A certain drug has a half-Iife in the body of 2.5 h. What should the interval between doses be, if the concentration of drug in the body should not fall belc 40.% of its initial concentration? Round your answer to 2 significant digits.

Q: Atmosphene scientists ofien use mixing ratios to express the concentrations of trace compounds in…

A: The given data contains, Total pressure=635 torr.Temperature=0°C.Concentration of CO=2.5×102ppmv.

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A: A multiple choice question based on physical chemistry, which is to be accomplished.

Q: plasma drug concentrations following an intravenous bolus administration of a 250mg dose of a drug…

A: Given: C1=70mg/ml t1=0.5 hrs C2=10mg/ml t2=6 hrs

Q: Question 18

A: Given,Moles of Mg(C2H3O2)2 = 0.600mol.Volume = 135mL = 0.135L.Concentration of Mg(C2H3O2)2:

Q: A chemist dissolved 0.08346g of SrCl2 (FW 158.53) and treated it with excess AgNO3 (FW 169.87) to…

A: A question based on mole concept that is to be accomplished.

Q: What is the concentration of the solution prepared by diluting 200 µl of kanamycin (25 mg/ml) to a…

A: (1 )Kanamycin have 25mg/ml That is 1 ml have 25 mg 200 u ml= 10-9x 200 ml = 2 x 10-7 ml have = 2 x…

Q: Iron(III) hydroxide (MM = 106.87 g/mol) has a Ksp of 6.3 x10-38.  If 35.9 g Fe(OH)3 is stirred into…

A: The solubility reaction of Fe(OH)3 is  Fe(OH)3 (s) ----> Fe3+ (aq) + 3 OH- (aq)  Assuming that…

Q: 14. Epinephrine is available as a 1:1000 w/v solution. If a patient dose is 0.2 mg IM, how many mL…

A: Given : Ratio of w/v= 1:1000 Pateint dose = 0.2 mg To find : Volume in ml Solution : If weight by…

Q: A student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M…

A: (a) y = 0.345x -0.11 Absorbance = y = 0.655 0.655 = 0.345x -0.11 x = 2.22 M   (b) Molarity = Mass %…

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A:

Q: You want to prepare 500.0 mL of 1.000 M KNO, at 20 C, but the lab (and water) temperature is 28 "C…

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Q: C. A student preparing this solution weighs 1.4802 g M9SO4•7H2O directly into the 50.00 mL…

A:

Q: A chemical factory has been illegally disposing their chemical wastes without necessary…

A: Given, Site                                   A                          B…

Q: Questions are attached

A: The molarity, molality, formality and normality are expressions for concentrations of solutions. The…

Q: If the concentration of Sn2+ ions in a solution of Sn(OH)2 was measured to be (1.41x10^-3), what is…

A:

Q: In the acetic ačid determination in vinegar experiment; NaOH was standardized with 0.35 g KHP (molar…

A: In this question, we want to determine the Molarity of NaOH  You can see details Solution below step…

Q: uppose 92.5 mL92.5 mL of a 0.159 M0.159 M solution of Na2SO4Na2⁢SO4 reacts with 143 mL143 mL of a…

A: The balanced reaction taking place is given as, => Na2SO4 (aq) + MgCl2 (aq) ----> MgSO4 (s) +…

Q: A 1.407 g sample of canned tuna was analyzed by the Kjeldahl method. The liberated NH3 required…

A:

Q: A patient weighing 119lb is to receive 300 mg of medication in 750 mL solution is to be titrated at…

A: Patients weight = 119 lb 300 mg of medication is present in 750 mL solution

Q: The LD50 of KCN for a 75kg person is 375mg. If this amount of KCN was put into a single cup (275mL)…

A: Given:The median lethal dose of the of potassium cyanide is 375mg for 75kg person.Volume of a single…

Q: What is the density of 47.0 wt% aqueous NaOH (FM 40.00) if 17.6 mL of the solution diluted to 1.80 L…

A: Here we have,47.0 wt% (0.47%) aqueous NaOH (FM 40.00) [47 g NaOH in 100 ml water]Volume of NaOH…

Q: 7. Why is the percent recovery of the essential oil less than 100%? State at least two reasons that…

A: To give reasons why percent recovery is less than 100%

Q: Q: The Soluibility of GaC13 is 0.004M. What is the Ksp? * O 7E-9 O 9 E-9 O 4.7 E-10 O 2.8 E-9 O Does…

A: The solubility product is simply defined as the product of the concentration of ions in a saturated…

Q: A 2.6 g sample of plant tissue was analyzed and found to contain 3.6 mg zinc, what is the…

A: Ppm is one of the ways to represent the concentration of solution  Here we are required to express…

Q: A chemist dissolved 0.08346g of SrCl2 (FW 158.53) and treated it with excess AgNO3 (FW 169.87) to…

A: Given that, Molar mass of SrCl2 = 158.53g/mol Molar mass of AgNO3 = 169.87g/mol Molar mass of AgCl =…

Q: A solution was prepared by dissolving 514 mg of K3Fe(CN)6 in sufficient water to give 758 ml of…

A: Mass = 514 mg = 0.514 g V = 758 mL = 0.758 L

Q: A patient weighing 119 lb is to receive 300 mg of medication in 750 mL solution is to be titrated at…

A:

Q: A lump of sucrose of mass 10.0 g is suspended in the middle of a spherical flask of water of radius…

A: Given: Mass of sucrose (m) = 10.0 g                             Radius (r) = 10 cm…

Q: Considering that the Redfield ratio for algae is C:N:P = 106:16:1, what would be the limiting…

A: Given  ( Red field ratio for algae is C:N:P = 106:16:1 ) Mass concentrations of C= 20 mg/L =…

Q: Yttrium (III) carbonate (MM = 357.84 g/mol) has a Ksp of 1.0 x10-31.  If 15.5 g Y2(CO3)3 is stirred…

A: The solubility reaction of Yttrium (III) carbonate is given by  Y2(CO3)3 (s) -----> 2 Y3+ (aq) +…

Q: A Hospital pharmacist wants to use three lots ZnO ointment containing repectively 50%, 20% and 5%…

A:

Q: In a Spec-20 experiment a student took 4.3178g of an unknown material containing cobalt and…

A: Given data,Mass of sample=4.3178gMolarity of Co solution=0.075MVolume of solution=250mL=0.250L

Q: Your body deals with excess nitrogen by excreting it in the form of urea, NH2CONH2. The reaction…

A: The number of moles of urea that equivalent to 95 mg of urea is; 1000 mg=1 gnurea=mureaMMurea=95…

Q: 4 . What mass in mg of Fe2+ would be in 686g of drinking water if it was at the safe limit of…

A: In this question, we want to determine the mass of Fe2+ in mg unit.  You can see details Solution…

Q: A water quality monitoring found that local bayou contains 8.72x10-4 % (wt/wt) nitrate ion ( MW =…

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Q: 6. A stock solution of iron was prepared by dissolving 1.452g FeCl3 in water, reacting with…

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Q: prod o deixar el riquor igW vinuminos on home de The concentration of Salt is 252 g1-1. There is a…

A:

Q: student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M…

A: Introduction :  Percent error is an expression to let know the difference between calculated value…

Q: Assume that a solute has a D* of 2.03 x 10-9 m2 / Sec and that w is equal to 0.5. If landfill…

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Q: The Ksp for Al(OH)3= 2.0x10-32at 25.0 °C. How many grams of aluminum hydroxide will dissolve in 1.00…

A: Given: Ksp for Al(OH)3 = 2.0 x 10-32 Temperature = 25°C Volume = 1.00 L

Q: 17. The mathematical expression for a particular isotherm is: Cs = Kf × Cn aq Where Kf = 5.012 and n…

A: Solution -

Q: 2. A plant discharges 4000 gal/min of treated wastewater that contains 0.25 mg/L of PCBS…

A: Waste water flow rate = 4000gal/min 1 galoon = 3.785L

Q: Write the dissociation equation and the Ksp expression for Ca3(PO42(s).

A: The Ksp expression is written from the dissociation reaction of any compound.

Q: A particle diagram is a symbolic representation of atoms and molecules at the microscopic level. Whi…

A: The combination of ions in an appropriate molar ratio produces an ionic compound. Example: potassium…

Q: P16C.4 A lump of sucrose of mass 10.0 g is suspended in the middle of a spherical flask of water of…

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Q: If the initial concentration of SO2 Cl2 is 0.175 M, what is the concentration of SO2C12 after 510 s…

A:

Q: If the concentration of Sn2+ ions in a solution of Sn(OH)2 was measured to be (1.24x10^-3), what is…

A: Given, concentration of Sn2+  = 1.24 × 10^(-3)...

Environmental Pollution

Environmental pollution occurs due to some unwanted alteration in the surroundings which results in unfavorable effects on all organisms of that surrounding.