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The pentose phosphate pathway converts glucose to the ribose-5-phosphate needed for DNA synthesis. What other pentose phosphate pathway product is required for DNA synthesis?
Determine the empirical formula of a hydrocarbon which has 92.24% C and 7.76% H. If 0.500 g of this hydrocarbon occupies 0.086 L at STP, determine the molecular weight of the compound.
if 2.325g of an unknown acid compound is made up to 200.0 mL with water. 10.00 mL of the resulting solution requires 15.43 mL of 0.1808 M NaOH. Caculate the molar mass of the unkown acid compound as
You have a 48.9 g sample of water at the temperature of -60.0 degrees celcius. How much energy is required to: heat the ice to 0 degrees celcius (specific heat: Cp of ice is 2.06 j/g degrees celcius)
at 700 celcius is 0.76 atm. Determine the initial pressure of carbon tetrachloride that will produce a total equilibrium pressure of 1.20 atm at 700 celcius.
Calculate the final temperature when a 16.4 gram sample of ice at 0oC is placed into a styrofoam cup containing 126 grams of water at 72.7 oC. Assume that there is no loss or gain of heat from the
Predict the amount of HCl and NaOH will be used based on the concentrations of weak acid/conjugate base or weak base/conjugate acid used to make each buffer.
Buffer capacity relates to the concentration of acid/conjugate base present. How is the relative buffer capacity to absorb H+ and OH- for the 1:1 and the 3:1 acidic and basic buffers?
Calculate the percentages of dissociated and undissociated forms present in the following solutions: A) 0.0010 M glycolic acid (HOCH2CO2H; pka = 3.83) at pH = 4.50
Calculate the percentage of HSO4- that is ionized in this sample, given that the acid dissociation constant for the second stage of ionization of H2SO4 is 1.2E-2.
A titration to determine the Ksp of MgCO3 is done by adding 0.030M MgCl2 to 50.0mL of 0.010M Na2CO3. The titration requires 10.50mL to observe the first visible precipitate. Calculate the solubilit
What is most common chemical method for removing H3O+ ions in aqueous solution?
Write a mathematical equation for the rate of reaction as related to the concentration of oxalic acid (H2C2O4) and the rate of reaction to the concentration of permanganate (MnO4-).
Two compounds of nitrogen tetroxide(N2O4) and hydrazine(N2H4) are used as rocket fuels. When the two are mixed, they ignite and produce nitrogen gas and water. Find the limiting reactant, mass of N
How many joules of energy are necessary to heat the steam from 100 degrees celsius to 114 degrees celcius if the specific heat of steam is 2.01 j/g degrees celcius?
A cumbustion analysis was carried out on 1.621g of newly synthesize compound which was known to contain only carbon,hydrogen and oxygen. The masses of H20 and carbondioxide produced were 1.902g and
When the leak was discovered and repaired, the tank had lost 76.0 g of the gas. What was the pressure of the gas remaining in the tank at 25°C?
The heat of combustion of cyclobutane, C4H8, is 650.3 kcal/mol. Write a balanced equation for the complete combustion of cyclobutane.
The density of Gold is 19.31 g/cm3 and the density of Platinum is 21.43 g/cm3. Which graduated cylinder would have the greatest volume change? Explain.
A 27.0-g sample of water at 250. K is mixed with 47.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
Consider the hydrazinenitrogen tetroxide rocket fuel reaction: How many grams of N2H4 will be consumed by 46 g of N2O4?
An amonio acid has the molecular formla C2H5NO2. what is the empirical formula?
A handbook lists the aqueous solubility of carbon monoxide at 0 C and 1 atm CO pressure at 0.0354 mg. What would be the molarity of CO in water at the normal partial pressure of CO in air of 0.00036 a
A 2.50-g sample of a large biomolecule was dissolved in 12.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecu
If 17.0 mL of 0.800 M HCl solution are needed to neutralize 5.00 mL of a household ammonia solution, what is the molar concentration of the ammonia?