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1. When 26 mL of a 375 mL stock solution containing 2.1 M CaCl2 is diluted to 103 mL, how many moles of Ca2+ are in the new solution?
2. How many milliliters of a 220 mL solution of 1.5 M AlCl3 must be used to make 61 mL of a solution that has a concentration of 0.3 M Al3+?
3. A 9 mL sample of a solution of AlBr3 was diluted with water to 25 mL. A 17 mL sample of the dilute solution was found to contain 0.042 moles of Br-. What was the concentration of AlBr3 in the original undiluted solution?
The value of the euro was recently $1.38 u.s. and the price of 1 liter of gasoline in france is 1.35 euro
A 1.0 ounce piece of chocolate contains 15 of caffeine, and a 6.0 ounce cup of regular coffee contains 105 of caffeine.How much chocolate would you have to consume to get as much caffeine as you would from 5.0 cups of coffee?
what is the molar mass of the protein? A solution of 7.50 mg of a small protein in 5.00 ml of aqueous solution has an osmotic pressure of 6.80 torr at 23.1 degrees celcius.
0.400 L of an aq ethanol solution was diluted to a total volume of 4.00 L by adding water, giving a final concentration of 0.0400 M. What is the concentration of the original solution?
Calculate the bond order in the following species. Predict which of the two species in the following pairs has the higher vibrational frequency:
an acetic acidacetate buffer system would be the best choice for experiments at ph 5.00. what mass of sodium acetate
Determine how many milligrams of H 2 O are present in sample If the freezing point of a 100.0g sample of 2-methyl-2-propanol =24.59C?
A sample of CH4 gas is observed to effuse through a pourous barrier in 5.08 minutes. Under the same conditions, the same number of moles of an unknown gas requires 8.63 minutes to effuse through the same barrier.
what is a an unknown liquid substance that is insoluable in water and soluable in cyclohexane and ethyl alcohol with a
What is the pH of a 5.52E-04 M solution of HCl. Report your answer to two places past the decimal point. WebAssign will check your answer for the correct number of significant figures
The standard reaction enthalpy for the decomposition of CaCl2_NH3 into CaCl2 and NH3 is nearly constant at +78 kJ/mol between 350 K and 470 K.
1. which pair of esters is most likely to provide a useful claisen synthesis.2. which is the major product formed in
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