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You have one liter of a normal saline solution (308mOsm) and you add 10 milli moles of MgCl2 (.95g). What is the effect on the osmolality of the solution?
A patient needs to take 625mg of ibuprofen twice daily. The pills in the bottle are each 250. mg. How many pills does the patient need to take each time she wants the 625mg dosage? Assume that these
After heating, the evaporating dish and dry NaCl have combined mass of 25.50 g. How many grams of sodium ion Na+ are in 1.50g toothpaste?
What would have happened to the measured volume of the hydrogen gas collected if you did not wait 3 minutes after the process ended to record the new volume?
A pharmacist is to prepare 15ml of special eye drops for a glaucoma patient. The eye-drop solution must have a 2% active ingredient, but the pharmacist only has 10% solution and 1% solution in stock
A mixture of gases contains 6.85 g of N2, 1.95 g of H2, and 5.71 g of NH3. If the total pressure of the mixture is 1.83 atm, what is the partial pressure of each component?
A beaker has a mass of 225.08 g. When a liquid is added to the beaker, the combined mass is 238.254 g. What is the mass in grams of the liquid .
A .5865 g sample of lattice acid is burned in a calorimeter whose capacity is 4.812 Kj/c. The temp raises from 23.10c to 24.95c.
Calculate the mass percent, molality, mole fraction, and normality of the citric acid. Citric acid has three acidic protons.
Bromine has Pvap = 400 mm at 41.0 °C and a normal boiling point of 331.9 K. What is the heat of vaporization, ΔHvap, of bromine in kJ/mol?
Lysozyme is an enzyme used to cleave cell walls. A solution made by dissolving 0.0750 g of lysozyme in 100.0 mL results in an osmotic pressure of 1.32 x 10-3 atm at 25 °C. Calculate the molar ma
If the pressure builds to 3.75 atm at a temperature of 21.1oC, what is the final volume of the bag after 4.97 minutes?
The equilibrium constant for the second reaction is 10^26.4. Ksp = 10^-26.4 for the reverse reaction. What concentration of Fe3+ is needed to maintain the phosphate concentration below the limit of
Vitellium (Vi) has the following composition: Based on this data, what can you predict about the average atomic mass of vitellium?
Mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. How many moles of CO2 must be added to the system to bring the equilibrium CO concentration to 0.768 mol/L?
Element X has two naturally occurring isotopes of masses 106.905 amu and 108.905 amu. The percentage abundance of these two isotopes are 51.83 % and 48.17 % respectively. What is the average atomic
A offscale solution #2 1.00 mL stock diluted to 25.00 mL -A = 0.85 solution #3 1.00 mL #1 diluted to 25.00 mL -A = 0.73 What are the concentrations of solution #3, and of the stock solution?
The addictive drug morphine, C17H19NO3, is used for the treatment of pain. What is the total number of atoms in the chemical formula?
A 339mL sample of unknown HCl solution reacts completely with Na2CO3 to form 12.1g CO2. What was the concentration of the HCl solution?
What phase or phases are present when 162 kJ of energy is removed from this sample? Specific heat capacities: ice, 2.1 J/g·°C; liquid, 4.2 J/g·°C; steam, 2.0 J/g·°C,
what is the molar concentration of a solution, 2.79grams of a nonelectrolyte solute is dissolved in water to make 235 mL of a solution at 29 celcsius the solution exerts an osmotic pressure of 927 t
Which species appear to benefit from increasing fragmentation? Which species are negatively impacted? Based on your knowledge of environmental science, what could explain these observations? S
Calculate the mass in grams for a sample of aluminum that absorbs 1.70kJ when its temperature rises from 56°C to 177°C.
Consider the titration of 50.0 mL of 0.200 M HClO4 by 0.100 M NaOH. At what volume (in mL) of NaOH added does the pH of the resulting solution equal 7.00?
Calculate the mass in grams for pure silver sample that loses 2.88kJ when its temperature drops from 143°C to 28°C.