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0.40 moles of a diprotic acid, H2A, is dissolved in 250 mL of water. The Ka1 of this acid is 1.0 x 10E-5 and Ka2 is 1.0 x 10E-9. What is the concentration of the di-anion, [A^2-], in this solution (in M)?
How many moles of cobalt (Co) atoms are there in 5.00 x 10^9 (5.00 billion) Co atoms? Enter your answer in scientific notation.
A sample of oxygen gas () was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.
How much heat energy is liberated when 11.0 grams of manganese is used in the formation of Mn2O3. PHf° for Mn2O3 is -962.3 kJ/mol
Estimate the percent change in the volume of a sample of glycerol if it is pressurized
The reaction is second order in and has a rate constant of 0.0123 at 25.0 . A reaction vessel initially contains 250.0 of 0.133 which is allowed to react to form the gaseous product.
Determine the adiabatic flame temperature (C). Assume product temperatures of 1500K and 3000K, and then linearly interpolate.
what is the change in temperature of the water after the ice has completely melted? The enthalpy of fusion of water is 6.02 kJ/mol, and the specific heat capacity of the liquid is 4.184 J/g/K. Assume that the amount of extra water produced by the ..
A 0.200 L sample of H2 is collected over water at a temperature of 298 K. Atmospheric pressure is 99.00 kPa. Water has a vapor pressure of 23.00 Torr at this temperature. What is the mass of the sample of gas which was collected
Design a qualitative analysis scheme
Diethyl ether has a deltaH vap of 29.1 kJ/mol and a vapor pressure of 0.703 atm at 25.0 C. What is its vapor pressure at 81.0 C
for the reaction 2CH3CH2CH2CH3(g) + 13O2 --> 9CO2(g) +10H2O(g) delta h = -5285.0 kJ. a) how many kilojoules are released when 27.86 g of butane are burne? Assume that an excess of oxygen is present.
A sample of nitrogen occupies a volume of 250mL at 27 degrees C and 700 mmHg of pressure. What will be its volume at STP?
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