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On average, what percentage of random rolls of three (3) regular playing dice should result in a combined value of 5?
Determine how many pills does the female require to take each time she wants the dosage of 375miliigrams?
What is the maximum concentration (in M) of chloride ions in the solution that contains 0100 M Pb2 +? The Ksp for lead (II) chloride is 1.0 x 10-4.
Calculate the energy required to keep lightbulb burning for 3 hours in each of the energy units of Joules and Kilocalories
Suppose that a sample of gas occupies 162 mL of volume at 25C and a pressure of 291 torr. What would be the volume if the pressure were changed to 503 torr at 25C? Answer in units of mL.
A chemical reaction is known to occur spontaneously under standard conditions. Which of the following statements is/are true (more than one answer may be selected):
An oxygen tank kept at 20 degree C contains 28.0 moles of oxygen and the duage reads 31.0 atm. after two weeks, the guage reads 10.5 atm how many moles of oxygen
A.E. Dyer supplied 45.9 cal of heat energy to a 156-g piece of aluminum block that was kept at 28 degree C. What is the final temperature of the aluminum block?
a solid acid is dissolved in enough water to make 200 ml of a solution. 40 ml of the solution is titrated to a phenolphthalein end point with an NaOH solution.
When 2-propanol was used as the developing solvent, two substances moved with the solvent front (Rf = 1) during TLC analysis on a silica gel plate. Can you conclude that they are identical? If not, what additional experiment would you perform?
If 500 mL of air contains 2 x 1022 particles (atoms and molecules), how many particles do you inhale in one day if you breathe 15000 L of air?
Draw an energy diagram to show the progress of reaction (including reactants, transition state(s) and intermediate (if any). Then explain how the major product was determined.
A compound of potassium had the following percentage composition: K 44.90%; H 0.5787%; P 17.78%. The rest was oxygen. Calculate the empirical formula of this compound
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