J.R. S.

A certain liquid X has a normal boiling point of 124.60°C and a boiling point elevation constant = Kb0.73·°C·kgmol−1. Calculate the boiling point of a solution made of 24g of alanine (C3H7NO2)... more

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Chemistry

04/26/20

Which of the following reactions will have a negative value of ∆S?

(i) Ba2+(aq) + SO42-(aq) → BaSO4(s)(ii) 2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g)(iii) 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(l)answer is i and iiiWhy is (iii) negative

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Science Chemistry

04/26/20

Calculate E°(cell) for the reaction

Calculate E°(cell) for the reaction, 2 IO3-(aq) + 10 Fe2+(aq) <=> 10 Fe3+(aq) + I2(aq) given the reduction potentials:Fe3+(aq) + e- <=> Fe2+(aq) , E° = 0.87 V2 IO3-(aq) + 10 e-... more

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Chemistry

04/26/20

How many 𝜎 and 𝜋 bonds are in this molecule?

A 6 membered carbon ring with a hydroxy substituent. Note that there are three double bonds in the ring.

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Chemistry Biochemistry Organic Chemistry

04/26/20

Gases Liquids and Solids

A certain liquid X has a normal freezing point of 5.50°C and a freezing point depression constant = Kf 1.83·°C·kgmol−1. A solution is prepared by dissolving some iron(III) chloride (FeCl3)... more

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Chemistry

04/26/20

Gas Law Chemistry

At STP, 7.0 grams of CO gas will occupy a volume of 4.07 L at 718 mm Hg, what is the temperature?

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Pharmacology

04/26/20

What are the drugs that comprise Truvada?

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Chemistry

04/26/20

how to get the stoichiometric calculation of NaOCl(aq) + CH3COOH(aq) ==> CH3COONa(aq) + HOCl(aq)

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Chemistry

04/26/20

How many grams of lead may be formed by the passage of 7,962 C through an electrolytic cell that contains an aqueous Pb(IV) salt.

answer is 4.27. Can you explain

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Biochemistry

04/26/20

i need help with this problem

Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water and carbon dioxide chemically react to form the simple sugar glucose and oxygen... more

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Chemistry

04/25/20

hey can you answer this 3 please and thank you!!!!

17).Calculate the pH of a 0.250 M Ba(OH)2 solution at 25oC?19.) Calculate the pH of a 0.250 M solution of benzoic acid (C6H5CO2H) if Ka = 6.3 x 10-5 for the acid. C6H5CO2H(aq) ⇌ H+(aq) +... more

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Chemistry

04/25/20

The triple point for carbon dioxide is 5 atm and -57 degrees C.

List the phase changes a sample of dry ice would go through if heated from -100 degrees C to 10 degrees C at 6 atm pressure.

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Chemistry

04/25/20

What mass of hydrogen gas is produced when 10.0 g aluminum react? Report your answer in grams.

What mass of hydrogen gas is produced when 10.0 g aluminum react? Report your answer in grams.6 HCl + 2 Al → 2 AlCl3 + 3 H2

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Chemistry

04/25/20

What mass of oxygen (in grams) is needed to burn 3.5g of propane (C3H8) according to the following equation

What mass of oxygen (in grams) is needed to burn 3.5 g of propane (C3H8) according to the following equations: C3H8 + 5 O2 → 4 H2O + 3 CO2

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Chemistry

04/25/20

Which of the following factors does NOT increase the rate of a reaction?

Decreasing the concentration of the reactants Increasing the surface area of the reactants Adding an effective catalyst to the systemincreasing the temperature of the system

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Chemistry Biochemistry Organic Chemistry

04/25/20