Answer:
E
Explanation:
Recall the Henderson-Hasselbalch equation:
[tex]\displaystyle \text{pH} = \text{p}K_a + \log \frac{[\text{Base}]}{[\text{Acid}]}[/tex]
For a pH of 5.14 with the given pKa of 4.74, solve for the ratio between acetate and acetic acid:
[tex]\displaystyle \begin{aligned} (5.14) & = (4.74) + \log\frac{[\text{CH$_3$COO$^-$}]}{[\text{CH$_3$COOH}]} \\ \\ \log\frac{[\text{CH$_3$COO$^-$}]}{[\text{CH$_3$COOH}]}& = 0.40 \\ \\ \frac{[\text{CH$_3$COO$^-$}]}{[\text{CH$_3$COOH}]} & = 10^{0.40} \\ \\ & = 2.5\end{aligned}[/tex]
In conclusion, the answer is E.
How many electrons are in the n = 2 shell of a magnesium atom?
Answer:
eight
Explanation:
That means there are 12 electrons in a magnesium atom
hope this helps
What family kept the kings of Nepal under guard and would not let them have any power.
Answer:
Gyanendra of Nepal
b. A silver ring contains 1.1 × 1022 silver atoms. How many moles of silver are in the ring?
Answer:
1124.2
Explanation:
just easy mathamatics
HELP ME OUT PLS!!!!!!!
Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is which type of galaxy?
elliptical
irregular
spiral
oval
Answer:
the spiral type of galaxy
Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy. Therefore, the correct option is option C.
What is milky way galaxy?The Milky Way constellation is indeed a huge spiral formation containing hundreds of trillions of stars, along with the Sun. the irregularly formed belt of stars and gas clouds visible from Earth that spans the sky. despite the reality that Earth is positioned within the Milky Way constellation, astronomers do not completely understand its nature, despite its proximity with other external star systems.
A dense layer of interstellar dust obscures the majority of the Galaxy from optical observatories, and astronomers can only understand its massive building with the assistance of radio and infrared telescopes, which can detect the forms of light that may travel through the obscuring material. Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy.
Therefore, the correct option is option C.
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Which of the following is not an example of an inexhaustible resource?
1.) Wind power
2.) Wave and tidal power
3.) Solar energy
4.) Biomass
Answer:
I would say 4.) Biomass
Explanation:
This looks like the best possible answer because it is plant based. Worst case scenario we could run out of plants. In comparison, wind will pretty much always be around along with wave/tidal power and solar.
This question is in my General Chem 2 class. I will give Brainlist!
Given: 8As + 12H20 —>3H2AsO4- + 3H+ + 5AsH3 What mass of arsenic is required to produce 15.0 mL of 0.0852M H2AsO4-?
A. 0.0359 g
B. 0.255 g
C. 17.0 g
D.1134 g
Answer:
B
Explanation:
From the given chemical equation, we want to determine the mass of arsenic necessary to produce 15.0 mL of 0.0852 M H₂AsO₄⁻.
Find the amount of moles present in 15.0 mL of 0.0852 M H₂AsO₄⁻ solution. Recall that M = mol/L:
[tex]\displaystyle 15.0\text{ mL} \cdot \frac{0.0852\text{ mol H$_2$AsO$_4^-$}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.00128\text{ mol H$_2$AsO$_4^-$}[/tex]
With stoichiometric ratios and molecular weights, determine the mass of arsenic necessary:
[tex]\displaystyle 0.00128 \text{ mol H$_2$AsO$_4^-$} \cdot \frac{8\text{ mol As}}{3\text{ mol H$_2$AsO$_4^-$}}\cdot \frac{74.92\text{ g As}}{1\text{ mol As}} = 0.256\text{ g As}[/tex]
In conclusion, the answer is B.
If you have 146.0 grams of HCl, how many grams of H2O can that produce?
Answer:
9 gram of H2O can be produced
What is the pH of a 0.050 M LiOH solution?
Answer:
a. <1.0
b. 1.30
c. 3.00
d. 11.00
e. 12.70
A sample of water goes through a temperature change of -74.14 °C while releasing 578.7 joules of heat. The specific heat capacity of water is 4.184 J/(g·°C). What is the mass of this sample? grams (Report your answer using 4 significant figures).
Answer:
[tex] \boxed{ \sf \: m = 1.866 \: grams}[/tex]
Explanation:
Given:
Change in temperature ∆T= -74.14°C
Heat(Energy) released Q= 578.7 joules
Specific heat capacity s = 4.184 J/(g·°C)
To find:
Mass of the sample (m)=?
Solution:
[tex] \sf s= \frac{Q}{m \cdot \Delta T} \\ \sf \: Substituting \: the \: given \: parameters \\ \sf 4.184 = \frac{578.7}{m \times ( - 74.14)} \\ \sf m = \frac{578.7}{4.184 \times ( - 74.14)} \\ \sf m = \frac{578.7}{310.20176} \\ { \sf m = 1.8655 \approx1.866 \: grams}[/tex]
Since, we need the answer in 4 significant figures,
[tex] \boxed{ \sf \: m = 1.866 \: grams}[/tex]
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An element has 25 protons and 30 neutrons. What is the correct nuclear notation for the element? Please use the Periodic Table to find the correct symbol
Answer:
It is:
55
Mn
25
3.Calculate the pH of a 0.250 M solution of potassium phenolate, KC6H5O. Ka for phenol (C6H5OH) is 1.0 x 10-10.
From the statement and the information available in the question, the pH of the solution is 12.2.
What is Ka?The term Ka refers to the acid dissociation constant of a substance, we can obtain this by setting up the ICE table as shown;
C6H5O^- + H2O ⇄ C6H5OH + OH^-
I 0.250 0 0
C -X +X +X
E 0.250 -x x x
Now;
Kb = 1 * 10^-14/ 1.0 x 10-10
Kb = 1 * 10^-4
Kb = [C6H5OH] [OH^-]/[C6H5O^-]
1 * 10^-4 = x^2/ 0.250 -x
1 * 10^-4 (0.250 -x) = x^2
2.5 * 10^-4 - 1 * 10^-4 x = x^2
x^2 + 1 * 10^-4 x - 2.5 * 10^-4 = 0
x=0.016 M
Given that; [C6H5OH] = [OH^-] =x
pOH = -log(0.016 M) = 1.8
pH = 14 - 1.8 = 12.2
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How many grams of a gas with a molar mass 36.02 g/mol would be required to occupy a 3979 mL flask at 1.07 atm and 81.7 degrees Celcius? Record your answer in scientific notation to 2 decimal spaces.
A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.
What is an ideal gas?An ideal gas is that whose behavior can be explained using the ideal gas laws.
Step 1. Convert 81.7 °C to Kelvin.We will use the following expression.
K = °C + 273.15 = 81.7 + 273.15 = 354.9 K
Step 2. Calculate the moles of the gas.We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 1.07 atm × 3.979 L / (0.08206 atm.L/mol.K) × 354.9 K = 0.146 mol
Step 3. Calculate the mass of the gas.The molar mass of the gas is 36.02 g/mol.
0.146 mol × 36.02 g/mol = 5.26 g
A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.
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Many cigarette lighters contain liquid butane, C4H10, which has a ∆H°ƒ = –147.6 kJ/mol. Using enthalpies of formation, calculate the quantity of heat produced when 1.0 g of butane is completely combusted in air. (Write the equation for the process first)
For cigarette lighters containing liquid butane, C4H10, the quantity of heat produced is mathematically given as
q= -49.2 KJ
What is the quantity of heat produced when 1.0 g of butane is completely combusted in air?Generally, the equation for the Chemical reaction is mathematically given as
C₄H₁₀(l) + 6.5 O₂(g)---->4 CO₂(g) + 5 H₂O(l)
Therefore
dH°r = .(-393.5 ) + 5.(-285.5] - [1.(-147.6 )+6.5.
dH°r = -2853.9 kJ/mol
In conclusion, No.of mole
Nm = 1g/58g/mol
Nm= 0.01724mol
Hence, Heat of combustion
q = dH°r x moles
q = -2853.9 ×0.01724
q= -49.2 KJ
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Which of the following mixtures cannot be separated by using both particle size and color as observable properties?
(A) Nickels and pennies
(B)Sand and rocks
(C) Stick and stones
(D)Salt and beans
Answer:
(A) Nickels and pennies
how many oxygen atom in 0.25 mol ca(No3)2?
Answer:
1 molecule of Ca(NO3)2 has 6 oxygen atoms.
How many Calories are contained in one tablespoon of palm oil, which has 45.3 g of fat? [Hint: One
gram of protein or one gram of carbohydrate typically releases about 4 Calg, while fat releases 9
Cal/g.] Report your answer to 1 significant figure.
Answer:
120 calories
Explanation:
Calories and nutrition for world population. One tablespoon of palm oil has 120 calories and 13.6 grams of fat. What does it tell you? Of the 13.6 grams of fat in a tablespoon of palm oil, 6.7 grams are saturated and 6.3 grams are unsaturated.
Define, giving examples of
Binary ionic Compound:
Answer:
A binary ionic compound contains an ion that is a metal (cation) and an ion that is a nonmetal (anion).
Explanation:
Tell me if its wrong
If you have 2m of hydrochloric acid and also 2m of vinegar which one is weak and strong and why?
What pressure is exerted by 901.3 g of CH4 in a 0.690 L steel container at 185.7 K
Ideal gas law: PV = nRT
Write down what you know and what you want to fine:
P = pressure = ?
V = volume in liters = 0.950 L
n = moles = 727.2 g x 1 mol CH4 / 16 g = 45.45 moles
R = gas constant = 0.0821 Latm/Kmol
T = temperature in K = 221.9K
Solve for P:
P = nRT/V = (45.45)(0.0821)(221.9) / 0.950
P = 872 atm (3 sig. figs. based on 0.950 L having 3 s.f.)
Insoluble sulfide compounds are generally black in color. Which of the following combinations could yield a black precipitate? a) Na2S(aq) + KCl(aq) b) Li2S(aq) + Pb(N03)2(aq) c) Pb(C103)2(aq) + NaNO3(aq) d) AgNo3(aq) + KCl(aq) e) K2S(aq) + Sn(N03)4(aq)
Answer:
b) Li2S(aq)+Pb(NO3)2(aq)
e) K2S(aq)+Sn(NO3)4(aq)
Explanation:
they are the only two of the options that contain a sulfide ion (S) therefore they are the only ones that could be considered in the question.
b) Li2S(aq)+Pb(NO3)2(aq)
e) K2S(aq)+Sn(NO3)4(aq)
what is joule ?
a. time
b. mass
c. volume
d. length
e. none
Explanation:
It is the unit of work or energy
19. Which reaction will form a salt and water?
Aa precipitation reaction
Ba displacement reaction
Can acid-base neutralization
Dan ionic dissociation reaction
Answer:
acid-base neutralization
Explanation: When a base and acid react, it neutralizes the substance making it a neutral substance, which is water and a salt
Which subshells (s, p, d, f, or g) can have electrons with the indicated magnetic quantum number (ml)?
Answer:
=3 means is 3 or greater so that would be f and g subshells
=0 means is 0 or greater so that would be s, p, d, f and g subshells
=1 means is 1 or greater so that would be p, d, f, and g subshells
=4 means is 4 or greater so that would be g only
1. Nene geese in Hawaii are endangered because of
O pollution exotic species
O poaching
O habitat destruction
Answer:
✔ habitat destruction
Explanation:
the 3 reasons are:
hunting
habitat loss
introduced predators
summed up its habitat destruction
Which pictures shows the proper structure of the water molecule? Click the picture to see each choice.
The third picture is the answer
Explanation:
there are 2 hydrogen atom 1 oxygen
How do I solve this
Answer:
try doing a math problem it may help
Explanation:
How many oxygen atom in 0.25 mol ca(No3)2
Answer: I believe its 1 but i'm not sure
Explanation:
How many moles of CO2 will be produced in the following reaction if the initial amount of reactants was 0.50 moles?
2NaHCO3 —> Na2CO3 + CO2 + H2O
Answer:
In the following reaction, how many moles of
CO2
can be made by reacting 0.50 moles of
CH4
with excess oxygen?
CH4+O2>CO2+H2O
Explanation:
PLEASE HELP 50 POINTS NO ROBOTS OR I WILL REPORT Which functional group does the molecule below contain?
H
H-C-C
H
H
O A. Ether
O B. Amino
O C. Hydroxyl
• D. Carbonyl
Answer:
D. carbonyl
Explanation:
A C=O group is present, otherwise known as a carbonyl groupHow do you think life on Earth would be different without the evolution of angiosperms? Provide two examples, each with an explanation.
PLSSS HURRRYYY!!!!!! WILL GIVE BRAINLIEST!!!
Answer:
Without angiosperms, average annual rainfall in the area declined by 300 millimeters. In the eastern Amazon basin, the length of the wet season decreased by nearly 3 months. The extent of the wettest rainforests, which receive more than 100 millimeters of rain per month, shrank by 80%.