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The amount of caffeine contained in 150 mL of a reasonably strong cup of Starbucks coffee is about 110 mg. What is the concentration of caffeine in the cup of coffee, expressed as a percentage of weight per volume?
A Chemistry 20 student is provided with two sodium carbonate solutions for a laboratory activity. Solution A has a concentration of 3.48 x 103 ppm and Solution B has a concentration of 0.46% W/V. Which solution is more concentrated?
Question- A 20.00-mL NaBr solution is treated with 40.00mL of 0.278 M AgNO3. The precipitate is filtered, washed and the filtrate containing a few drops of Fe3+ is titrated by a 0.230 M KSCN solution. The solution becomes red after 28.67mL of titr..
Copper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 351pm, what is the radius of the copper atom
What is the pH of a solution that is 0.20 M HC2H3O2 and 0.40 M NaC2H3O2? Ka for acetic acid 1.8 x 10-5. Explain
electrolysis of an alkaline earth mtal cloride using a current of 5.00 a for 748 sec. deposits .471g of metal at the
When photons with a wavelength of 310. nm strike a magnesium plate, the maximum velocity of the ejected electrons is 3.45 × 105 m/s.
Problem- A 150 mL sample of an 9.5M NaCl solution is diluted to 3.0L What volume of the diluted solution contains 13.8g of NaCl
Predict the sign of Change in S for this reaction and explain. -Calculate the Change is S from standard molar entropy values. S for Na2O2(s) = 95 J/mol K
If you add 0.35 g NaF to 150 mL of a 0.30 M HF, what is the pH of the resulting solution?
Calculate the molarity of ammonium bromide solution. Use the molarity of the solution to find the mass of ammonium bromide in 1.00 L of this solution.
What highly volatile liquid can cause grave danger to EHS and FS professionals at incident scenes because its vapor is 2.6 times heavier than air, has an extremely low autoignition temperature of 212 degrees Fahrenheit.
the vapor pressure of a liquid at 25c is 200 torr. what will happen when the barometric pressure pbar is lowered to 190
show the calculation for the percent yield of K3[Fe(C2O4)3].3H2O using your actual yield and the theoretical yield
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