Reference no: EM13516906
1. A sample gas has a volume of 200cm^3 at 25 degrees celsius and 700mmHg. If the pressure is reduced to 280mmHg, what volume would the gas occupy at the same temperature?
2. A certain noble gas compound contains 68.8% Kr and 31.2% F by mass. Its density at STP is 5.44g/L. What is the molecular formula of the compound?
3A. What volume of CO2 at 1 atm and 225 degrees celsius would be produced by the reaction of 12.0g NaHCO3? 2NaHCO3+H2SO4=Na2SO4+2CO2+H20
(B). On cooling to 20 degrees celsius, what volume would the CO2 occupy?
4. Determine the molar mass of a gas if a sample weighing 0.495g is collected as vapor(gas) in a flask of volume 127cm^3 at 98 degrees celsius. The pressure of the gas vapor at this temperature in the flask was determined to be 754mmHg. Identify the gas.
5. If 10ml of 1.0 M HCL are required to neutralize 50ml of a NaOH solution, how many ml of 1.0 M H2SO4 will neutralize another 50ml of the same NaOH solution?
6. How many liters of ammonia at a pressure of 10 atm and 500 degrees celsius can be produced by the reaction of 6.0g of hydrogen with excess N2? Given 3H2(g) + N2(g)=2NH3(g)
7. When the aqueous solution of Pb(NO3)2 and Na2SO4 are mixed a precipitate of PbSO4 is formed. Calculate the mass of PbSO4 formed when 655ml of 0.150 M Pb(NO3)2 and 525ml of 0.0751 M Na2SO4 are mixed. Given Pb(NO3)2 + Na2SO4= PbSO4 + 2NaNO3.
8. Give half reactions for 2Mg+CO2=2MgO+C and classify the reaction Pb(NO3)2+H2S=PbS+2HNO3
Explain the born-oppenheimer approximation
: Justify the Born-Oppenheimer approximation based on vibrational frequencies and the timescale for electron motion.
|
Explain what aspects of the model can be tested
: What aspects of the model can be tested by experiments, and what aspects are conjectures that are not amenable to experimental verification
|
Find how far has the tuning fork fallen
: A physics student drops a vibrating 450 Hz tuning fork down the elevator shaft of a tall building. how far has the tuning fork fallen
|
The nitrous oxide n2o is a strong greenhouse gas-effect gas
: Nitrous Oxide N2O is a strong greenhouse gas-effect gas with a global warming potential of 300 times that of carbon dioxide and is a contributor to the destruction of ozone in the stratosphere
|
Define the molecular formula of the compound
: A certain noble gas compound contains 68.8% Kr and 31.2% F by mass. Its density at STP is 5.44g/L. What is the molecular formula of the compound
|
Find the shear strain
: A square steel plate is 0:20 m on a side and 4:00 mm thick. Find the shear strain that results if a force of magnitude 8x10^4 N applied to two of the four long sides parallel to the sides
|
Explain the forward process endothermic or exothermic
: The ion-product constant for water is 1.0x10^-14 at 25 degrees Celsius and 3.8x10^-14 at 40 degrees Celcius. Is the forward process endothermic or exothermic. H2O is equal to H+ + OH-
|
How fast are these protons moving
: A cyclotron particle accelerator (sometimes called an "atom smasher" in the popular press) is a device for accelerating charged particles, How fast are these protons moving when they hit the tumor
|
Resurgence of islamic fundamentalism
: There has been a resurgence of Islamic Fundamentalism (or revivalism) in Afghanistan, Iran and other parts of the Muslim world. Explain what you feel is the cause of this resurgence and whether you believe liberal democracy requires secularization of..
|