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Why it is important for isotopes to have short half lives when used in medicine.
Why water has a higher boiling point than alcohol even hough water is a smaller molecule.
What type of electrical conductivity in a solution of an organic compound.
A student recovers 300 mg of trimyristin from her nutmeg sample. If this represents 20 % recovery, how much nutmeg did she start the experiment with assuming that trimyristin represents about 25% of the dried weight of ground nutmeg?
A laboratory manager wants to prepare 500.00 mL of a buffer with a pH of 5.280 from equimolar solutions of CH3CO2H (Ka = 1.800e-5) and LiCH3CO2. What volume of the CH3CO2H solution would be required
Calculate the percent by mass of the solute in each of the following aqueous solutions. (a) 3.57 g of NaBr in 78.2 g of solution % (b) 31.0 g of KCl in 144 g of water % (c) 2.8 g of toluene in 29 g of benzene %
a student titrates 50ml apple juice and reports the following inthe titration to the phenolphthalein end point with
Explain if a 0.2 L sample of moist air has been collected over the lake. Compute the percent by mass of water vapor if the barometric pressure was 748mmHg and the temperature of the lake 21ºC. If the molar mass of air is Mair =29g/mol.
question differentiate between alkenes and alkynes cis isomers and trans isomers. describe how cis- trans isomers are
The mitochondrion has two membranes, the inner and outer- the outer membrane is porous and enables many molecules to freely diffuse. The inner membrane is different from the outer membrane as it is only penetrable to o2
An empty vial has a mass of 67.77 g. If the vial has a mass of 244.56 g when completely filled with liquid carbon terachloride (d = 1.59 g/cm3), what is the volume of the vial?
What is the difference between a state and a microstate of a system? As a system goes from state A to state B, its entropy decreases What can you say about the number of microstates corresponding to each state?
The relative molar mass of an element is known to be 32.064 g. Determine the abundance fraction of the isotope whose fraction is not displayed in the table.
How much does the atmosphere weigh over each square kilometer (km2)? Recall that 106 m2 = 1 km2 .
A mixture of 82.49 g of aluminum (MM = 26.98 g/mol) and 117.65 g of oxygen (MM = 32.00 g/mol) is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.
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