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To prepare a buffer pH= 4.0 using formic acid (pKa= 3.75), what is the molar ratio needed between the free acid and the conjugated base?
Explian why melting points are important in ochem. think about how you can identify a compound.? Explian why reflux is an important techniques in ochem.Think about energy needed to carry out a reactio
For this reaction identify the atoms that are oxidized and reduced, and specify the oxidizing and reducing agents.
A sample of dry air of a total mass of 1.000g consistsof 0.760 g of Nitrogen and 0.240g of oxygen. Calculate the partial pressures of the gases and the total pressure ( in atm) when this sample is i
The vapor pressure of water at 20degreesC is 17.5 mmHg. What is the vapor pressure of water over a solution prepared from 2.00 x102g of sucrose(C12H22O11) and 3.50 x102g water?
1.02g of acetylsalicylic acid was obtained from 2.00g ofsalicylic acid by reaction with 2.0g of acetic an hydride. Calculate the present yield of acetylsalicylic acid.
How many millimoles of sodium hydrogen are present in 28.6 mLof 0.150 m NaOH? How many grams of NaOH are present?1.6 g of salicylic acid was reacted with 1.5 g ofacetic anhydride was used in a the
How many grams of sucrose must be added to 320 g of wateto lower the vapor pressure by 1.5mm Hg at 25 degrees C? The vapor pressure of water at 25 degrees C is 23.8 mmHg and the molar mass of sucro
A dilute sugar solution prepared by mixing 8.0 g of an unknown sugar with sufficient water to form 0.200L of solution is found to have an osmotic pressure of 2.86 atm at 25 oC. What is the molar mas
A particular gaseous hydrocarbon that is 82.7% C and 17.3% H bymass has a density of 2.33g/L at 23oC and 746 mmHg. What is the molecular formula of this hydrocarbon?
Why does the addition of Br to trans-cinnamic acid take place more slowly than the addition of Br2 to 3-hexene or cyclohexene?
Several factors are involved in determining the cooking times required for foods in a microwave oven. One of these factors is specific heat.
Hypochlorous and hypotromous acid (HOCl and HOBr) are weekacid. Write equations for the ionization of each in water and predict which one is the stronger acid.
When copper metal is added to silver nitrate in solution, silver metal and copper(II)Nitrate are produced. What mass of Silver is Produced from 178g of cu?
Roughly speaking, the radius of an atom is about 10,000 times greater that that of its nucleus. If an atom were magnified so that the radius of its nucleus became 3.0cm, what would be the radius of
You are told that an acid is either hydrochloric acid orperchloric acid. What simple test could you carry out to tell which acid it is?
Asolution of acetic acid is prepared in water by adding 11.1 g of sodium acetate to a volume flask and bringing the vol up to 1L with water. the final ph is 5.25 what is the concentrations of aceta
It is 726 miles here to Chicago. An obese Chemistry professor jogs at a rate of one mile every twenty minutes. How long would it take him to jog to Chicago if he jogged continuously and really wante
For a reaction of the form, A + B + C Products, the following observations are made:tripling the concentration of Aincreases the rate by a factor of 3,doubling the concentration of B has no effect o
An Industrial process called Catalytic cracking is used to converthigh-molecular-weight hydrocarbons to low-molecular-weight hydrocarbons. A petroleum company has a huge supply of heating oilstored
Americium-241 is widely used in smoke detectors. The radiation released by this element ionizes particles that are then detected by a charged-particle collector. The half-life of 241 Am is 432.2 yea
To determine the pI of an amino acid or a peptide, why is important to know both the structure and the pKa of the functional group instead of just the pKa?
We burn 16.0 liters of ammonia in 29.3 liters of oxygengas at 500 degree celcius. what volume of nitrogen monoxide gas canform? what volume of steam, H2O (g) can be produced?
You are given a white solid and told that it is either calciumnitrate or lead(II) nitrate. Explain what you would do todetermine the identity of the solid?
Assayed for LDH activity were 5μL of a sample that wasdiluted 6 to 1. The activity in the reaction vessel, which has avolume of 3ml, is 0.30U. what is the ΔA/min observed? what is the relat