Open Question
The Henry’s law constant for helium gas in water at 30 °C is 3.7 * 10^-4 M/atm and the constant for N2 at 30 °C is 6.0 * 10^-4 M/atm. If the two gases are each present at 1.5 atm pressure, calculate the solubility of each gas.
Ch.13 - Properties of Solutions
Chapter 13, Problem 39b
(b) An ore contains 2.86 g of silver per ton of ore. What is the concentration of silver in ppm?
Verified step by step guidance1
Understand that ppm (parts per million) is a way of expressing very dilute concentrations of substances. It is equivalent to milligrams of solute per kilogram of solution.
Convert the mass of silver from grams to milligrams. Since 1 gram is equal to 1000 milligrams, multiply 2.86 grams by 1000 to get the mass in milligrams.
Recognize that 1 ton of ore is equivalent to 1,000,000 grams. This is because 1 ton is equal to 2000 pounds, and 1 pound is approximately 453.592 grams.
Calculate the concentration of silver in ppm by dividing the mass of silver in milligrams by the mass of the ore in grams, and then multiplying the result by 1,000,000 to convert to ppm.
Express the final concentration of silver in ppm, ensuring that the units are consistent and the calculation reflects the definition of ppm.
Related Practice
Open Question
The partial pressure of O2 in air at sea level is 0.21 atm. Using the data in Table 13.1, together with Henry’s law, calculate the molar concentration of O2 in the surface water of a mountain lake saturated with air at 20 °C and an atmospheric pressure of 650 torr.
Textbook Question
(a) Calculate the mass percentage of Na2SO4 in a solution containing 10.6 g of Na2SO4 in 483 g of water.
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Open Question
A solution is made containing 14.6 g of CH3OH in 184 g of H2O. Calculate (a) the mole fraction of CH3OH.
Textbook Question
A solution is made containing 20.8 g of phenol (C6H5OH) in 425 g of ethanol (CH3CH2OH). Calculate (a) the mole fraction of phenol,
Textbook Question
A solution is made containing 20.8 g of phenol (C6H5OH) in 425 g of ethanol (CH3CH2OH). Calculate (c) the molality of phenol.
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