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If equal amounts of Na2HPO4 and Na3PO4 are added in water, calculate the resulting pH. The pKa's of phosphoric acid are 2.1, 7.2, and 12.4
In an experiment, 1.26 grams of iron combines with oxygen to give a compound that has a mass of 1.80 grams. What is the empirical formula of the compound?
PVA (polyvinyl alcohol) strands can form hydrogen bonds between different parts of the same strand. Illustrate how this can occur by using a sketch to show the hydrogen bonding.
A 100g sample of water at 27oC is poured into a 76.2g sample of water at 89oC. What will be the final temperature.
How many grams of NaOH would you need to prepare 500mL of a 1M solution (assume 100% purity of the base)? M= (# of moles / L of solvent)
what is the molarity of acetic acid in vinegar when 19.9 mL of NaOH neutralized vinegar and the molarity of NaOH is 0.2175?
In the information of smog, nitrogen and oxygen gas react to form nitrogen dioxide. How many grams of NO2 will be produced when 2.0 L of nitrogen at 840 mmHg and 24 degrees C are completely reacted
calculate the molarity of acetic acid in a vinegar sample knowing that 5.00 mL of vinegar requires 43.50mL of 0.105M NaoH to just reach the phenolphtalein endpoint in a tritration
The value of ?Ho for the reaction below is -126 kJ. The amount of heat that is released by the reaction of 25.0 g of Na2O2 with water is ________kJ. 2Na2O2 (s) + 2 H2O (l) -> 4NaOH + O2 (g)
You will encounter a simiar mixture in this experiment. The solubility product constants for ZnS and CuS are 1.1x10^-21 and 6x10^-36, respectively. A.) Show that both ZnS and CuS will precipitate at pH8. B.) Show that only CuS will precipitate whe..
A penny with a scored edge allows the HCl to react with the internal zinc metal, leaving a shell of unreacted copper. How many moles of hydrogen gas are formed by reacting a penny with excess HCl?
Determine the empirical formula of a compound that is 52% carbon, 13 % hydrogen, and 35 % oxygen. What is the moleuclar formula is the molecular weight of the compound is 46.06 g/mol?
Given that the enthalpy of formation is -277.7 kJ/mol for C2H5OH(l) and -393.5 kJ/mol for CO2(g), find the enthalpy of formation for C6H12O6.
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