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calculate the enthalpy change for the complete combustion of but-1-ene, according to the following equation:
C4H8+6O2 yields 4CO2+4H2O
a student pumped some helium gas into a balloon. when this balloon was connected to an open ended U-tube containing some oil (density=9.18 g cm-3 the oil was displaced 112 mm towards the atmosphere. what is the pressure of the helium inside this b..
if you have 330 ml of water at 25.00 and add 120ml of water at 95 C what is the final temperature of the mixture
For the same atoms at the lattice points, which lattice exhibits the lowest density? (please explain your reasoning) (A) body-centered cubic (B) face-centered cubic
A system absorbs 192 kj of heat and the surroundings do 120 kj of work on the system. what is the change in internal energy of the system
How many grams of dry NH4Cl need to be added to 2.10L of a 0.500 M solution of ammonia, , to prepare a buffer solution that has a of 8.84? Kb for ammonia is 1.8*10^-5.
a 5.0 dm3 sample of oxygen at a pressur of 200 kpa and 2.0 dm3 sample of nitrogen at a pressure of 500 kpa are introduced into a 2.5 dm3 vessel. what is the total pressure in the vessel?
.56 g of a specific gas are held at 101 degrees Celcius and 800 torr in a volume of 285 mL. Determine the molecular weight of the gas.
a sample of a compound containing only magnesium and oxygen is found to have 194g Mg and 256g of O. What percentages of Mg and O in this compound?
solution made from 6.50g of an unknown compound in 27.8g of diphenyl has a molality of .195m. Calculate the molar mass of the unknown.
Explain different moderators used in nuclear reactors
An unknown solid compound containing Pb2+ ion was mixed with 15 mL of 2.0 M HNO3. The mixture bubbled profusely. After complete reaction, it was found that 0.020 moles of CO2 were produced and the original solid was completely consumed.
sodium bisulfite is a reducing agent. write a balanced oxidation reduction reaction equation for the reaction that occurs
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