09/28/23

complete the table below, Round each of your entries to 2 significant digits. You may assume the temperature is 25 C
Conjugate acid Conjugate Base formula Ka formula Kb H3BO3 5.8 x 10-10 ______ _____ H BrO 2.3 x 10-9 ______ _____ _____ _____ HCO3- 2.2 x 10-8
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09/28/23

Calculate the pH at 25 °C
Calculate the pH at 25 °C of a 0.99 M solution of trimethylammonium chloride ((CH3)3 NHCI): Note that trimethylamine ((CH3)4N) is a weak base with apKb of 4.19.Round your answer to 1 decimal... more
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09/28/23

what mass of (CH3)2 NH2 CI should the student dissolve in the (CH3)2NH solution

A chemistry graduate student is given 500. mL of a 0.90M dimethylamine ((CH3)2 NH) solution. Dimethylamine is a weak base with Kb = - 5.4 × 10-4 what mass of (CH3)2 NH2 CI should the student... more
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09/28/23

What mass of KCN should the student dissolve in the HCN solution
A chemistry graduate student is given 125. mL of a 0.90M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with K, = 4.9 x 10-10. What mass of KCN should the student dissolve in the... more
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09/28/23

Calculate the pH of the solution.
A solution is prepared at 25 °C that is initially 0.33 M in methylamine (CH3, NH2), a weak base with Kb = 4,4 x 10-4,, and 0.074 M in methylammonium bromide (CH3NH3Br). Calculate the pH of the... more
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09/28/23

Calculate the pH of the solution
A solution is prepared at 25 °C that is initially 0.42M in chlorous acid (HCIO2), a weak acid with Ka = 1.1 × 10-2, and 0.26M in potassium chlorite (KCI02)Calculate the pH of the solutionRound your... more
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09/27/23

Investigating Solution Concentration Using an Oscillating Reaction

You will prepare 100.00 mL of a solution with final concentration of 0.150 moles/L malonic acid solution CH2(COOH)2 and 0.0200 moles/L MnSO4You are provided: Solid malonic acid, CH2(COOH)2 0.145... more
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09/27/23

Investigating Solution Concentration Using an Oscillating Reaction
You will prepare 50.00 mL of a solution with final concentrations of 0.200 mole/L KIO3 and 0.0800 mol/L H2SO4 You are provided: • Solid potassium iodate, KIO3 • 0.625 moles/L H2SO4 stock solution.... more
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09/26/23

A solution is made of 2.05g of sucrose [C12H22O11] dissolved in 9.87g of water . Calculate freezing and boiling points of sucrose solution
Show work step by step for easy understanding
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09/26/23

40.0 L at a pressure of 352 torr . If the pressure changes to 1760 torr , with no change in the temperature or moles of gas, what is the new volume, V2 ?
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09/26/23

At 25 degrees Celsius, NO2 and N2O4 exist in the following equilibrium. Find the equilibrium pressure of N2O4 if Pno2=1.9 atm
2NO2(g)=N2O4
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09/26/23

Calculate the value of Kp for the equation: C(s)+CO2(g)=2CO(g)
Given that at a certain temperature C(s)+2H2O(l)=CO2(g)+2H2(g) Kp1=3.05H2(g)+CO2=H2O(l)+CO(g) Kp2=0.621
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09/25/23

Biochemistry HW QUESTION-I am stuck! Please help!
Indicate which of the amino acid residues in the following peptide sequence contains a group that has a negative charge for its most likely charge state at pH 10.Thr-Glu-Trp-Lys-Ser-Asn-Ile-Gly-Gln
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09/25/23

What is the maximum number of electrons that can be identified with the following set of quantum numbers? n=4, l=0, ml=0, ms=+1/2
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09/24/23

Identify which sets are valid and classify the others, by the rule or principle that is violated.
The following sets of quantum numbers listed in the order in, lb, ML, and Ms were written, for the last electrons added to an atom. Identify which sets are valid and classify the others, by the... more
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09/24/23

A mixture of 0.5540 M CO and 0.3810 M Cl, is enclosed in a vessel and heated to 1000 K.
A mixture of 0.5540 M CO and 0.3810 M Cl, is enclosed in a vessel and heated to 1000 K.CO(g) + Cl2 (g) - COCI2 (g)K. = 255.0 at 1000 KCalculate the equilibrium concentration of each gas at 1000... more
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09/22/23

If a balloon filled with air has a volume of 15.0 L at 25.0°C, what is its volume (in L) at -100.0°C?

 If a balloon filled with air has a volume of 15.0 L at 25.0°C, what is its volume (in L) at -100.0°C? 
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09/22/23

Chemistry second order kinetics

Consider the equation; NO2< O2 + NOif the reaction proceeds at second order kinetics and has half-life of 100.0 seconds. If the reaction is carried out at some temperature and the initial... more
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09/21/23

Calculate the pH of a 2.6M solution of hydrocyanic acid.

The acid dissociation constant Ka of hydrocyanic acid (HCN) is 6.2 x 10-10. Calculate the pH of a 2.6M solution of hydrocyanic acid. Round your answer to 1 decimal place. pH =
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09/21/23

Calculate the volume of concentrated hydrobromic acid

A chemist must prepare 750.0 mL  of hydrobromic acid solution with a pH of 1.50 at 25 C.He will do this in three steps: Fill a 750.0 mL volumetric flask about halfway with distilled water. Measure... more
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09/21/23

Calculate the pH of the solution.
A chemist dissolves 159. mg of pure barium hydroxide in enough water to make up 80. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 C.)Round your answer... more
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09/21/23

Calculate the pH of the solution. (The temperature of the solution is  25 C.)
A chemist dissolves 752. mg of pure sodium hydroxide in enough water to make up 180. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 C.)Round your answer... more
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09/21/23

Calculate the pH of the solution
A chemist dissolves 836. of pure nitric acid in enough water to make up 350. mL of solution. Calculate the pH of the solution. Round your answer to 3 significant decimal places. 
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09/21/23

The following is a thermochemical question for the combustion of 1-pentene where environment conditions are at 15.4°C.
2C5H10(l) + 15O2(g) → 10H2O(g) + 10CO2(g) + 6318kJIf 15MJ of energy were to be released in the process of burning 1-pentene, what mass ofthe fuel was used?
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09/20/23

At neutral pH, what is the net charge on a “basic” amino acid? What is the net charge on an “acidic” amino acid?

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