CHEMISTRY HIGH SCHOOL

D Serum Levels Of 4 Mcg/mL, Calculate The Dose, In Milligrams, For A 120-lb Patient That May Be Expected To Result In A Blood Serum Gentamicin Level Of 4.5 Mcg/mL. This problem has been solved! See the answer If the administration of gentamicin at a dose of 1.75 mg/kg is determined to result in peak blood serum levels of 4 mcg/mL, calculate the dose, in milligrams, for a 120-lb patient that may be expected to result in a blood serum gentamicin level of 4.5 mcg/mL.

Answers

Answer 1

Answer:

Answer:

The patient requires a dose of 107.2 mg of gentamicin

Explanation:

A dosage of 1.75 mg per Kilogram body weight results in blood serum levels of 4.5 mcg/mL

This means that; 1.75 mg/ kg = 4.0 mcg/mL

Therefore, dosage of gentamicin in mg/kg that will result in 4.5 mcg/mL blood serum level = (1.75 mg/Kg * 4.5 mcg/mL) / 4.0 mcg/mL

Dosageof gentamicin = 1.97 mg/Kg

1-lb = 0.453592 Kg

Weight of 120-lb patient in Kg = 120 * 0.453592 = 54.43 Kg

Dose in mg required by patient = 1.97 mg/Kg * 54.43 Kg = 107.2 mg

Therefore, the 120-lb patient requires a dose of 107.2 mg of gentamicin to result in a blood serum level of 4.5 mcg/mL

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What needs to happen for a solute to dissolve in a particular solvent?

Answers

Answer: In order to a solute to dissolve in a solvent, both the attraction forces that bind the units of solute together and the intermolecular forces that bind the molecules of solvent together must be weaker than the attraction forces between the particles of solute and the molecules of solvent.

Explanation:

The solute particles in are binded together in virtue of attractive forces (the nature and strength of these forces depends on the particular solute).

The same happens with the solvent molecules: they are binded by attractive forces (similarly, the nature and strength of these forces depend on the particular solvent).

To get dissolved (form solution) the particles of solute must be separated and mixed with the solvent particles in a process called solvatation.

The solute particles must surrounded by the solvent particles.

When the forces of attraction between the solute particles and the solvent are stronger than the forces of attraction that bind the solute particles, the solute particles move away from the solid solute and are integrated into the solution.

the attractions between the solute and solvent molecules must be greater than the attractions keeping the solute together and the attractions keeping the solvent together.

Which chemical equation best illustrates the Law of Conservation of Mass? (My answer: D)2H2O yields H2 + O2

CH4 + 3O2 yields CO2 + 2H2O

Al4C3 + 3H2O yields CH4 + 4Al(OH)3

Zn + 2HCl yields ZnCl2 + H2

Answers

It its definitely D.

A 0.8115 g sample of HCl was placed into a 50 mL volumetric flask and the sample was thoroughly dissolved in water to make 50 mL of solution. It required 22.07 mL of NaOH to reach the endpoint in the titration. What is the molarity of the NaOH solution?

Answers

Answer:

Molarity of NaOH solution is 1.009 M

Explanation:

Molar mass of HCl is 36.46 g/mol

Number moles = (mass)/(molar mass)

So, 0.8115 g of HCl = $(0.8115)/(36.46)moles$ HCl = 0.02226 moles HCl

1 mol of NaOH neutralizes 1 mol of HCl.

So, if molarity of NaOH solution is S(M) then moles of NaOH required to reach endpoint is $(S* 22.07)/(1000)moles$

So, $(S* 22.07)/(1000)=0.02226$

or, S = 1.009

So, molarity of NaOH solution is 1.009 M

What does the exosphere do??

Answers

In the case of bodies with substantial atmospheres, such as Earth's atmosphere, the exosphere is the uppermost layer, where the atmosphere thins out and merges with interplanetary space. It is located directly above the thermosphere.

The Exosphere is the outer layer of the earths atmosphere but the exosphere is pretty much outer space and it has satellites orbiting.

Which end of a water molecule is positive and which end is negative and why?

Answers

The region or the end of water molecule that is partially positive would be where the Hydrogens are. The end that is partially negative, is where the Oxygen is. These partial charges, are because of the large electronegativity differences present between the hydrogens and Oxygen in the molecule. Thus unequal electron distribution or sharing occurs between the atoms in the molecule causing it to be polar and possess the partial charges.

A sample of 76 g of NaCl is dissolved to make 1 L of solution. What is the molarity of the solution? Show your work.

Answers

The answer is 1.3 mol of NaCl.

We know that there is 76 g of NaCl in 1L of the solution.
But we need to calculate the molarity.
First, we will need the molar mass of NaCl, which is the sum of relative atomic masses of Na (22.99 g/mol) and Cl (35.45 g/mol):
Mr(NaCl) = A(Na) + A(Cl) = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol.

This says that there are 58.44 g of NaCl in 1 mole. So, in how many moles will be 76 g of NaCl)? Use the proportion:
58.44 g : 1 mol = 76 g : x

After crossing the products:
x * 58.44 g = 1 mol * 76 g
x = 76 / 58.44 mol = 1.3 mol

Answer:

1.3005 M

Explanation:

Given that:

Mass of NaCl = 76 g

Molar mass of NaCl = 58.44 g/mol

The formula for the calculation of moles is shown below:

$moles = (Mass\ taken)/(Molar\ mass)$