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4.236-g sample of a hydrocarbon (CxHy) is combusted in O2 completely to give 3.810 g of H2O and 13.96 g of CO2. What is the empirical formula of the hydrocarbon?
When a monosaccharide reacts to give the pyranose form from its open-chain form, how many distinct pyranose forms are possible?
the water solubility of L-alanine is 127g/L at 25 degrees celsius, what is the water solubility of D-alanine at 25 degrees celsius?
A chemistry student needs 80.0mL of acetone for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of acetone is 0.790g cm^-3.
A solution is prepared by adding 0.14 mole Na2HPO4 and 8.2 grams of NaH2PO4 to sufficient water to prepare a 1.00 L solution. What is the pH of the solution?
find the number of moles of water that can be formed if you have 218 moles of hydrogen gas and 104 moles of oxygen gas
A substance has a solubility of 350 ppm. How many grams of the substance are present in 1.0 L of a saturated solution.
what mass of Na2SO4 is needed to prepare 350. ml of a solution having a sodium ion concentration of 0.125 M.
A piston has an external pressure of 11.0 rm atm. How much work has been done if the cylinder goes from a volume of 0.130 liters to 0.460 liters.
Determine the mass in gms for pure Ag sample that loses 2.88kJ if its temperature drops from 143 degree celsius to 28 degree celsius.?
What is the density of a block of marble that occupies 251cm^3 and has a mass of 623g?" answer in units g/cm^3
The extract from solution 3 was found to be 0.0225M in HA. Assume that HA does not associate or dissociate in the organic solvent, calculate
calculate the energy absorbed when 2.67 moles of ethyl ether undergo combustion: CH3CH2OCH2CH3(l) + 6O2(g)-> 4CO2(g)+5H2O(l) delta H=+1604 kJ/mol
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