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Calculate the pH of a buffer solution made by adding 10.0 g of anhydrous sodium acetate (NaC2H3O2) to 100mL of 0.100 M acetic acid (HC2H3O2). Assume there is no change in volume on the adding the salt to the acid.
Calculate the percent of a strontium sample left after 100 years. The half-life of strontium-90 is 28.1 years.
Four aldehydes and four hydrazines were used to explore hydrazone antibacterial activity in a combinatorial technique. How many reactions and antibiotic screenings would have been required to carry out this analysis in a non-combinatorial fashion?
give the products (if any) expected from the treatment of each of the following compounds with ozone followed by dimethyl sulfide
how many grams of K2SO4 would you need to prepare 1500g of 5.0% K2SO4 (m/m) solution?
exhales 30.0 times per minute, that the exhaled air is at a pressure of 1.00 atm, and that the air behaves as an ideal gas. Calculate the time in hours before a fire fighter using such an air tank runs out of air.
Do you use the same type of glassware when making solutions of varying molarity? Should you use a volumetric pipette or flask
If several large air bubbles entered the graduated cylinder filled with water when it was inverted into the water trough, what would the effect be on a plot of volume H2(g) vs. mass Mg?
A 10 mL sample of a solution of Pb(ClO3)2 was diluted with water to 21 mL. A 10 mL sample of the dilute solution was found to contain 0.021 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution?
The equilibrium constant for the reaction, 2HI = H2 + I2 is 0.49. Calculate the number of moles of hydrogen produced when one mole of HI
a graduated cylinder reads 4 ml of water.then a shell is dropped into it and the water level rises to 12 ml.what is the volume of the shell?
Calculate the amount of heat needed to convert 96 g of ice at -24C to water at 28C. The specific heat capacity of H2O(s) is 2.1J/g*C.
what is the density of a block of marble that occupies 285 centimeters cubed and has a mass of 636 grams? answer in units of g/centimeters cubed.
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