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A gas occupies 22.4 L at STP and 14.5L at 100 C and 2.00 atm pressure. how many moles of gas did the system gain or lose?
For a solution having .0025 equivalents/liter total alkalinity (contributions from HCO3-, CO3-- and OH- (hydroxide)) at [H+] = 4.69E-11, what is the percentage contribution to alkalinity from CO3--?
If a 200 piece of gold (density =19.32 ) is hammered into a sheet measuring 2.5 by 1.0 ft , what is the average thickness of the sheet in meters?
Calculate Kc for the reaction 2CCl4(g) + O2(g) [3] 1.75 moles of H2O2 were placed in a 2.50 L reaction chamber at 307C. After equilibrium was reached, 1.20.
The density of titanium metal is 4.51g/cm3 at 25C. what mass of titanium displaces 125.0ml of water at 25c.
A 80.0 mL volume of 0.25 M HBr is titrated with 0.50 M KOH. Calculate the pH after addition of 40.0 mL of KOH.
Determine how many moles of carbon dioxide should be combined to the system to bring the equilibrium carbon monoxide concentration to 0.715 mol/L?
the barometer at an indoor pool reads 105 kpa. if the temperature in the room is 30 degrees Celsius, what is the pressure of the air
A single pulse of a laser yields an average of 5.00 × 1018 photons with λ = 633 nm. If melting ice to water at 0°C requires 6.01 kJ/mol, what is the fewest number of laser pulses need to melt 10.0g of ice?
Consider the reaction CaCN2 + 3 H2O ! CaCO3 + 2 NH3 . How much CaCO3 is produced if 47.5 moles NH3 are produced?
Calculate the energy of a photon of wavelength 11.56 meters. (Planck's constant is 6.626 x 10-34 joule seconds; the speed of light is 2.998 x 108 m/s)
Consider the reaction CuSO4(s) ! CuO(s) + SO3(g) . If G? = -14.6 kJ at 950?C for this reaction, calculate G for an SO3(g) pressure of 50 bar at this temperature.
What volume of Cl2 gas, measured at 682 torr and 40 degrees celcius, is required to form 26 g of NaCl ?
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