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A saturated solution of Na2SO4, with excess of the solid, is present at equilibrium with its vapour in a closed vessel.
(a) How many phases and components are present.
(b) What is the variance (the number of degrees of freedom) of the system? Identify the independent variables.
Assuming 100% dissociation, calculate the freezing point and boiling point of 2.75 m K3PO4(aq).
The half-life for the second order reaction of a substance A is 55 seconds when [A]o is 0.84 M. What time is needed for the concentration to decrease to 1/4 of the original value.
An iron bar of mass 965 g cools from 94°C to 5°C. Calculate the heat released (in kilojoules) by metal.
M+ is added to a solution of 0.0035 M X- and 0.0016 M Z-. MX has Ksp = 8.2 × 10^-9, while MZ has Ksp = 1.7 × 10^-10. What percentage of the Z- is still in solution (not precipitated) when the MX just starts to precipitate? Answer in units of %.
What volume in L is occupied by 19.62 g of methane, CH4 (MM = 16.04 g/mol) at 23 °C and 1.34 atm?
For organic chemistry, what is a concerted shift? how do things like acids or heat affect them? what other factors effect them?
If 50 mL of the solution from part a is added to each of the beakers shown here(i through iv), in which beakers, if any, will a precipitate form? State water and mixture is allowed to come to equilibrium
A mass of 1.37 g of an unknown gas is introduced into an evacuated 1.70 L flask If the pressure in the flask is 0.814 atm at 98 degrees C, which of the following gases might be in the flask?
A 10.9-g mixture of nitrogen and carbon dioxide is found to occupy a volume of 8.88 L when measured at 641.9 mmHg and 28.5oC. What is the mole fraction of nitrogen in this mixture?
Buffering capacity You want a solution that will buffer the addition of either 10 micromoles of acid or 10 micromoles of base. Total buffer concentration is equal to the concentration of the acid plus the concentration of salt of the acid
its molar mass is 71.61 g/mol, how many grams of this compound must you burn to release 866.80 kJ of heat?
What is the molality if a solution in which 15 g of I2 is dissolved in 500. g of alcohol?
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