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In the recrystallization procedure, an Erlenmeyer flask is commonly used during the step in which the crude is dissolved in the solvent of choice. Furthermore, if the recrystallization is slow typically the flask is closed with a cork. What do you think is the reason for using a cork and not a plastic stopper (which would seal the flask better)
moles of benzoyl peroxide and another person used the same amount of benzoyl peroxide as the first person but only used 150 moles of styrene, what would be the average molecular weight of each groups polymer sample be?
a sample of chlorine gas occupies a volume of 946ml at a pressure of 726mmhg. Calculate the pressure of the gas in (in mmhg) if the volume is reduced at constant temperatures to 154ml.
according to equation, how many grams of Zn will remain after the reaction is complete? Equation [5] = CuSO4 (aq) + Zn (s) ----> ZnSO4 (aq) + Cu (s)
a sample contains both KBr and KI in the unknown quantities. If the sample has a total mass of 5.00g and contains 1.51g K, what are the percentages of KBr and KI in the sample by mass?
Under standard-state conditions, what spontaneous reaction will occur in aqeuous solution among the ions
What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution?
Decomposition of nitric acid NO to N2 and O2 is second order with a rate constant of 0.0796 M-1 s-1 at 737 degrees C and 0.0815 M-1 s-1 at 947 degrees C. Calculate the activation energy.
Calculate the concentration of chloride ions when 100.0 mL of 0.205 M sodium chloride is mixed with 250.0 mL of 0.150 M calcium chloride.
For the reaction CO+O2 -> CO2 , what is the maximum amount of CO2 (44.0095 g/mol) which could be formed from 16.73 g of CO (28.0101 g/mol) and 0.251 mol of O2 (31.9988 g/mol)? Answer in units of mol
magnesium hydroxide is 54.87 oxygen by mass.How many grams of oxygen are in 175 g of the compound?How many moles of oxygen is in this.
When 0.060 mol of propionic acid, C2H5CO2H, is dissolved in 500 ml of water, the equilibrium concentration of H3O+ ions is measured to be 2.41 x 10-3 M. What is Ka for this acid?
How many grams of ammonium chloride and how many milliliters 3.0 M sodium hydroxide should be added to 200 ml water and diluted to 500 ml to prepare a bufffer
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