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The concept of limiting reactant is a very important one in Chemistry. Explain what the concept of limiting reactant means and give an example of a limiting reactant everyday-life situation.
A buffer is prepared by mixing 500 ml of 0.4 M Na2HPO4 with 500 ml of 0.2 M NaH2PO4. what is the pH of this buffer? What would be the final pH if you added the same quantity of acid to 1 litre of H2O (pH 7)
What NaCl concentration results when 234 mL of an 0.640 M NaCl solution is mised with 6.52 mL of a 0.450 M NaCl solution
a 25 ml sample of .147 m propionic acid hc3h5o2 is titrated with .104 m koh solution. the equivelence point is reached
How much heat (in kJ) is evolved in converting 1.00 mole of steam at 145 C to ice at 0 C)? (The heat capacity of ice is 2.09 J/g C and the heat of vaporization of water is 32.9 kJ/mol)
At a temperature of 250K, the molecules of an unknown gas, Z, have an average velocity equal to that of HI at 500K. What is the identity of the gas
Using acetylene as your ONLY source of carbons, show how you would synthesize the following compound. Note: any alkyl halides, alcohols
(a) Estimate the time required to reach stationary phase. (b) What will be the final cell density if the fermentation is stopped after only 70% of the substrate is consumed?
Depict the mechanism of the free radical chlorination of cyclohexane to form 1,2-dichlorocyclohexane. Utilize signle-barbed arrows to show the direction of movement of single electrions. Label all steps chain-initiating and others.
one swimmer in a relay race has a 0.485 s lead and is swimming at a constant speed of 3.84 ms. he has 48.5 m to swim
How many moles of HCl must be added to 1.0 L of 1.0 M NH3(aq) to make a buffer with a pH of 9.00? (pKa of NH4^+ = 9.25)
Suppose the reaction Pb(s) + 2H^+(aq) ? Pb^2+(aq) + H2(g) is carried out at pH = 4.00 and at a hydrogen gas pressure of 1.00 atm. The concentration of lead(II) ions that causes this reaction to be at equilibrium is
A 20 degrees Celsius, the solubility of potassium nitrate is 30g in 100g of water. A 35 gram solution of potassium nitrate in water was determined to contain 10 grams of KNO3
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