Answer:
Ka = 1.14x10⁻⁸
Explanation:
First we calculate [H⁺] from the pH:
pH = -log[H⁺][H⁺] = [tex]10^{-pH}[/tex][H⁺] = 6.31x10⁻⁵ MFor a monoprotic weak acid, the molar concentration of H⁺ of a solution can be expressed as:
[H⁺] = √(C*Ka)Where C is the molar concentration of the weak acid solution.
6.31x10⁻⁵ M = [tex]\sqrt{0.35M*Ka}[/tex]1.14x10⁻⁸ = KaWhich of the first four radioisotopes in the decay series has the longest half-life? Pa-234 Th-234 U-234 U-238
Answer:
can u explain a little more then i will help like what are the four
Explanation:
Answer:
d) U-238
Explanation:
edg 2021
To lower the chance of suffering from decompression sickness (the bends), scuba divers use a mixture of gases in their air tank (typically oxygen and nitrogen gas in recreational dives). Assuming no other gas is present besides oxygen and nitrogen, if the mole fraction of oxygen present is 0.21, what is the partial pressure of nitrogen gas if the total pressure is 111.7 atm
Answer: The partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.
Explanation:
Given: Mole fraction of oxygen = 0.21
Total pressure = 111.7 atm
It is known that the sum of moles fractions is always equal to 1. So, mole fraction of nitrogen is calculated as follows.
Mole fraction of nitrogen + mole fraction of oxygen = 1
Mole fraction of nitrogen = 1 - mole fraction of oxygen
Mole fraction of nitrogen = 1 - 0.21
Mole fraction of nitrogen = 0.79
Now, formula used to calculate the partial pressure of nitrogen is as follows.
[tex]P_{N} = X_{N} \times P_{total}[/tex]
where,
[tex]P_{N}[/tex] = partial pressure of nitrogen
[tex]X_{N}[/tex] = mole fraction of nitrogen
[tex]P_{total}[/tex] = total pressure
Substitute the values into above formula as follows.
[tex]P_{N} = X_{N} \times P_{total}\\= 0.79 \times 111.7 atm\\= 88.243 atm[/tex]
Thus, we can conclude that the partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.
how many atoms of potassium are in 4.25 g of potassium
Answer:
6.55 x 10^22 atoms K
Explanation:
Convert from grams to moles (using K molar mass)
K molar mass = 39.098 g/mol
4.25 g K x 1 mol K / 39.098 g K
[grams cancel out]
= 0.1087 mols K
Convert from moles to atoms (using Avogadro's number)
Avogadro's number = 6.0221 x 10^23
0.1087 mols K x 6.0221 x 10^23 atoms K / 1 mols K
[mols cancel out]
= 6.545987 x 10^22
[with proper significant digits.....]
= 6.55 x 10^22 atoms K
A 0.227 mol chunk of dry ice (solid CO2) changes to gas. What is the volume of that gas measured at 27 °C and 740 mmHg?
Answer:
Explanation:3.2 ft 2 fti2 ft 4 ft ft2
Control rods in nuclear reactors are made of materials that absorb free neutrons in order to
slow down the chain reaction.
True
False
How is water important to many branches of science?
Answer:
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.
by what process does water vapor become a cloud?
a. evaporation
b. transpiration
c. condensation
d. precipitation
solve using the distributive property
- 592×7 + 592 × 3
Answer:
= -592 (7+3)
= 592 ×10
= -5920
hope it helps u
Mark me brainless
HELLP ME PLSSS
The passing of heat through a material is called ________.
A. vibration
B. conduction
C. radiation
D. convectio
Answer:
B
Explanation:
conduction is the transfer of heat between objects that touch
Hydrogen iodide can decompose into hydrogen and iodine gases. 2HI(g) H2(g) I2(g) K for the reaction is 0.016. Of 0.148 atm of HI(g) is sealed in a flask, what is the pressure of each gas when equilibrium is established
Solution :
Given :
Hydrogen iodide decomposes to hydrogen and iodine gas
[tex]$2 HI \ \ \ \Leftrightarrow \ \ \ \ H_2 \ \ \\ + \ \ I_2 $[/tex]
I 0.148 0 0
C -2a +a +a
E 0.148-2a a a
We know
[tex]$k_p=\frac{P(H_2)P(I_2)}{P(HI)^2}$[/tex]
[tex]$0.016=\frac{a^2}{(0.148-2a)^2}$[/tex]
[tex]$0.016^{1/2}=\frac{a}{0.148-2a}$[/tex]
[tex]$0.12649=\frac{a}{0.148-2a}$[/tex]
0.0187 = 1.2529 a
a = 0.0149
Therefore
P(HI) = 0.148 - 2a
= 0.148 - 2(0.0149)
= 0.1182 atm
P([tex]$H_2$[/tex]) = a
= 0.0149 atm
P([tex]$I_2$[/tex]) = a
= 0.0149 atm
How many grams of Ni are formed from 55.3 g of Ni2O3?
2Ni2O3(s)⟶4Ni(s)+3O2(g)
Answer:
39.2 g
Explanation:
2Ni₂O₃(s) ⟶ 4Ni(s) + 3O₂(g)First we convert 55.3 grams of Ni₂O₃ into moles of Ni₂O₃, using its molar mass:
55.3 g ÷ 165.39 g/mol = 0.334 mol Ni₂O₃Then we convert 0.334 moles of Ni₂O₃ into moles of Ni, using the stoichiometric coefficients of the balanced reaction:
0.334 mol Ni₂O₃ * [tex]\frac{4molNi}{2molNi_2O_3}[/tex] = 0.668 mol NiFinally we calculate how much do 0.668 Ni moles weigh, using the molar mass of Ni :
0.668 mol Ni * 58.69 g/mol = 39.2 gWhich subatomic particles are transferred in a redox reaction?
Answer: Electrons
Explanation:
A chemical equilibrium exists when: A chemical equilibrium exists when: there are equal amounts of reactants and products. the rate at which reactants form products is the same as the rate at which products form reactants. the sum of reactant and product concentrations equals one mole. reactants are completely changed to products. the rate at which reactants form products becomes zero.
Answer: A chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.
Explanation:
When the concentration of both the reactants and products do not change with time then it means the chemical reaction has reached to a state of chemical equilibrium.
For example, [tex]CO(g) + Cl_{2}(g) \rightleftharpoons COCl_{2}(g)[/tex]
Therefore, we can conclude that a chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.
When the ball is at rest, what forces are acting on it?
What is the volume, in cubic meters, of an object that is 0.21 m long, 4.7 m wide, and 5.3 m high?
Answer:
The formula for volume of a rectangle is length multiply by width multiply thus, 0.25 m multiply 6.1 m multiply by 4.9 m = 7.5m^3.
Explanation:
the least number of significant figures is 2 thus the final answer will have the same number of significant figures. 7.5m^3
=jskidwkjicdovfojvoeeeeeeeeeeeeeeeeeeeeeeeec
Answer:
you need a theripist or maybe just your girl if this is your question.
Explantion: you are clearly very weird but very cute and ily.
what mix of chemicles gives fireworks thier color: explain for each color
Answer:
Metal salts commonly used in firework displays include: strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks), barium chloride (green fireworks) and copper chloride (blue fireworks).
Explanation:
Answer:
Metal salts commonly used in firework displays include: strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks), barium chloride (green fireworks) and copper chloride (blue fireworks).
The colors are produced by heating metal salts, such as calcium chloride or sodium nitrate, that emit characteristic colors. ... Barium – Barium is used to create green colors in fireworks, and it can also help stabilize other volatile elements. Calcium – Calcium is used to deepen firework colors
PLS HELP ASAP I ONLY HAVE 7 min
On which of the following factors does the amount of energy absorbed by an endothermic reaction depend?
1. Number of reactants
2. Physical state of the reactant
3. Sum of the potential energy of the reactants and products
4. Difference in the potential energy of the reactants and products
Answer:
Option 3 and 4
Explanation:
In an endothermic reaction, the potential energy of the system increase. The potential energy of the reactant is less as compared to the potential energy of the products and hence additional energy is required to produce products.
The potential energy of the reactants depend on their chemical state and not the physical state. Hence, option 2 is not correct. Also, the number of reactant do not make any significant impact on the determination of potential energy of reactants. Thus, option 1 is also incorrect
The oceanic crust is destroyed at convergent boundaries because it_______________________ *
a) diverges to form a rift valley
b) goes into a subduction zone where it is melted by the hot magma
c) transforms
d) the rock crumbles at an ocean ridges
Answer: I believe the answer is d) the rock crumbles at an ocean ridges
Explanation:
which shows a disaccharide
Answer: It is :B:
Explanation: also sub to technoblade
Determine what mass of carbon monoxide and what mass of hydrogen are required to form 6.0 kg of methanol by the reaction CO(g) + 2H2(g) -> C H3OH(l)
Answer:
5250 grams or 5.25 kg of carbon monoxide and 375 grams of hydrogen are required to form 6 kg of methanol.
Explanation:
The balanced reaction:
CO (g) + 2 H₂ (g) -> CH₃OH (l)
By stoichiometry of the reaction, the following amounts of moles of each compound participate in the reaction:
CO: 1 moleH₂: 2 molesCH₃OH: 1 moleBeing the molar mass of each compound:
CO: 28 g/moleH₂: 1 g/moleCH₃OH: 32 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
CO: 1 mole* 28 g/mole= 28 gramsH₂: 2 moles* 1 g/mole= 2 gramsCH₃OH: 1 mole* 32 g/mole= 32 gramsBeing 6 kg equivalent to 6000 grams (1 kg= 1000 grams), you can apply the following rules of three:
If by stoichiometry 32 grams of methanol are formed from 28 grams of carbon monoxide, 6000 grams of methanol are formed from how much mass of carbon monoxide?[tex]mass of carbon monoxide=\frac{6000 grams of methanol*28 grams of carbon monoxide}{32 grams of methanol}[/tex]
mass of carbon monoxide= 5250 grams= 5.25 kg
If by stoichiometry 32 grams of methanol are formed from 2 grams of hydrogen, 6000 grams of methanol are formed from how much mass of hydrogen?
[tex]mass of hydrogen=\frac{6000 grams of methanol*2 grams of hydrogen}{32 grams of methanol}[/tex]
mass of hydrogen= 375 grams
5250 grams or 5.25 kg of carbon monoxide and 375 grams of hydrogen are required to form 6 kg of methanol.
balance the equation P + O2 → P4O10
Uranium is an element with three naturally occurring isotopes: 238U, 235U, and 234U. This means that 238U, which has a mass number of 238 has _______more than 235 u which has a mass number of 235.
Answer:
The correct answer is - neutrons.
Explanation:
Uranium has various isotopes found naturally that are three 238U, 235U, and 234U. Uranium has an atomic number of 92 which means there are 92 protons and 92 electrons in the atomic structure.
Isotopes have the same number of protons but a different number of neutrons that can vary from 141 to 146. U-238 has 146 neutrons in the nucleus, whereas 235 U has 143 neutrons.
The U- 238 has more neutrons than U- 235. Atomic mass is the sum total of the nucleons or protons and neutrons.
What are Isotopes?
They are the different variants of the same molecules which have the same number of protons but the different number of neutrons.
Atomic mass is the sum total of the nucleons or protons and neutrons. The atomic number of Uranium is 92, the rest of the mass comes from neutrons.
Therefore, the U- 238 has more neutrons than U- 235.
Learn more about Isotopes:
https://brainly.com/question/9099776
can someone please do the balanced equation for potassium fluoride?
Answer:
K + F2 = KF
Explanation:
Thats the balancee equation for potassium fluoride. The equation is 2K + F2 → 2KF and the balanced equation is K + F2 = KF
Andrea is making a poster to show how the nervous system uses signals to send information through the body. These signals are sent through nerves. What parts should Andrea include in her diagram of a nerve as evidence to support her explanation?
neurons only
neurons, axons, and dendrites
dendrites, blood vessels, and muscle cells
axons, blood vessels, and connective tissue
Answer:b
Explanation:
How many sigma and pie bonds are in the following compound?
1.00
on
H:0:
| ||
H-C-C-H
1
H
For the first
H : O : H
Theres two bonds here
Each other are sigma
So 2Sigma bonds present
For the Second
I believe you wanted to write Ethyne....
In a triple bond... Theres 1sigma and 2 Pi bonds
Every single bond is a sigma bond
So
Counting all
we have
2Pi bonds and 3Sigma bonds
PLEASE HELP ME!
WILL MARK BRAINLIEST
Water Cycle
Listed in the Item Bank are some important labels for sections of the image below. To find out more information about labels, some have more details available when you click on them. Drag and drop each label to the corresponding area it identifies in the image.
The one on the top left corner is condensation. The one below that is evaporation. The one below that in the water is accumulation. The one next to accumulation is ground flow. The one on the trees is transpiration. The one above transpiration is surface flow. The one above surface flow is precipitation and above precipitation it’s condensation. Lmk if you were able to get that.
differences between geometric isomerism and optical isomerism?
Geometric isomers have the same structural formulas but differ in the arrangement of groups at a single atom, at double bonds, or in rings. ... One of the optical isomers rotates the light in one direction, the other rotates the light in the opposite direction but by the same amount.
In a receptacle we have 29 g of hydrochloric acid that react with an excess of ammonia according the following equation:
HCl + NH3 → NH4Cl
The percent yield of the reaction is 54 %. Determine:
1.Mass of ammonium chloride obtained.
2.How many moles of ammonium chloride are forme
Answer:
2969429th Ave
Explanation:
i dont know
A 5.0 L sample of gas at 300. K is heated to 600. K. What will the new volume of the gas be?
Answer:
[tex]V_2=10L[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the required new volume by using the Charles' law as a directly proportional relationship between temperature and volume:
[tex]\frac{V_2}{T_2} =\frac{V_1}{T_1}[/tex]
In such a way, we solve for V2 and plug in V1, T1 and T2 to obtain:
[tex]V_2=\frac{V_1T_2}{T_1}\\\\V_2=\frac{5.0L*600K}{300K}\\\\V_2=10L[/tex]
Regards!