has a volume of 30 milliliters and a pressure of 4 atmospheres.
[tex]4 \ atm * 30 \ mL=P_2V_2[/tex]
The pressure is changed to 2 atmospheres, but the new volume is unknown.
[tex]4 \ atm * 30 \ mL = 2 \ atm *V_2[/tex]
We want to solve for the new volume (V₂). It is being multiplied by 2 atmopsheres. The inverse operation of multiplication is division, so we divide both sides by 2 atm.
[tex]\frac{4 \ atm * 30 \ mL}{ 2 \ atm}= \frac{ 2 \ atm *V_2}{2 \ atm}[/tex]
[tex]\frac{4 \ atm * 30 \ mL}{ 2 \ atm}= V_2[/tex]
The units of atmospheres (atm) cancel.
[tex]\frac{4 * 30 \ mL}{ 2 }= V_2[/tex]
[tex]\frac{120 \ mL}{2}= V_2[/tex]
[tex]60 \ mL= V_2[/tex]
The new volume of the gas is 60 milliliters.
when electrical energy is converted into any other deform of energy, the total amount of energy
A solution contains 35.00 g of sodium chloride in 100. G of water at 45.0C. How could this solution be described
Answer:
It is unsaturated
Explanation:
A solution is said to be unsaturated when it contains less solute than it can normally hold at a given temperature.
The solubility of NaCl remains fairly independent of temperature hence the line for the solubility of NaCl remains fairly flat in the solubility curve.
The solubility of NaCl is about 36 g of NaCl in 100g of water. Hence a solution that contains 35.00 g of sodium chloride in 100 g of water at 45.0C is unsaturated.
What mass of methanol (CH3OH) is produced when 140.1 g of carbon
monoxide reacts with 12.12 g of hydrogen?
CO(g) + 2H2(g) → CH2OH()
A. 160.2g
B. 96.12 g
C. 6.06 g
D. 192.2g
Answer:
B. 96.12 g
Explanation:
To solve this question we must convert each reactant to moles. Using the balanced equation we can find limiting reactant. With moles of limiting reactant we can find the moles of methanol and its mass:
Moles CO -Molar mass: 28.01g/mol-
140.1g CO * (1mol / 28.01g) = 5.0 moles CO
Moles H2 -Molar mass: 2.01g/mol-
12.12g * (1mol / 2.01g) = 6.03 moles H2
For a complete reaction of 5.0 moles of CO are required:
5.0moles CO * (2mol H2 / 1mol CO) = 10.0 moles of H2 are required
As there are just 6.03 moles, H2 is limiting reactant.
The moles of methanol produced are:
6.03 moles H2 * (1mol CH3OH / 2mol H2) = 3.015 moles CH2OH
Mass CH3OH -Molar mass32.04g/mol-:
3.015 moles CH2OH * (32.04g/mol) =
96.6g CH3OH ≈ B. 96.12 g
How many moles are in 3.90 x1030 atoms of Zn?
ano ang kahulugan ng sekswalidad?
ano ang naakit sa isang tao..at kung ano ang iyong kasarian ay
To draw a Lewis structure for a covalent compound, begin by calculating A, the available electrons, and N, the needed electrons. What is N for silicon tetrachloride, SiCl4?
Answer:
To draw a Lewis structure for a covalent compound, begin by calculating A, the available electrons, and N, the needed electrons.
What is N for silicon tetrachloride, SiCl4?
Explanation:
A covalent compound is formed by the mutual sharing of electrons between two atoms.
According to Lewis octet theory, every atom wants to attain eight electrons around it.
For the given molecule SiCl4
Silicon has four valence electrons.
To attain the nearest inert gas configuration it requires four more electrons.
Each chlorine atom shares an electron and thus silicon attains eight electrons in its valence shell.
The Chlorine atom has seven valence electrons.
To get eight electrons in its valence shell it needs one more electron.
That is shared by the silicon atom.
Thus both Si and Cl attain eight valence electrons by sharing electrons and for the covalent bond.
N value for Si is --- 4.
A the available electrons for Si is ---- 4.
The available electrons for Si 4 and the needed electrons are also 4. A covalent compound is formed by the equal sharing of electrons between two atoms.
A covalent compound is formed by the equal sharing of electrons between two atoms.
According to Lewis octet theory, every atom wants to attain eight electrons in the shell.
For the given molecule [tex]\bold {SiCl_4}[/tex]
Silicon has four valence electrons and Chlorine has 7 electrons in the valence shell. It requires four more electrons to attain the nearest inert gas configuration for silicon and one more electron for chlorine. Each chlorine atom shares an electron and thus silicon attains eight electrons in its valence shell.
Thus both Si and Cl attain eight valence electrons by sharing electrons and for the covalent bond.
Therefore, the available electrons for Si 4 and the needed electrons are also 4.
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How is an alkoxide ion formed??
how many moles are in 54g of sliver
Answer:
0.50 mols Ag
Explanation:
Given the data, we have:
mass= 54g
molar mass of Silver (Ag): 107.8 g/mol
We want moles, we can convert grams > moles using the molar mass as a "bridge" between the 2.
[tex]54g * \frac{1 mol}{107.8 g}= 0.50 mols Ag[/tex]
Keeping an eye on the units, we'll see 54g get cancelled out by 107.8 g/mol and we'll be left with moles of Silver.
When you perform a stoichiometry calculation, you are determining the ...
A) actual yield
B) theoretical yield
C) percent yield
Answer:
B) Theoretical
Explanation:
Just did the question
Write a neutralization reaction to form the salt k2so4
H2SO4 + 2KCL ----------› K2SO4 + 2HCL
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At the carnival, a baby was given a helium balloon whose
pressure equaled the atmospheric pressure at the carnival
which was 102.7 kPa. However, the baby wasn't paying
attention and the balloon floated away into the troposphere
where the atmospheric pressure is 97.8 kPa. What is the
positive difference between the pressure in the balloon and
the pressure of the troposphere in atm?
atm
Answer: 0.048 kPa
Explanation: no clue i just looked it up you’re welcome y’all:)