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Mixtures of helium and oxygen can be used in scuba diving tanks to help prevent "the bends." For a particular dive, 46L He at 25°C and 1.0 atm and 12L O2 at 25°C and 1.0 atm were pumped into a tank with a volume of 5.0L. Calculate: a. the partial pressure of He at 25°C b. the partial pressure of O2 at 25°C c. the total pressure in the tank at 25°C
Calculate the volume (in mL) of He collected at STP when 3.60 g of pure 226Ra is stored in a closed container for 135 years.
calculate the specific heat capacity of a sample liquid if this 100 g sample of an unknown liquid absorbs 2000 j of
Consider a system with four energy levels: 0E, 1E, 2E, 3E, where E is 100K * k (E represents epsilon and k is Boltzmann's constant). Assume that there are 10 particles.
Although the actual process also requires water, a simplified equation for rusting (rust is shown as Fe2O3) is 4Fe(s) + 3O2(g) => 2Fe2O3(s) ?Hrxn = -1.65 x 103 kJ How much heat is evolved when 0.100 kg of iron rusts
when separated from a water solution cuso4 forms a hydrate with 5 water molecules per formula unit. if 36 g of
Is it believed that two carbon-12 nuclei (mass 12.0000 amu) can react in the core of a supergiant star to form sodium-23 (mass 22.989767 amu) and hydrogen-1 (mass 1.007825). Calculate the energy in kJ released from this reaction for each mole of h..
Write a balanced half-reaction for the oxidation of chromium ion (Cr^3+) to dichromate ion (Cr2O7^2) in acidic aqueous solution. Be sure to add physical state symbols where appropriate
What is the number of bonding electron pairs on the central atom of SiH4? What is the number of nonbonding electron pairs on the central atom of SiH4? What is the Molecular Geometry of SiH4
what will be the temperature of the system when equilibrium is established? (sp Heat of H2O(s) = 2.09j/g . c (sp heat of H2O (l) = 4.18 J/g.c) Heat of Fus. of H2O(s)=333j/g
A major source of iron is from the mineral magnetite which is 72.4% iron by mass. If magnetite has a density of 5.20 g/cm3, how many cubic meters
at 30oc the decomposition of hydrogen iodide into hydrogen and iodine is a second-order reaction. the rate constant for
When a voltage of 30 V is applied to the heater for 3.0 min, a constant current of 2.5 A is observed. The calorimeter temperature increases from 20.00C to 25.59C. Calculate C_bomb for the calorimeter. Assume 2000.0 g of water in the bucket.
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