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What mass of CCl2F2 substance must evaporate in order to freeze 109 of water initially at 24 degrees celsius? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/gK .)
An unknown metal sample is subjected to a beam of monochromatic light with a wavelength of 322 nm. Electrons are ejected from the metal surface with a velocity of 5.20 x 105 m/s. What is the threshold frequency of the metal?
Assuming that the total pressure of the gases is 1.52 and that their mole ratio is 94 : 4.0 : 1.5 : 0.50, calculate the partial pressure (in atmospheres) of each gas.
A 100. mL sample of 0.10 M HCl is mixed with 50. mL of 0.12 M NH3. What is the resulting pH?(kB FOR NH3= 1.8 x 10^-5)
All ammonium compounds, that comprise the ammonium ion (NH4+) and negative ion, are thermally unstable. Explain two ways that ammonium compounds decompose when they are heated.
A portable electric water heater transfers 255 watts (W) of power to 5.5 L of water, where 1 W = 1 J/s. How much time (in minutes) will it take to heat the 5.5 L of water from 24 degrees C to 41 degress C? (Assume that the water has a density of 1..
Calculate the partial pressure of SO2. Calculate the partial pressure of Cl2. Calculate the equilibrium constant at this temperature.
A 2.89-L flask is filled with propane gas (C3H8), at 1.00 atm and -23.0°C. What is the mass of the propane in the flask?
Determine the final pressure, volume, temperature, and number of moles of gas when the volume is reduced by half at the time when gas is compressed? Use C p /C v = 1.3
Solid sodium peroxide (Na2O2) reacts with liquid water yielding aqueous sodium hydroxide and oxygen gas. How much heat is released
Calculate the molar mass of the uknown compound. The boiling point elevation constant for water is0.52°C/m
1.0 atm pressure of oxygen is 0.041g/L. The solubility of oxygen in water at 3.0 atm and 25 C is _____ g/L.
A piston has an external pressure of 5.00 atm. How much work has been done if the cylinder goes from a volume of 0.130 liters to 0.540 liters.
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