In the US, alcohol proof is equal to twice the percent of alcohol (ethanol) by volume, so for example, 190 proof alcohol is a 95% ethanol solution by volume. What is the proof of a 750-mL bottle of rum that contains 4.73 moles of ethanol, C2H5OH, which has a density of 0.785 g/mL?  ______proof

The minimum level of mercury levels in water considered safe is 1 part per billion (ppb) by weight. Ifyou did an analysis and found that the concentration was 0.59 parts per billion. What quantity of mercuryin grams was present in 8.52 L of the water, the density of which is 0.998 g/ml? (1 ppb Hg = 1 ng Hg per1 g water)

What mass ( in g ) of NaCl is needed to make 530 g of a 21.1% NaCl solution? Report your answer to 2 decimal places.

Fill in the blanks - all the statements refer to bowls A-F shown in the figure below. 2. Solutions in bowls Solutions in bowls Solutions in bowls Bags in bowls Bags in bowls Bags in bowls are hypertonic. are hypotonic. are isotonic. lose mass. gain mass. neither gain, nor lose mass. A B C 5% sugar 9% 5% H₂O sugar sugar H₂O H₂O D E F 5% 2% 3% 7% sugar sugar sugar sugar 1% sugar 1% sugar ©2020 Olga Hogrefe

What mass of cesium bromide must be added to 0.500 L of water d=1.00 to produce a 0.650 m solution? What are the mole fraction and the mass mL percent of CsBr? Be sure each of your answer entries has the correct number of significant figures. Part 1 of 3 Mass of cesium bromide = Part 2 of 3 Mole fraction= Part 3 of 3 Mass percent= % x10 g x10 X x10

1a. Medical saline typically consists of 4.50 g of NaCl in 500.0 mL of solution. What is the molarity of this solution? What is the molality of this solution? (Use the density of water = 1 g/mL; for this question, since the concentration is dilute you may assume that the added NaCl does not result in a change in volume when it is added to water.) Do your answers make sense? Would either of these values potentially depend on temperature? 1b. Stomach acid is essentially a solution of hydrochloric acid (HCl). When first secreted, stomach acid has a concentration of roughly 0.160 M HCl. How many moles of HCl are present in 50.0 mL of stomach acid? 1c. If 5.0 mL of saline is introduced to 15 mL of stomach acid. What is the mole fraction of NaCl? What is the mole fraction of HCl? (In your calculations, use the molarities from parts (a) and (b) above).

Calculate the volume in liters of a 0.099 mol/L barium chlorate solution that contains 75.0 g of barium chlorate (Ba(CIO,)): Round your answer to 2 significant digits. L Ox10

Q2. A 250.0-mL aqueous solution contains 45.1 mg of a pesticide. Express the pesticide's concentration in weight percent, parts per million.

Calculate the volume in milliliters of a 0.529/molL barium acetate solution that contains 100.mmol of barium acetate BaC2H3O22. Be sure your answer has the correct number of significant digits.

A student wants to make a 250 mL stock solution with a concentration of 1000 mg -P/L. The student has an unlimited amount of KH2PO4 and DI water. What mass of KH2PO4 is needed to make 250 mL the 1000 mg -P/L solution?  Using the stock solution from the previous question, what volume of stock is needed to make a 20 L solution with a concentration of 0.1 mg -P/L?