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Explain what mass of platinum is contained in this sample? The platinum-containing cancer drug contains 65.0 mass-percent of the metal, if you have 1.53g of the compounds.
What fraction of a sample of cyclobutane remains after 612 seconds under the specified conditions when the first order rate constant is k=3.4 x 10^-3 s^-1 for the decomposition of cyclobutane >
Draw a diagram of how you plan to make your serial dilutions. Suppose you need to prepare five 2X serial dilutions in water of a 2.5mg/ml protein stock solution.
A 10.0 mL sample of gastric juice obtained several hours after a meal in a hospital laboratory was titrated with 0.1 M NaOH to neutrality; 7.2 mL of NaOH was needed.
Determine the mean volume and the average deviation from the mean if a pipet delivers 10.04, 10.02, 10.08, and 10.06 ml inconsecutive trials.
Calculate the weight of the watch glass and sample in grams if a 141-mg sample was placed on a watch glass that weighed 9,203g.
Explain why does never weigh a hot object? Illustrate the principle of conservation of matter? How could you separate a mixture of cyclohexane and zinc chloride?
Explain how could you separate zinc chloride from SIO2? Explain why is the NACL extracted with water three times as opposed to only once?
A student found that her mixture was 20%NACL, 15% NH4CL and 75% SIO2. Explain what did she most likely do incorrectly in her experiment?
At an initial pressure of 6.00atm a gas, expands from 10.0 liters to 12.00 liters against a constant external pressure of 3.00atm and in calories: (11-atm=24.217cal)
Determine the molality of commercial HCL solution which is12.1M, has a density of 1.19 g/mL and is 37.2 wt% HCl.
Determine the number of atoms would you require to have a necklace 36 cm long if a gold atom has a radius of 145 pm and you could string gold atoms like beads on a thread.
At 1200 degrees C a 1-mm sheet of FCC iron is used to contain the nitrogen in a heat exchanger. The concentration of N at one surfaces 0.04 atomic percent and the concentration at the second surface
Suppose the ideal gas behavior, determine the partial pressures and mole fractions of the gases (i) after the two gases react to form the maximum quantity of ammonia and (ii) initially.
Under which circumstances is it wise to use a mixture of solvents to carry out a re-crystallization? If a little activated charcoal does a good job removing impurities in a re-crystallization, why not
Assume a compound is involved in three different reactions which is denoted as R1, R2, and R3. Tripling the concentration of this reactant in all three reactions causes the rates of reaction to incr
Suppose if your doctor has diagnosed you as being anemic, that is, as containing too little iron in your blood. At the drugstore, you get a two iron-containing dietary supplements, one with iron (II
At 800 K 100.0 m moles of HI are initially in a 1.00 L container. After 10.0 minutes the concentration reduces to 15.0000mmole/L. Calculate the average rate of production of H2 in m mole/L min
Estimate the temperature of the discharge gas if the ratio of the intensities of the lines originating from levels n = 3 and n = 4 is150/1 in the Balmer spectrum of a hydrogen discharge.
A cannon ball made of iron which is having the volume of 115 cm3. What is the mass of the cannon ball in kilograms if iron has a density of 7.86 g/cm3.
A physician has ordered 325 mg of atropine, intra muscularly, determine the number of milliliters would you require to give if the atropine were available as 0.50 g/mL of solution.
Determine the mass of NaCl which is necessary to add to 200ml of water (which is having the density of =1.0 g/mL) to make a 1 molality solution.
Calculate the freezing point depression of the solution and determine the molality of the solution and molar mass of the solute if a solution is organized by dissolving 138.50g of sucrose, a non-ele
Determine the numbers of molecules of NaCl are in 250 ml of a 5 mM solution? For each mole of substance there are 6.023 x1023 molecules (or number of that substance).
Determine the number of grams of NaCl would you require to add 500 ml of water to make a 5 % solution? Explain in detail.