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Gabriella
Questions and answers by visitors named
Gabriella
Questions (106)
Given the Na+/Na and K+/K half-cells, determine the overall electrochemical reaction that proceeds spontaneously and the E0
7 answers
4,134 views
A given weak acid HZ has a Ka=1.7×10−6.
What is the H3O+ concentration of a solution of HZ that has a concentration of 0.78
7 answers
2,613 views
Calculate the concentration of Hg2+ ions in a saturated solution of HgS(s). (Ksp=1.7×10^52)
Answer in units of mol/L What volume
3 answers
1,040 views
The rate of effusion of unknown gas X is found to be about 1.5 times that of SF6 gas (MW=146 g/mol) at the same conditions of
4 answers
1,469 views
Use the Clausius-Clapeyron equation to calculate the temperature at which pure water would boil at a pressure of 367 torr. The
4 answers
983 views
Why do countries want to be the most powerful? What is it they can control once they have reached that status?
They can control
1 answer
1,044 views
an increase in aggregate demand when the economy is isolating in high levels of output will result in what?
if anyone knows id be
5 answers
410 views
Waht kind of music do they listen to in Thailand? I'm doing a project about Thailand and as an idea, I thought of either playing
3 answers
8,405 views
determine your distance traveled and displacement if you walk 100m foward than 35m
1 answer
214 views
an 8-newton foce is applied to a 4-kg object. what is the rate of acceleration. a.4 meters per second
b.8 meters per second c.2
2 answers
888 views
(16x - 4y) - 10x + 5y)
1 answer
342 views
:'( Please help me....?
(7 points) 2. Contrast the metric units of distance, time, and speed. Describe the relationship between
2 answers
712 views
Contrast the metric units of distance, time, and speed. Describe the relationship between them.
1 answer
370 views
Using a dictionary look up and then list four definitions of the word nice that you would use in a paragraph to develop this
2 answers
637 views
a) A linear function f(t)=b + mt has a slope of -4 and vertical intercept of 20. Find its equation.
b) An exponential function
1 answer
498 views
convert y=x^2+9x+14 to factored form
2 answers
952 views
what is the product of 2x and (x2 + 7x -8.
1 answer
258 views
A 12 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to
3 answers
459 views
An ore contains Fe3O4 and no other iron. The iron in a 36.5-gram sample of the ore is all converted by a series of chemical
7 answers
1,929 views
A 28.4858 g sample of impure magnesium carbonate was heated to complete decomposition according to the equation
MgCO3(s)→MgO(s)
4 answers
2,958 views
Sulfuric acid (H2SO4)is prepared commercially from elemental sulfur using the contactprocess. In a typical sequence of
3 answers
1,213 views
An ore contains Fe3O4 and no other iron. The iron in a 40.93 gram sample of the ore is all converted by a series of chemical
3 answers
572 views
The reaction of 5.3 grams of fluorine with
excess chlorine produced 4.6 grams of ClF3. What percent yield of ClF3 was obtained?
2 answers
824 views
A 40.3 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3.
5 answers
808 views
How many milliliters of a 0.62 M HCl solution are needed to react completely with 4.7 g of zinc to form zinc(II) chloride?
Answer
2 answers
985 views
We add excess Na2CrO4 solution to 68.0 mL of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has
4 answers
1,763 views
Listerine mouthwash is 21.6% ethyl alcohol by volume. What mass of ethanol is contained in 20.0 mL of mouthwash? (The density of
3 answers
949 views
An unknown amount of water is mixed with
350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is
4 answers
2,225 views
What volume of water was added to the 350
mL of NaOH solution? Assume volumes are additive. Answer in units of mL
4 answers
1,216 views
Write the half reactions and the balanced equation for the galvanic cell
Hg(ℓ)|Hg2+2(aq)||MnO4(aq),Mn2+(aq),H+(aq)|Pt(s). What
4 answers
1,487 views
redox reaction:
Hydrogen peroxide is added to an acidified solution of potassium permanganate. what is the total redox reaction?
2 answers
1,045 views
Calculate the standard cell emf for galvanic cells with the cell reaction
2H2(g) + O2(g)→2H2O(ℓ)in acidic solution. Answer in
4 answers
3,096 views
What is the standard reaction free energy if the standard cell emf is 1.23?
Faraday’s constant is 96485 C/mol. Answer in units
2 answers
771 views
For the reduction of Cu2+by Zn, ∆G◦=−212 kJ/mol and E◦= +1.10 V. If the
coefficients in the chemical equation for this
4 answers
1,869 views
Pb(s)|PbSO4(s)|SO2−4(aq,0.60 M)||H+(aq,0.70 M)|H2(g,192.5 kPa)|Pt. If E◦for the cell is 0.36 V at 25◦C, write
the Nernst
2 answers
1,158 views
Find the equilibrium constant for the reaction Cr(s) + Zn2+(aq)→Cr2+(aq) + Zn(s) if the standard cell emf is −0.76 V at the
4 answers
3,828 views
A total charge of 96.5 kC is passed through an electrolytic cell. What mass of silver metal will be produced from a silver
4 answers
1,266 views
A total charge of 96.5 kC is passed through an electrolytic cell. What mass of copper will be produced from a copper(II)
2 answers
532 views
assuming a density of 1.0 g/mL, calculate the molarity and mole fraction of 3.0% h2o2
4 answers
2,318 views
a student titrates three samples of 0.3% hydrogen peroxide solution made from a bottle of 3% hydrogen peroxide solution dated
4 answers
1,888 views
A typical bathtub can hold 93 gallons of
water. Calculate the mass of natural gas that would need to be burned to heat the water
6 answers
1,066 views
Convert 8.3×10^5 cal to kiloJoules
1 answer
352 views
How much work is done by the system when
2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 9.6 liters against a
6 answers
1,442 views
The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 6.5 grams of manganese
4 answers
1,945 views
The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 6.4 grams of man- ganese
4 answers
7,720 views
Calculate ∆G0 for the following reaction.
4XY + 3Z2−→2Z3X2+ 2Y2 Substance ∆H0f S0kJ/mol J/mol·K XY 205.0 75.0 Y2 −82.0
5 answers
4,812 views
Calculate the entropy change when 4.44g of H2 reacts with O2 according to the reaction
2H2(g) + O2(g)→2H2O(ℓ) at 298 K and 1
2 answers
699 views
This temperature represents the freezing
point of ethanol. (Which means delta G = 0) What is the entropy change for the
2 answers
541 views
Calculate the standard entropy change for the dimerization of NO2: 2NO2(g)→N2O4(g)at 298 K, if
S◦ ∆H◦f J/K·mol �NO2(g)
4 answers
4,227 views
A circular swimming pool has radius of 15 feet. The family that owns the pool wants to erect a circular fence that is 5 feet
4 answers
2,777 views
What is the activation energy Ea for this reaction?
Answer in units of kJ The deltaH is 160 kJ X is at 160 (beginning of
1 answer
372 views
The equilibrium constant Kp is 5.00×10^17 at 25◦C for the reaction C2H4(g) + H2(g)<->C2H6(g). From this information,
4 answers
1,844 views
Analysis of a reaction mixture showed that it had the composition 0.43 mol/L N2, 0.541 mol/L H2, and 0.124 mol/L NH3 at 800 K,
5 answers
1,121 views
The equilibrium constant for thermal dissociation of F2
F2(g)<->2F(g) is 0.300. If initially 1.00 mol F2 is placed in a 1.00 L
2 answers
1,141 views
At a certain temperature, the equilibrium constant Kc is 0.154 for the reaction 2SO2(g) + O2(g)<-> 2SO3(g)
What concentration of
3 answers
820 views
At 350 K, Kc= 0.142 for the reaction
2BrCl(g)<-> Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal
1 answer
809 views
The equilibrium constant for the reaction
PCl3(g) + Cl2(g)<-> PCl5(g) is 35000 at 760◦C. At equilibrium, the partial pressure
2 answers
948 views
A mixture consisting of 1 mol of H2O(g) and 1 mol CO(g) is placed in a 11 L reaction vessel at 800 K. At equilibrium, 0.422 mol
2 answers
1,008 views
The system CO2(g) + H2(g)<->H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00
3 answers
668 views
A solution of AgI contains 1.2 mol/L Ag+. Ksp of AgI is 8.3×10^17. What is the maximum I− concentration that can exist in
2 answers
1,007 views
Calculate the solubility product constant for calcium carbonate, given that it has a solubility of 5.3×10^7 g/L of water.
2 answers
540 views
What is the value of Ksp for Ag2SO4
if 5.70 g is soluble in 1.00 L of water?
1 answer
935 views
The ionic substance T3U2 ionizes to form
T2+ and U3− ions. The solubility of T3U2 is 4.07×10−20 mol/L. What is the value of
1 answer
972 views
The pH of a solution of hydrochloric acid is 1.67. What is the molarity of the acid?
Answer in units of mol/L
2 answers
633 views
Like all equilibrium constants, Kw varies somewhat with temperature. Given that Kw is 7.51×10−13 at some temperature, compute
3 answers
1,475 views
Consider the ionization constants
cyanic acid (HOCN) : Ka= 3.5×10−4; ammonia (NH3): Kb= 1.8×10−5. A solution of ammonium
5 answers
3,475 views
What is the pH of a 0.41 M solution of pyridinium chloride (C5H5NH+Cl−)? (Kb for pyridine is 1.5×10−9.)
Answer in units of
4 answers
5,423 views
A 0.00100 M solution of a weak acid HX is 6% ionized. Calculate Ka for the acid.
4 answers
3,311 views
3(x-2)^4=24
1 answer
313 views
Cube root (x+8)-6=-2
1 answer
428 views
Which one of the following compounds is not a salt?
1. Ca(ClO4)2 2. Fe(NO3)3 3. Cr(OH)3 4. Na2SO3 5. KMnO4
4 answers
2,049 views
50.0 mL of an HCl solution with a pH of 3.5 neutralizes 200.0 mL of a Ca(OH)2
solution. What is the molarity of the Ca(OH)2
2 answers
919 views
How many moles of NaOH will it take to neutralize 0.77 L of 0.81 M HCl?
Answer in units of mol
2 answers
657 views
A 65 mL sample of a solution of sulfuric acid is neutralized by 46 mL of a 0.14 M sodium hydroxide solution. Calculate the
2 answers
603 views
If 400 mL of 3.2 molar HCl solution is added to 300 mL of 2 molar NaOH solution, what will be the molarity of NaCl in the
3 answers
1,206 views
If 435 mL of 2.7 molar HCl solution is added to 128 mL of 3.2 molar Ba(OH)2
solution, what will be the molarity of BaCl2 in the
2 answers
552 views
what is the pKa of an acid that has a pH of 7.4 at neutralization and has to have 25 mL added to neutralize it
1 answer
394 views
To what temperature must a sample of helium gas be cooled from 110 degrees C to reduce its volume from 4.9 L to 0.7 L at
3 answers
1,530 views
Nitroglycerin is a shock-sensitive liquid that detonates by the reaction
4C3H5(NO3)3(ℓ)-> 6N2(g)+10H2O(g)+12CO2(g)+O2(g)
2 answers
760 views
What pressure would a mixture of 3.2 grams of O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 4.1
3 answers
1,092 views
A 2.8 gram sample of a gaseous substance
occupies 12 L at 47 degrees C and 683 torr. What is the density of the gas under these
2 answers
902 views
We observe that 5 grams of a gaseous com-
pound occupies 2083 mL at 50 degrees C and 574 torr. What is the molecular weight of
2 answers
490 views
Iron pyrite (FeS2) is the form in which much of the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron
4 answers
1,448 views
We drop 30 grams of magnesium into 770 mL of a 4 M HCl solution. What is the maximum volume of dry hydrogen that could be
1 answer
688 views
Part 1 of 3:
An apparatus consists of a 2 L flask containing nitrogen gas at 30 degrees C and 758 kPa, joined by a valve to a 11
4 answers
1,235 views
A 1277 mL sample of nitrogen (N2) was collected by displacement of water at 24 degrees C under a total barometric pressure of
4 answers
2,203 views
Benzene is a hydrocarbon that is commonly used as a commercial solvent. However, it is carcinogenic; i.e., accumulations in the
2 answers
786 views
The cruising speed of an airplane is 150 mph. You plan to hire the plan for a 3 hour sightseeing trip. You instruct the pilot to
2 answers
670 views
1.)Identify the underlined place in the decimal number 83.5 8 41.Round the number to that place.
a.)thousandths;83.58
14 answers
1,432 views
4.)Which word or phrase is closest in meaning to the word unanimous?
a.)justifies b.)in agreement c.)divided d.)not accurate
25 answers
2,966 views
Use the formula d = rt. Find t for r = 46.6 m/h and d = 456.68 m. Show your work.
This question is not multiple choice
7 answers
1,642 views
A car moves from rest with a constant acceleration of 4m/s squared for 5s .IT then continues with the speed attained for10s and
2 answers
709 views
The average daily high temperatures in Lawton are approximately normally distributed with a mean of 58 degrees and a standard
2 answers
637 views
A mile is 5280 feet. Between which two integers is the elevation in miles?
5 answers
1,518 views
if a car is moving at some speed and then goes twice as far, would the braking distance be twice as far? yes or no? explain
1 answer
410 views
The centripetal force of an object moving around a circle varies directly with the square of the speed and inversely as the
4 answers
1,048 views
A piece of machinery valued at $30,000 depreciates at a rate of 10% yearly. How long will it take for it to reach a value of
2 answers
798 views
A shopper keeper sold a total of 15 boxes of pencils on Monday and Tuesday. She still three more boxes on Monday then on
2 answers
492 views
Estimate the sum or diffrence. Use the bench marks 0, 1/2, 2 2/15 + 13/30 =
Answers 0 1/2 1
10 answers
2,712 views
You cut vegetables for a stew. You have 7/8 cup carrots, 1/3 cup onions, and 1/2 cup peppers. About how many cups of vegetable
20 answers
3,634 views
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