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Chemistry

04/04/24

How many grams of potassium chloride (MW K = 39, MW Cl = 35.5) are needed to make 125 mL of a solution containing 200 mOsmol/L? Do not include units. Round to the nearest hundredth.

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Chemistry

04/04/24

Drawing a box diagram of the electron configuration of an atom

Drawing a box diagram of the electron configuration of an atom: Draw the electron configuration for a neutral atom of cobalt.

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Chemistry Math Pharmacology

04/04/24

A liter of an electrolyte solution contains the following: 131 mEq Na+, 111 mEq Cl-, 5 mEq K+, 29 mEq C3H5O3- (lactate), and 4 mEq Ca2+. How do you convert each of these values to mmol/L?

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Chemistry Math Pharmacology

04/04/24

Sterile solutions of potassium chloride containing 5 mEq/mL are available in 20 mL containers. How do you calculate the amount, in grams, of potassium chloride in the container.

Rationale, and what is being asked.

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Chemistry Math Pharmacology

04/04/24

A sterile solution of potassium chloride contains 2 mEq/mL. If a 20-mL vial of the solution is diluted to 1 liter, what is the percentage strength of the resulting solution?

Rationale, and tips for what to look for in a problem like this.

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Chemistry Math Pharmacology

04/04/24

How do you convert blood plasma range of 11 to 25 mcmol/L of copper (MW=63.55) to mcg/mL?

Tips for knowing what a question like this is asking for.

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Chemistry Math Pharmacology

04/04/24

How many milliliters each of purified water and an isotonic sodium chloride solution should be used to prepare 30 mL of a 1% w/v isotonic solution of fentanyl citrate (E=0.11)?

How to know what the question is looking for.

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Chemistry Math Pharmacology

04/04/24

How do you calculate the following to determine if they are hypotonic, isotonic, or hypertonic?

a. An ophthalmic solution containing 40 mg/mL of cromolyn sodium and 0.01% of benzalkonium chloride in purified waterb. A parenteral infusion containing 20 % (w/v) of mannitolc. A 500-mL... more

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Chemistry Math Pharmacology

04/04/24

How many grams of anhydrous dextrose should be used in preparing 1 liter of a 1/2% isotonic ephedrine sulfate nasal spray?

Provide step-by-step rationale and context/indications about why a certain approach to this problem is the correct one.

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Chemistry Math Pharmacology

04/04/24

How many milliliters of a 5% solution of boric acid should be used in compounding a given prescription? (Details below)

Oxymetazoline hydrochloride 1/2%Boric acid solution qsPurified water ad ... more

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Chemistry Math Pharmacology

04/04/24

How do you calculate the effective quantity (g) of sodium chloride related to tonicity in 100 mL of an intravenous fluid labeled "5% dextrose in 0.45% sodium chloride"?

What steps and formula should be used for a problem like this, and what is the overall rationale?

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Chemistry

04/04/24

need help with a pH question

In a beaker, there is 40 mL of 0.1 M weak acid, HA (Ka=2.5 x 10-8). Calculate the pH of this acid then calculate the pH after 25 mL of 0.1 M NaOH has been added.

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Chemistry

04/04/24

Which salts will be more soluble in an acidic solution than in pure water? (in description)

1.) BaSO4 2.) CsClO4 3.) AgI 4.) Zn(OH)2 5.) CaCO3

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Chemistry

04/04/24

Calculate the pH of the titration mixture after 20.0 mL of base have been added.

A 25.0 mL sample of a 0.100 M solution of acetic acid is titrated with a 0.125 M solution of NaOH. Calculate the pH of the titration mixture after 20.0 mL of base have been added. The Ka for... more

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Chemistry

04/04/24

Calculate the pH of the titration mixture after 20.0 mL of base have been added.

A 25.0 mL sample of a 0.100 M solution of acetic acid is titrated with a 0.125 M solution of NaOH. Calculate the pH of the titration mixture after 20.0 mL of base have been added. The Ka for... more

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Chemistry

04/03/24

I calculated the theoretical yield for my chemistry assignment, I am just unsure how many sig figs I need. My answer is The theoretical yield in g of this experiment based on the mass of aluminum... more

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Chemistry

04/03/24

What quantity of heat (in kJ) is absorbed in the process of making 0.771 mol of CF₄ from the following reaction? C (s) + 2 F₂ (g) → CF₄ (g) ∆H° = 141.3 kJ/mol

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Chemistry

04/03/24

need help with a pH question

There are several parts to this question but I just need help with two portions. A buffer is made from 3.5 grams of sodium acetate, 8.8 mL of 3.0 M acetic acid, and 55.6 mL of water. Calculate the... more

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Chemistry

04/03/24

Find the theoretical and per cent yeilds

Magnesium is the limiting reactant in this experiment. Calculate the theoretical yield of MgO for each trial. Trial 1: Trial 2: Determine the per cent yield of MgO for your experiment for each... more

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Chemistry

04/03/24

If 3.4 mol C2H4O are used, determine the number of moles of O2 that would be used

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Chemistry

04/03/24

Gen Chem 2: coulombs

8. How many Coulombs of charge are needed to reduce FeSO4 to yield 28.5g of Fe metal?A) 157 CB) 2.91 x 105 CC) 2.46 x 104 CD) 2.75 x 103 CE) 3.62 x 104 CF) 72.7 CG) 5.01 x 104 CH) 9.85 x 104 C

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Chemistry

04/02/24

How to solve this delta G problem (gen chem 2)

2. Consider the following reaction, for which data at 25oC are given: 2Na+(aq) + CO32-(aq) → Na2CO3(s)∆Hof (kJ/mol) -240.1 -677.1 -1130.8So (J/K mol)... more

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Chemistry

04/01/24

Homework. Need help fast. Please and thank you

At a certain temperature, the equilibrium constant for the following chemical reaction is 4.57*10^-3. At equilibrium, the concentration of AB is 1.225 M, the concentration of BC is 2.925 M, and the... more

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Chemistry

03/31/24

Consider the titration of 50.0 mL of 0.310 M weak base B (Kb = 7.5 x 10⁻⁶) with 0.340 M HNO₃. What is the pH of the solution after the addition of 90.0 mL of HNO₃?

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Chemistry

03/31/24

Balance the chemical reaction in basic conditions with lowest whole number cofficients.

Unbalanced Equation:As(s) + H2BO3−(aq) → AsO2−(aq) + B(s)

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Answers •1

How many grams of potassium chloride (MW K = 39, MW Cl = 35.5) are needed to make 125 mL of a solution containing 200 mOsmol/L? Do not include units. Round to the nearest hundredth.

Drawing a box diagram of the electron configuration of an atom

A liter of an electrolyte solution contains the following: 131 mEq Na+, 111 mEq Cl-, 5 mEq K+, 29 mEq C3H5O3- (lactate), and 4 mEq Ca2+. How do you convert each of these values to mmol/L?

Sterile solutions of potassium chloride containing 5 mEq/mL are available in 20 mL containers. How do you calculate the amount, in grams, of potassium chloride in the container.

A sterile solution of potassium chloride contains 2 mEq/mL. If a 20-mL vial of the solution is diluted to 1 liter, what is the percentage strength of the resulting solution?

How do you convert blood plasma range of 11 to 25 mcmol/L of copper (MW=63.55) to mcg/mL?

How many milliliters each of purified water and an isotonic sodium chloride solution should be used to prepare 30 mL of a 1% w/v isotonic solution of fentanyl citrate (E=0.11)?

How do you calculate the following to determine if they are hypotonic, isotonic, or hypertonic?

How many grams of anhydrous dextrose should be used in preparing 1 liter of a 1/2% isotonic ephedrine sulfate nasal spray?

How many milliliters of a 5% solution of boric acid should be used in compounding a given prescription? (Details below)

How do you calculate the effective quantity (g) of sodium chloride related to tonicity in 100 mL of an intravenous fluid labeled "5% dextrose in 0.45% sodium chloride"?

need help with a pH question

Which salts will be more soluble in an acidic solution than in pure water? (in description)

Calculate the pH of the titration mixture after 20.0 mL of base have been added.

Calculate the pH of the titration mixture after 20.0 mL of base have been added.

Sig Figs in Theoretical Yield

What quantity of heat (in kJ) is absorbed in the process of making 0.771 mol of CF₄ from the following reaction? C (s) + 2 F₂ (g) → CF₄ (g) ∆H° = 141.3 kJ/mol

need help with a pH question

Find the theoretical and per cent yeilds

If 3.4 mol C2H4O are used, determine the number of moles of O2 that would be used

Gen Chem 2: coulombs

How to solve this delta G problem (gen chem 2)

Homework. Need help fast. Please and thank you

Consider the titration of 50.0 mL of 0.310 M weak base B (Kb = 7.5 x 10⁻⁶) with 0.340 M HNO₃. What is the pH of the solution after the addition of 90.0 mL of HNO₃?

Balance the chemical reaction in basic conditions with lowest whole number cofficients.

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