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To get hold of 8.0g of potassium dichromate from a solution labeled 5.0% by mass, explain how many grams of solution are needed?
Ethylene glycol (EG) is a commonly used automotive antifreeze. Calculate the boiling point and the freezing point of the 25% EG solution if Kb=0.512oC/m and Kf=1.86oC/m for water. Molar mass of EG=60.05 g/mol.
Show the overall reaction of racemic 3-bromohexane from (E)-3-hexene by entering the structures of the products and reactants in the template provided. (E)-3-hexene (S)-3-bromohexane (R)-3-bromohexane
Europium crystallizes in a body-centered cubic lattice (the Eu atoms occupy only the lattice points).The density of Eu is 5.26 g/cm3. Calculate the unit cell edge length in pm.
The equilibrium constant is always greater than one for an extensive reaction 6.The value of q is always equal to the value of w for a reversible reaction 7.The energy change of the universe for any spontaneous process is always positive
Find the mass of the substance and the volume of a gas in a reaction - determine the mass of solid ammonium nitrate that must be used to obtain 0.145 L of dinitrogen oxide gas at STP.
How many grams of water can be cooled from 37 C to 20 C by the evaporation of 45 gm of water?
for each of the following positive ions use the concept that a chemical compound must have a net charge of zero to
A single sp^3 hybrid orbital has a) one lobe b) two lobes of equal size c) two lobes of unequal size d) four lobes of equal size
The random walk model used to describe gas diffusion can be treated as a binomial distribution similar to coin flips with a 50/50 chance that a particle will move in either the +x direction or the -x direction.
how many moles of nh42so4 are there in 100.00 g of ammonium sulfate? how many moles of ammonium ions are in 100.00 g of
At a certain temperature a reaction that follow first order kinetics has a rate constant of to be equal to 2.5*10^-3 s^-1 the time in seconds required for the reaction to be 60% complete is
suppose that after delivery several drops of the water cling to the inner wall of the pipet because the pipet wall is
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