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A concentration cell consists of two H2/H+ half cells. Half cell A has H2 at 0.87 atm bubbling into 0.10 M HCl. Half cell B has H2 at 0.45 atm bubbling into 2.2 M HCl. What is the voltage of the cel
Isotope 1 has a mass of 120.9038 {rm amu} and a relative abundance of 57.4%, and isotope 2 has a mass of 122.9041 {rm amu}. What is the atomic mass of this element?
What is the molarity of a solution of silver perchlorate, AgClO4, if 3.2 moles of silver perchlorate is dissolved in 1.5 liters of water? Is it 2.133 M, 4.756 M, 4.8 M, or 4.810 M ?
A compound is constituted by mass of 22.6% phosphorus, the rest being chlorine. Given that a volume of 307 mL of the gas has a mass of 1.55 g at 25 °C and 90 kPa, find the molecular formula for
Assuming that the specific heat capacity of the solution is 6.37J/degree celcius g and the density of the final solution is 2.00 g/mL, calculate the enthalpy change per mole of BaSO4 formed.
Ascorbic acid (vitamin C,c6h8o6) is a water-soluble vitamin. A solution containing 80.5 g of ascorbic acid dissolved in 200 g of water has a density of 1.22 g/ml at 55 c.
If 35.0 mL of NO2 gas is completely converted to N2O4 gas under the same conditions, what volume will the N2O4 occupy?
What is the concentration of N2 gas at equilibrium when the concentration of NO2 is three times the concentration of O2 gas.
Methane has a Henry's Law constant (k)of 9.88 × 10-2 mol/(L·atm) when dissolved in benzene at 25°C. How many grams of CH4 will dissolve in 3.00 L of benzene if the partial pressure
What will the volume of the container be after it is cooled in liquid nitrogen to -196 °C while remaining at a pressure of 1.00 atm?
A student weighs out 10.000g of MgSO4 from a bottle. After heating, the sample mass was 5.720g. How much water should the reaction produce?
calculate the molecular mass of the nonionic solutes: 64.3 grams of solute in 3.90 x 10^2 grams of water raises the boiling point to 100.680 degrees celsius.
Find the Ka for benzoic acid (C6 H5COOH and then find pH of a buffer solution that is prepared with 100 mL of 0.10 M benzoic acid mixed with 100 mL of 0.10 sodium benzoate (NaC6 H5COO) solution.
A gas mixture contains helium and oxygen at respective partial pressures of 255 torr and 0.450 atm. What is the total pressure in mm Hg of the mixture?
used the 8900 kilojoules you expend in energy in one day to heat 50000 of water at 20, what would be the rise in temperature?
Calculate the mass of helium that it would take to fill the balloon. Be sure to follow significant figure rules when calculating the answer.
At 80 deg C the vapor pressures of pure liquids X, Y, Z are 385, 190, 66 mm Hg, respectively. What pressure must be exerted on the surface of a solution containing one mole of X, three moles of Y, a
Given the equation A(aq) + 2B(aq) 3C(aq) + 2D(aq). 45.0 mL of 0.050 M A is mixed with 25.0 mL 0.100 M B. At equilibrium the concentration of C is 0.0410 M. Calculate K.
In an experiment similar to the empirical formula experiment in the lab book, a student reacted beryllium and oxygen from the air. The initial mass of beryllium was 0.915 g. The final product had a
It takes 217 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be used to eject electrons from the surface of this metal via the photoele
Given 1.50g of NH3 reacts with 2.75g of O2 which is the limiting reactant? How many grams of the excess reactant remain after the limiting reactant is completely consumed?
Calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with n = 5 in a one-dimensional box 39.8 pm in length.
Calculate the molar mass of a nonelectrolyte that lowers the freezing point of 25.00 g of water to -3.9 degrees Celsius when 4.27 g of the substance is dissolved in the water.
A sample of pure NO2 is heated to 336 degree Celsius at which temperature it partially dissociates according to the reversible equation.
A zero-order reaction has a constant rate of 2.50×10-4 . If after 35.0 seconds the concentration has dropped to 1.00×10-2 , what was the initial concentration?