FINAL 05 - Computations Flashcards
If Co=500 mg/L and k=0.05 mg/L/hour, calculate t1/2. (Zero order reaction)
500 hours
A drug degrades at a rate constant k=0.02 mg/L/hour, and its initial concentration is 10 mg/L. Find the half-life (Zero order reaction)
250 hours
The initial drug concentration is Co=25 mg/L and the rate constant is 0.02 mg/L/hour. Determine how long it takes for the drug to degrade to 6.25 mg/L. (Zero order reaction)
937.5 hours
For a drug with Co=100 mg/L and t1/2=200 hours, calculate k. (Zero order reaction)
0.25 mg/L/hour
A drug with k=0.01 mg/L/hour degrades to 50 mg/L in 1,000 hours, find the initial concentration (Co) (Zero order reaction)
60 mg/L
A drug has a rate constant of k=0.01 hour^-1. Find its half-life. (First order reaction)
69.3 hours
For k=0.05 hour^-1, calculate the half-life. (First order reaction)
13.86 hours
A drug degrades from Co=100 mg/L to C=50 mg/L in 20 hours. Find k. (First order reaction)
0.03477 hour^-1
Determine the time required for a drug with Co=120 mg/L and k=0.02 hour^-1 to degrade to 30 mg/L. (First order reaction)
69.3 hours
A drug has a half-life of 30 hours. Calculate k. (First order reaction)
0.0231 hour^-1
For k=0.02 L/mol/hour and Co=1.0 mol/L, calculate the half-life. (Second order reaction)
50 hours
If Co= 2.0 mol/L and k=0.04 L/mol/hour, find the half-life. (Second order reaction)
12.5 hours
For t1/2=10 hours and Co=0.5 mol/L, find k. (Second order reaction)
0.2 L/mol/hour
A liquid has a refractive index n=1.50, density d=0.8 g/mL, and molecular weight MW=120 g/mol. Find the molar refraction.
44.12 cm^3/mol
Given n=1.40, d=1.2 g/mL, and MW = 180 g/mol, find the molar refraction
36.36 cm^3/mol
A compound with MW=100 g/mol has a refractive index n=1.55 and density d=0.85 g/mL. Calculate the molar refraction.
37.46 cm^3/mol
Determine the molar refraction of ethanol (CH3CH2OH)
12.96 cm^3/mol
Calculate the molar refraction of acetic acid (CH3COOH)
12.86 cm^3/mol
Find the molar refraction of benzene (C6H6)
21.12 cm^3/mol
Determine the molar refraction of glucose (C6H12O6)
40.32 cm^3/mol
Determine the specific rotation of a compound if the optical rotation of a 1% w/v solution in a 1 dm tube is +52.31°
+5231°
Calculate the molar rotation of a compound with molecular weight MW=180 g/mol and a specific rotation of +5231°
+9415.8
You need to prepare 1 L of a 0.9% NaCl isotonic solution. NaCl has a freezing point depression constant of 1.86°C and dissociated completely (i=1.8). What is the freezing point depression of the solution?
0.516°C
Determine the isotonic concentration of KCl required to achieve ΔTf=0.52°C (Kf=1.86, i=1.85).
0.15 mol/kg
You have a solution with a freezing point depression of 0.48°C. Is it isotonic if NaCl dissociated completely with Kf=1.86 and i=1.8?
No, the solution is not isotonic. (0.144 mol/kg x 58.44 = 8.41 g/L; which is slightly less than 0.9%)
