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Calculate the molality of C2H5OH in a water solution that is prepared by mixing 50.0 mL of C2H5OH with 108.4 mL of H2O at 20°C. The density of the C2H5OH is 0.789 g/mL at 20°C. (Assume the density of water at this temperature is 1.00 g/mL.)
a. 0.0100 m
b. 0.149 m
c. 0.127 m
d. 7.90 m
e. 10.0 m
How long does it take to deposit a coating of gold 1.00um thick on a disk-shaped medallion 4.00 cm in diameter and 2.00 mm thick at constant current of 89 A?
Which of the following refers to particularly stable arrangements of amino acid residues in a protein that give rise to recurring patterns
The solution was then titrated to a blue-black endpoint with 26.0mL of a 0.0163 M KIO3 solution. How many mg of Vitamin C were in the tablet ?? and what % of the powder was Vitamin C?? Please solve this out for me
Phosphorus-32 has a half-life of 14.0 days. Starting with 8.00 g of 32 P, how many grams will remain after 112 days?
If more NH4HS is added to a flask in which this equilibrium exists, how is the equilibrium affected? What is some additional NH3 is placed in the flask? What will happen to the pressure of NH3 if some H2S is removed from the flask?
For each of the following reactions, calculate the grams of indicated product produced when 20.0 g of each reactant is used: a) 4Al(s)+3O2(g)-->2Al2O3(s) (Al2O3). b) 3NO2(g)+H2O(l)-->2HNO3(aq)+NO(g) (HNO3). c)C2H5OH(l)+3O2(g)-->2CO2(g)+3H2O(g) (H..
An electron in the n = 7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 397nm. What is the value of n for the level to which the electron relaxed?
What characteristic H NMR absorptions would be expected in the aliphatic region for 9-hydroxyfluorene
What is the heat change of a 25 g block of iron that starts at a temperature of 22 degrees C and increases to 79 degrees C?
what concentration of NH4+ must be present in a 0.20M aqueous ammonia solution to prevent the percipitation of Mg(OH)2 if the ammonia solution
What is the molality of a solution formed by dissolving 1.70 mol of KCl in 15.0 mol of water (MM of water = 18.02 g/mol),
If 1.500 g of a solute having a molar mass of 125.0 g were dissolved in 35.00g of camphor, what would be the resulting freezing point of the solution.
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