Answer: pH ≈ 3.186
Explanation:
[tex]p^{H} &=p^{k a}+\left[\frac{A^{-}}{H A}\right] \\3.26 &=p^{k a}+ \log \frac{0.37}{0.34} \\3.26 &=p^{k a}+\log\ 1.089 \\3.26 &=p^{k e}+0.037 \\p^{k a} &=3.26-0.1105 \\p^{k a} &=3.1495[/tex]
[tex]$0.34 \frac{\mathrm{mol}}{2} \times 0.71 \mathrm{~L}=0.2414 \ {\mathrm{mol} \rightarrow HA \\\\[/tex]
[tex]$0.37 \frac{\mathrm{mol}}{2} \times 0.71 \mathrm{~L}=0.2627 \ {\mathrm{mol} \rightarrow A^{-} \\\\[/tex]
[tex]$0.2414-0.032 \mathrm{mol}=0.2094 \mathrm{\ mol} \ HA[/tex]
[tex]$0.2627+0.032 \mathrm{mol}=0.2947 \mathrm{\ mol} \ A^{-}[/tex]
[tex]\begin{aligned}&p H=3.1495+\log\frac{0.2627}{0.2414} \\&p H=3.1495+0.0367 \\&p H=3.186\end{aligned}[/tex]
Therefore, the pH after 0.032 mol of HCl are added to 0.71 L of the solution is approximately 3.186
The ________________and ______________ of magma cause igneous rocks to form.
A: melting and cooling
B: cementation and compaction
C: weathering and erosion
D: heat and pressure
Answer:
option B
cementation and compaction
What is the measurement of 2 polar bears
Answer:
An adult male is between 2.4-3m (8-10 feet) in size and weighs between 350-680kg (775-1500lbs). Females are slightly smaller at around 1.8-2.4m (6-8 feet) and weigh between 150-250kg (330-550lbs).
When heated, KClO3 decomposes into KCl and O2. 2KClO3⟶2KCl+3O2 If this reaction produced 17.4 g KCl, how many grams of O2 were produced? maSS
Answer:
12.6 g O2 or
12.60 g O2 (if needed two decimal places)
Explanation:
First convert grams into moles:
17.4 g KCl × 1
74.55
= 0.233 moles of KCl
Next solve for the mole of O2:
= 0.233 × 3 moles of O2
2 moles of KCl
= 0.3495 or
= 0.350 moles of O2
Finally convert the mole to grams:
= 0.350 moles of O2 × 36g
1 mole
= 12.6 g O2 or 12.60 g O2
Answer:
a car traveled 20m &400k/g
what would happen if you put vegetable oil and ice cubes into a beaker together? what would happen if you left it on the counter overnight?
Volume of distillate = 300 ml
Volume of Ethanol in the mixture = 450 ml
% Recovery =
Based on the distillation data provided, the percent recovery of ethanol is 66.7%
What is distillation?Distillation is a separation technique which is used to separate two miscible liquids based on differences in their boiling points.
At the boiling point of the first liquid, it distills over and is obtained by condensation.
The liquid obtained is known as distillate.
In the distillation of ethanol, the percent recovery is calculated as follows:
Percent recovery = (volume of distillate/volume of ethanol in mixture) × 100%From the data given:
Volume of distillate = 300 mlVolume of Ethanol in the mixture = 450 mlPercent Recovery = (300/450) × 100%
Percent recovery = 66.7%
Therefore, the percent recovery of ethanol is 66.7%.
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The ________________and ______________ of magma cause igneous rocks to form.
Answer:
The solidifying/cooling and crystallizing of magma causes igneous rocks to form.
How many grams are in 1.23 x 1020 atoms of arsenic?
Given the data from the question, the mass of arsenic that contains 1.23×10²⁰ atoms is 0.0153 g
Avogadro's hypothesis6.02×10²³ atoms = 1 mole of arsenic
But
1 mole of arsenic = 75 g
Thus, we can say that:
6.02×10²³ atoms = 75 g of arsenic
How to determine the mass that contains 1.23×10²⁰ atoms6.02×10²³ atoms = 75 g of arsenic
Therefore,
1.23×10²⁰ atoms = (1.23×10²⁰ × 75) / 6.02×10²³ atoms)
1.23×10²⁰ atoms = 0.0153 g of arsenic
Thus, 1.23×10²⁰ atoms is present in 0.0153 g of arsenic
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if you add 3 mL of water to 1 ml of nadh mix and get an observance of 0.2 what is the concentration of the original nadh solution
Answer:
you are looking at the official nkana fc website
Consider the reaction.
A(aq)↽−−⇀2B(aq)=4.87×10−6 at 500 K
If a 2.00 M sample of A is heated to 500 K, what is the concentration of B at equilibrium?
Note the signs of equilibrium:-
Reaction don't procede forward or backwardConcentration of products and reactants remains same .So
if
Concentration of A is 2M then concentration of B should be same .
So equilibrium constant K is 1
[tex]\\ \rm\rightarrowtail K=\dfrac{[Products]^a}{[Reactants]^b}[/tex]
So
[B]=[A]^2[B]=2^2[B]=4MThe equilibrium constant K is the ratio of product of molar concentrations of products to the product of molar concentrations of reactants. The concentration of B in the given reaction is 0.0031 M.
What is rate of a reaction?Rate of a reaction is the rate of decrease in the concentration of the reactants or rate of increase in the concentration of products.
Consider the simple reaction A ⇄2B, the rate of the reaction can be written as follows:
rate = K [A]
Where, k is the equilibrium constant or rate constant and [A] is the concentration of reactant A. If A have any coefficients, then the coefficient number is written as power of the concentration term.
The equilibrium constant K = [B]²/ [A] it is given 4.87 ×10⁻⁶ . Thus concentration of B can be calculated as follows:
[B]² = K [A]
= (4.87 ×10⁻⁶)×2.00 M
=9×10⁻⁶
[B] = 0.0031 M
Hence, the concentration of the product B is 0.0031 M.
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give the structure of chlorocyclohexane.
don't spam :)
thankyou ~
Answer:
Explanation:
This is not my photo. I got it from this website.
https://pubchem.ncbi.nlm.nih.gov/compound/Chlorocyclohexane#section=2D-Structure
Arrange the following acids from strongest to weakest:
HF, HBr, HCl, HI
Answer:
HI>HBr>HCL>HF
Explanation:
Calculate the pH of a hydrochloride acid solution, HCl, whose hydronium ion (H3O)+ concentration is 8.29 X 10-4 M.
Note: answer should have three significant figures
Answer:
Explanation:
Calculate the pH of a hydrochloride acid solution, HCl, whose hydronium ion (H3O)+ concentration is 8.29 X 10-4 M.
Note: answer should have three significant figures
How many grams of aluminum oxide will you need to start with in order to make 6500 g of aluminum hydroxide?
Answer:
Explanation:
2Al(s) + 3 2 O2(g) → Al2O3(s) And given the stoichiometry ...and EXCESS dioxygen gas...we would get 6.25⋅ mol of alumina. the which represents a mass... ...6.25 ⋅ mol ×101.96 ⋅ g ⋅ mol−1 molar mass of alumina ≡ 637.25 ⋅ g.
Answer:
56.7 grams of aluminum oxide (AI²O³) are produced.Need a fast expert's response.
A chemist adds 36.0 g of sodium chloride to 200 g of water at STP and all of the sodium chloride dissolves. What is the solute in this scenario?
Answer:
The answer is the Sodium Chloride.
Explanation:
A solute is the minor component in a solution, dissolved in the solvent, and the sodium is being dissolved in water ( or the solvent).
A chemist adds 36.0 g of sodium chloride to 200 g of water at STP and all of the sodium chloride dissolves, in this scenario sodium chloride is solute.
What are solute?Those substance which are present in the solution relatively in less amount is known as solute.
In the question given that 36 grams of sodium chloride is added in the 200 grams of water. From this it is clear that sodium chloride is a solute and water is a solvent, which additionally makes a solution.
Hence, sodium chloride is a solute.
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What is the chemical name of the covalent compound SF6?
Answer:
The name of it is Sulfur Hexafluoride
Explanation:
Bonus fact: It is over 5 times heavier than air so when inhaling it, it makes your voice go very deep. The opposite of helium some would say
Determine whether aqueous solutions of the following salts are acidic, basic, or neutral: (a) Al(NO3)3 (b) RbI (c) KHCO2 (d) CH3NH3Br
The aqueous solution and their respective properties include the following:
Al(NO3)3 - acidicRbI - neutralKHCO2 - basic CH3NH3Br - acidicWhat is pH?This is defined as the degree of acidity or alkalinity of a substance and pH from 1.0 - 6.9 is acidic, 7 is neutral while 7.1 - 14.0 is basic.
The aqueous solutions and their appropriate pH can be seen above which is the right choice.
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Balance the equation
How many grams of FeCo3 will be produced from 57.2g FeCl2
Answer:
287.30 g of FeCO₃
Solution:
The Balance Chemical Equation is as follow,
FeCl₂ + Na₂CO₃ → FeCO₃ + 2 NaCl
Step 1: Calculate Mass of FeCl₂ as,
Molarity = Moles ÷ Volume
Solving for Moles,
Moles = Molarity × Volume
Putting Values,
Moles = 2 mol.L⁻¹ × 1.24 L
Moles = 2.48 mol
Also,
Moles = Mass ÷ M.Mass
Solving for Mass,
Mass = Moles × M.Mass
Putting Values,
Mass = 2.48 mol × 126.75 g.mol⁻¹
Mass = 314.34 g of FeCl₂
Step 2: Calculate Mass of FeCO₃ formed as,
According to equation,
126.75 g (1 mole) FeCl₂ produces = 115.85 g (1 mole) FeCO₃
So,
314.34 g of FeCl₂ will produce = X g of FeCO₃
Solving for X,
X = (314.34 g × 115.85 g) ÷ 126.75 g
X = 287.30 g of FeCO₃
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Calculate the % by mass concentration for each of the following solutions. Match the answers.
1.25g NaCl in 100.0g of solution = [a]%
ce
2.50g K2Cr2O7 in 96.0g of solution = [b]%
nts
10.0g CaCl2 in 250.0g of solution = [c]%
ns
20.0g Kl in 100.Ogof solution = [d]%
The percentage by mass of each of the compounds would be 40%, 2.6%, 4%, and 20% respectively
Percentage by massThe percentage by mass of a substance is given by:
Percent by mass = mass of substance/mass of solution x 100%.
For NaCl: Percent by mass = 25/100 = 40%For K2Cr2O7: Percent by mass = 2.50/96 = 2.6%For CaCl2: Percentage by mass = 10/250 = 4%For KI: Percent by mass = 20/100 = 20%More on percentage by mass can be found here: https://brainly.com/question/27108588
There are two varieties in a population of squirrels: short tails and long tails. Long-tailed squirrels are better at jumping and balancing in trees. Scientists observe that over the span of 100 years, the proportion of the population with long tails increases from 10% to 60%. Which statement is most likely? (1 point)
The proportion of long-tailed squirrels may have increased due to a decrease in trees.
The proportion of short-tailed squirrels may have decreased due to an increase in trees.
The proportion of short-tailed squirrels may have decreased due to decreased food availability.
The proportion of long-tailed squirrels may have increased due to increased food availability.
The proportion of long-tailed squirrels may have increased due to increased food availability.
The statement has it that the percentage of long tailed increased also that the long tailed are better at jumping and balancing on trees.
The first option could is tempting but saying decrease in trees would not likely support the argument.
The last option has more sound options as more food availability may lead to population increment
Hope it helps....
Which pictures show the car at zero acceleration? A. Picture 1 only. B. Pictures 1 and 3. C. Picture 2 and 4. D. Picture 4 only.
Picture 1 shows choice B
Explanation:
picture 1 shows the car to which the net force is a zero
How can we increase the surface area of reactants?
add a catalyst
O place them in a flame
dissolve them in water
o add more particles to the solution
Answer:
O place them in a flame dissolve them in water o add more particles to the solution.
2. Water vapor in the atmosphere is the source of
Answer:
Warmth (in addition to sunlight) at the Earth's surface.
Explanation:
Heat radiated from Earth's surface is absorbed by water vapor molecules in the lower atmosphere. The water vapor molecules, in turn, radiate heat in all directions. Some of the heat returns to the Earth's surface. Thus, water vapor is a second source of warmth (in addition to sunlight) at the Earth's surface.
two or more substances combine to form a single new substance
Answer:
Combination reactions
Explanation:
Hope this helps:)
what are the states of matter for the following equation?
6Br⁻ + XeO₃ + 6H⁺ → 3Br₂ + Xe + 3H₂O
Answer:
Explanation:
On the reactant side, XeO3 is a strong oxidizing agent. It can be a solid or gas. Most likely it is in a solid state.
H+ and Br- combine to form HBr which is a weak acid. So H+ and Br- are in an aqueous state.
On the product side, both Br2 and Xe are not very soluble in water. They will be in gaseous state and H2O is water i.e. liquid state.
Which statements describe the motion of the object represented by the graph? Select three options.
The object is moving away from the origin.
The object is moving towards the origin.
The object started at the origin.
The object started at 2 meters.
The object is traveling at a constant velocity.
Answer:
The object is moving away from the origin.
Explanation:
Answer:
The object is moving away from the origin
The object started at 2 meters.
The object is traveling at a constant velocity.
Explanation:
The line on the graph is moving in the upward direction which means the farther right on the graph you go the farther up the line is. The line also has a constant slope which indicates that the object is moving at a constant rate. and if you look at x=0 the y=2 so therefor the object started at 2 meters.
I will give 500 points! What is the composition of Milk?
Answer:In general, the gross composition of cow's milk in the U.S. is 87.7% water, 4.9% lactose (carbohydrate), 3.4% fat, 3.3% protein, and 0.7% minerals (referred to as ash).
Explanation:
i got it ccorerct
Answer:
The milk of goats and sheep is similar in composition to that of cows.
Milk protein consists mainly of casein, and it exists in several classes: α, β, etc. If milk pH falls below 4.6, the casein precipitates. Although casein represents 80–85% of total milk protein, when precipitation occurs, the liquid portion is referred to as whey.
The remaining proteins are found in whey, and they include serum albumin, immunoglobulins, α-lactalbumin, etc. Milk carbohydrate is lactose, and its content is fairly consistent among breeds of milk cows at around 5.0%.
lactose is the main sugar; smaller quantities of glucose and citric acid exist. The fat content varies between ca. 3.5 and 5.0% depending upon cattle breed.
The ash content of around 0.7% consists of a relatively high level of Ca2+ and a lower level of Fe2+.
The pH of fresh whole milk is around 6.6 but it may reach ca. 6.8 from a cow that has mastitis.
Mastitis is an infection of the udder that is most often caused by Streptococcus agalactiae and S. Uberois but sometimes by Staphylococcus aureus or Streptococcus dysgalactiae.
Fresh milk of mastitis cows mainly has leucocytes (white blood cells) >106/ml as compared to nonmetastatic milk which has 70,000/ml leucocytes.
Milk contains a very adequate supply of B vitamins with pantothenic acid and riboflavin being the two most abundant. Vitamins A and D are added for human consumption, and their presence has no known effect on the activity of microorganisms.
Overall, the chemical composition of whole cow’s milk makes it an ideal growth medium for heterotrophic microorganisms, including the nutritionally fastidious Gram-positive lactic acid bacteria. However, the milk microbiota utilizes these constituents and brings about its spoilage.
Ozone has a molecular formula of O3. If 7.92*1024 atoms of oxygen react to form ozone, how many
moles of ozone would be produced?
337.92 moles of Ozone will be produced
1 Oxygen atom is 8 g
1 mole of ozone, O3 = 8 * 3 = 24 g
7.92 * 1024 = 8110.08 g
1 mole = 24 g
? moles = 8110.08 g
? = 337.92 moles
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Ozone has a molecular formula of O3. If 7.92*1024 atoms of oxygen react to form ozone, then 337.92 moles of ozone will produce.
What is molecular formula?Molecular formula is defined as an expression that defines a number of atoms of each element in one molecule of a compound.
It can also be defined as a chemical formula that gives the total number of atoms of each elements in each molecules of a substance.
Ozone is defined as a highly reactive gas composed of three oxygen atoms and form a layer above the earth surface called as ozone layer.
1 oxygen atom = 8 g
1 mole of ozone = 8 x 3 = 24 g
7.92 x 10²⁴ = 8110.08 g
24 g = 1 mole
So, 8110.08 g = 337.92 moles
Thus, Ozone has a molecular formula of O3. If 7.92*1024 atoms of oxygen react to form ozone, then 337.92 moles of ozone will produce.
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A sample of PH3, occupying 1.50 L at 25 oC and 0.80 atm, reacts with 0.080 atm, reacts with 2.28L of O2 at 20.0 oC and 0.100 atm according to the following equation:
4 PH3(g) + 8 O2(g) => P4O10(s) + 6 H2O(g)
How many grams of each product is produced? How many grams of each reactant are left at the end of the reaction? What is the final pressure at the end of the reaction? (The final volume is 3.88L and the final temperature is 22.5C).
The ideal gas equation can be used to obtain the pressure, number of moles, volume and temperature of a gas.
What is the ideal gas equation?The ideal gas equation gives the relationship between pressure, number of moles, volume and temperature.
To obtain the number of moles of PH3
PV = nRT
n = PV/RT
n = 0.80 atm * 1.50 L/0.082 atmL/Kmol * 298 K
n = 0.049 moles
Number of moles of O2
PV = nRT
n = PV/RT
n = 0.100 atm * 2.28L /0.082 atmL/Kmol * 293 K
n = 0.0095 moles
Fom the reaction equation;
4 moles of PH3 reacts with 8 moles of O2
0.049 moles of PH3 reacts with 0.049 moles * 8/4 moles
= 0.098
Hence O2 is the limiting reacatant.
Mass of P4O10 produced =
8 moles of O2 yields 1 mole of P4O10
0.0095 moles of O2 yields 0.0095 moles * 1 mole/8 moles
= 0.0012 moles
Mass of P4O10 = 0.0012 moles * 284 = 0.34 g
Mass of water;
8 moles of O2 yields 6mole of water
0.0095 moles of O2 yields 0.0095 moles * 6 moles/8 moles
=0.0071 moles
Mass of water = 0.0071 moles * 18 g/mol = 0.13 g
Since 4 moles of PH3 reacts with 8 moles of O2
x moles of PH3 reacts with 0.0095 moles of O2
x = 0.0048 moles
Moles of PH3 left over = 0.049 moles - 0.0048 moles = 0.0442 moles
Mass of PH3 left over = 0.0442 moles * 34 g/mol
= 1.5 g
No mass of O2 is left over because the limiting reactant is used up.
Total moles of gas left after the reaction = 0.0442 moles + 0.0071 moles = 0.0513 moles
P = nRT/V
P = 0.0513 moles * 0.082 atmL/Kmol * 295.5/3.88L
P= 0.32 atm'
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Before tackling this problem, be sure you know how to find the antilog of a number using a scientific calculator.
A solution has a pH of 5.4. Write the formula you will use to calculate the [H+] and then show all your work leading to the determination of [H+].
A solution has a pH of 5.4, the determination of [H+].
Given :- pH:- 5.4 pH = - log[H+]To find :- concentration of H+Answer:- Antilog(-5.4) or 4× 10-⁶Explanation:- Formula:- pH = -log H+Take negative to other side
-pH = log H+
multiple Antilog on both side
(Antilog and log cancel each other )
Antilog (-pH) = [ H+ ]
New Formula :- Antilog (-pH) = [+H]
Now put the values of pH in new formula
Antilog (-5.4) = [+H]
we can write -5.4 as (-6+0.6) just to solve Antilog
Antilog ( -6+0.6 ) = [+H]
Antilog (-6) × Antilog (0.6) = [+H]
[tex]Antilog (-6) = {10}^{ - 6} , \\ Antilog (0.6) = 4 [/tex]
put the value in equation
[tex] {10}^{ - 6} \times 4 = [H+] \\ 4 \times {10}^{ - 6} = [H+][/tex]