03/01/21

When preparing a buffer with a target pH from a selection of acids, how would you select the best Acid for the buffer?
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03/01/21

ΔG° = ΔH° - TΔS°
For the reactionC(s,graphite) + O2(g)  CO2(g)G° = -394.3 kJ and S° = 2.9 J/K at 259 K and 1 atm.This reaction is (reactant, product) ______favored under standard conditions at 259 K.The standard... more
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03/01/21

ΔG° = ΔH° - TΔS°
For the reaction2CO2(g) + 5H2(g)C2H2(g) + 4H2O(g)H° = 46.5 kJ and S° = -124.8 J/KThe standard free energy change for the reaction of 1.62 moles of CO2(g) at 279 K, 1 atm would be _____ kJ.This... more
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03/01/21

Predict the Sign of ΔS
Which of the following transformations represent an increase in the entropy of the system.Choose all that apply 46 g Hg (liquid, 615K)46 g Hg (liquid, 249K) 2 mol He (1.32 atm, 205K)2 mol He... more
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03/01/21

What is the enthalpy of vaporization?
A mixture has a boiling pt of 371.7K with a vapor pressure of 184.52mmhg at 249.55K. what is the enthalpy of vap in kJmol-1? What is the vap pressure going to be at 295k? Do I use... more
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03/01/21

Did I correctly find the temperature of the vapor pressure using Clausius-Clapeyron equation?

It has an enthalpy of vap of 41.098 kJ mol-1. If the vapor pressure is 78.90 mmHg at 43.21 celsius, at what temp is vapor pressure equal to 666.6mmhg?I used Clausius-Clapeyron formula:... more
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03/01/21

Chemistry Question
The balanced combustion reaction for  isIf  is burned and the heat produced from the burning is added to  of water at C, what is the final temperature of the water?
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02/28/21

POCl3. Draw with octet rule, and 2 with expanded octet
Can you please also explain the difference between octet and expanded octet.
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02/28/21

Show how bonding occurs between magnesium and fluorine?
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02/28/21

In which of the following does the central atom OBEY the octet rule.

-BF3 -PF3 -SF4 -SiF6-2 -XeF4
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02/28/21

How many electrons are exchanged when calcium bonds with nitrogen?
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02/28/21

In a collision of sufficient force, automobile air bags respond by electrically triggering the explosive decomposition of sodium azide (NaN3) to its elements. A 29.4−g sample of sodium azide was...
decomposed, and the nitrogen gas generated was collected over water at 26°C. The total pressure was 733.8 mmHg. How many liters of dry N2 were generated?I got 1158.62 L but it is wrong.
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02/28/21

Will the volume of a gas increase, decrease, or remain unchanged for the following set of changes? The pressure is decreased from 6.33 atm to 1.05 atm, while the temperature...
is increased from 123 degrees C to 234 degrees C a) The volume increasedb) The volume will decreasec) The volume will not change
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02/28/21

Fraction pressure

liquid A has a vapor pressure of 350 mmHg and liquid B has a vapor pressure of 100 mmHg.The molar fraction of A in steam is twice that of the molar fraction in solutionwhat is the molar fraction of... more
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02/27/21

i dont know what to do
a 1.35 L solution of Sulfuric Acid is 18.15 M. It has a density of 1.84g/mL. Calculate the % by mass of this solution
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02/27/21

Complete the reaction equation & explain: Co + F2
Complete the reaction equation & explain: Co + F2
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02/27/21

How much heat will be given off?
2C3H6O (I) + 8O2 (g) = 6CO2 (g) + 6H2O( g) + 853.6 KCALWrite the amount of heat that will be given off, if 0.350 mol of acetone is burned completely?Heat = ........kcalplease write down the... more
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02/27/21

Consider an aqueous reaction and determine the salt that forms

Consider this Aquarius reaction.HMnO4(aq) +Mg(OH)2what is the formula for the salt that forms?
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02/27/21

Hemoglobin is the protein that transports O2 through the blood from the lungs to the rest of the body. In doing so, each molecule of hemoglobin combines with four molecules of O2. If 1.37 g of...
hemoglobin combines with 2.13 mL of O2 at 37°C and 724 torr, what is the molar mass of hemoglobin?Answer in scientific notation
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02/27/21

A certain photon of light has a wavelength of 4.10 x 10-7 m. Calculate the frequency of a photon of this light.

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02/26/21

College chemistry 1
Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Rb2S and Ni(NO3)3 are mixed.
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02/26/21

What is the theoretical yield of MgCl2in moles? In grams?
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02/26/21

Chemistry, grade 11
What is the number of valence electrons of gallium Ga (Z = 31)? Write its electron configuration and give the four quantum numbers of these electrons of valence
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02/26/21

Chemistry, grade 12 - Quantum numbers
Among the combinations of quantum numbers, which do not work?A) n = 2; l = 1; ml = 1, s = = + 1/2B) n = 3; l = 2; ml = - 2, s = = - 1/2C) n = 1; l = 0; ml = 1, s = = + ½D) n = 3; l = 2; ml = 0, s... more
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02/26/21

2KI + Pb(N03)2 → 2KN03 + Pbl2
Bobby and Jane dissolve 26.8 g of solid potassium iodide in water, then pour the solution into an excess of concentrated lead (ll) nitrate. Jane carefully filters the resulting yellow precipitate... more
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