Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains...
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0012 % Pb by mass. What volume of the water in milliliters contains 155 mg of Pb? (Assume that the density of the solution is 1.0 g/mL.) Express your answer using two significant figures.
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Lead is a toxic metal that affects the central nervous system. A
Pb-contaminated water sample contains...
1. Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of...
1. Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 112 kJof heat? 2. Calculate the mass of nitrogen dissolved at room temperature in an 97.0 Lhome aquarium. Assume a total pressure of 1.0 atmand a mole fraction for nitrogen of 0.78. 3. Use Henry's law to determine the molar solubility of helium at a pressure of 2.0 atmand 25 ∘C....
Please I need help with number 54 and 61 please An aqueous NaCl solution is made...
Please I need help with number 54 and 61 please
An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate the molarity, molality, and mass percent of the solution. (Assume a density of 1 08 g/mL for the solution.) An aqueous KNO_3 solution is made using 72.5 g of KNO_3 diluted to a total solution volume of 2.00 L. Calculate the molarity, molality, and mass percent of the solution....
Lead is an element that we humans are exposed to through food, drinking water and the...
Lead is an element that we humans are exposed to through food, drinking water and the environment. It is toxic to humans as it affects the central nervous system. Some symptoms that are experienced are lethargy and loss of motor coordination. A chelating agent is a compound that can form a very stable complex with a metal cation. One of these agents is dimethyl mercapto succinate acid (DMSA) which forms a stable complex with lead. The use of this compound...
7. The lead level in a sample of contaminated soil was determined using atomic absorption spectrometry....
7. The lead level in a sample of contaminated soil was determined using atomic absorption spectrometry. A 2.0 g sample was dissolved in acid and then diluted to a total volume of 50.0 mL. The absorbance of this solution, determined in a spectrometer set at a wavelength of 218 nm, was found to be 0.20. Several standard solutions of lead were tested under the same conditions and the calibration curve shown below was generated. The concentration of lead in the...
A graduated cylinder contains 16.5 mL of water. What is the new water level after 39.4...
A graduated cylinder contains 16.5 mL of water. What is the new water level after 39.4 g of silver metal with a density of 10,5 g/mL is submerged in the water? Express your answer using three significant figures. Part B A thermometer containing 7.4 g of mercury has broken. If mercury has a density of 13.6 g/mL, what volume spilled? Express your answer using two significant figures.
Your test your tap water and find that it contains 45 mg of lead in 1750...
Your test your tap water and find that it contains 45 mg of lead in 1750 mL of solution. Represent this concentration in a.) ppm (mg/L) b.) ppb (ug/L) Include 3 significant figures and units in your answers
A 1.04 g sample of KBr is dissolved in water to give 155 mL of solution....
A 1.04 g sample of KBr is dissolved in water to give 155 mL of solution. This solution is then added to 165 mL of 0.015 M aqueous Pb(NO3)2, in an attempt to remove the toxic lead(II) ions from the solution via precipitation as insoluble PbBr2(s). The precipitation reaction that occurs is: PB2+(aq) + 2Br(aq) --> PbBr2(s) What is the maximum mass of product that could be isolated by filtration after the reaction occurs?
When 25 g of the unknown metal were added, the water was displaced 3.50 mL. Calculate...
When 25 g of the unknown metal were added, the water was displaced 3.50 mL. Calculate the density of the unknown metal. Remember, density = mass/volume. Express your answer as g/cm3 ( 1 mL = 1 cm3). Choose the closest answer. How many significant figures should be shown in the final answer?
A 1435 mL sample of drinking water was found to contain 67.0 mg of lead. Calculate...
A 1435 mL sample of drinking water was found to contain 67.0 mg of lead. Calculate the concentration of lead in milligrams per liter. lead concentration: m g/L Calculate the percent mass per volume, % (m/v), of a dextrose solution containing 8.00 g of dextrose in 2.00 x 10 mL of solution. Note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v). percent mass per volume concentration: %...
ID Problems 46) A piece of silver (Ag) metal weighing 194.3 g is placed in a...
ID Problems 46) A piece of silver (Ag) metal weighing 194.3 g is placed in a graduated cylinder containing 242.0 mL of water. The volume of water now reads 260.5 mL. From these data calculate the density of silver 47) The following procedure was used to determine the volume of a flask. The flask was weighed dry and then filled with water. If the masses of the empty flask and filled flask were 56.12 g and 87.39 g, respectively, and...
Please I need help with number 54 and 61 please
An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate the molarity, molality, and mass percent of the solution. (Assume a density of 1 08 g/mL for the solution.) An aqueous KNO_3 solution is made using 72.5 g of KNO_3 diluted to a total solution volume of 2.00 L. Calculate the molarity, molality, and mass percent of the solution....
7. The lead level in a sample of contaminated soil was determined using atomic absorption spectrometry. A 2.0 g sample was dissolved in acid and then diluted to a total volume of 50.0 mL. The absorbance of this solution, determined in a spectrometer set at a wavelength of 218 nm, was found to be 0.20. Several standard solutions of lead were tested under the same conditions and the calibration curve shown below was generated. The concentration of lead in the...
A graduated cylinder contains 16.5 mL of water. What is the new water level after 39.4 g of silver metal with a density of 10,5 g/mL is submerged in the water? Express your answer using three significant figures. Part B A thermometer containing 7.4 g of mercury has broken. If mercury has a density of 13.6 g/mL, what volume spilled? Express your answer using two significant figures.
A 1435 mL sample of drinking water was found to contain 67.0 mg of lead. Calculate the concentration of lead in milligrams per liter. lead concentration: m g/L Calculate the percent mass per volume, % (m/v), of a dextrose solution containing 8.00 g of dextrose in 2.00 x 10 mL of solution. Note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v). percent mass per volume concentration: %...
ID Problems 46) A piece of silver (Ag) metal weighing 194.3 g is placed in a graduated cylinder containing 242.0 mL of water. The volume of water now reads 260.5 mL. From these data calculate the density of silver 47) The following procedure was used to determine the volume of a flask. The flask was weighed dry and then filled with water. If the masses of the empty flask and filled flask were 56.12 g and 87.39 g, respectively, and...
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