Chemistry concepts and calculations

1. A sample of a compound of Cl and O reacts with excess H 2 to give 0.233 g of

1.   A sample of a compound of Cl and O reacts with excess H2 to give 0.233 g of HCl and 0.403 g of H2O. Determine the empirical formula of the compound. 2.   The atomic mass of e…

1. A sample of a gas has a pressure of 854 torr at 288 °C. To what Celsius tempe

1. A sample of a gas has a pressure of 854 torr at 288 °C. To what Celsius temperature must the gas be heated to double its pressure if there is no change in the volume of the gas…

1. A sample of an ideal gas at 1.00 atm and a volume of 1.04 L was placed in a w

1. A sample of an ideal gas at 1.00 atm and a volume of 1.04 L was placed in a weighted balloon and dropped into the ocean. As the sample descended, the water pressure compressed …

1. A sample of an ideal gas has a volume of 2.25 L at 288 K and 1.06 atm. Calcul

1. A sample of an ideal gas has a volume of 2.25 L at 288 K and 1.06 atm. Calculate the pressure when the volume is 1.38 L and the temperature is 3.00 × 102 K. 2. A gas-filled wea…

1. A sample of an ideal gas has a volume of 3.65 L at 14.00 degrees C and 1:30 a

1. A sample of an ideal gas has a volume of 3.65 L at 14.00 degrees C and 1:30 atm. What is the volume of the gas at 21 degrees C and 0.998 atm? Answer has to be in L 2. If 5.45 m…

1. A sample of carbon dioxide gas at 287 K and 0.350 atm occupies a volume of 2.

1. A sample of carbon dioxide gas at 287 K and 0.350 atm occupies a volume of 2.45 L. If the gas is compressed into a smaller volume, while at the same time it is cooled to a lowe…

1. A sample of gaseous krypton is heated with an electrical coil. If 43.2 Joules

1. A sample of gaseous krypton is heated with an electrical coil. If 43.2 Joules of energy are added to a 10.8 gram sample initially at 22.8°C, what is the final temperature of th…

1. A sample of hydrochloric acid is standardized using sodium bicarbonate. a. Wr

1. A sample of hydrochloric acid is standardized using sodium bicarbonate. a. Write the balanced chemical equation for the reaction of hydrochloric acid with sodium bicarbonate, N…

1. A sample of ideal gas at room temperature occupies a volume of 31.0 L at a pr

1. A sample of ideal gas at room temperature occupies a volume of 31.0 L at a pressure of 612 torr . If the pressure changes to 3060 torr , with no change in the temperature or mo…

1. A sample of ideal gas at room temperature occupies a volume of 38.0 L at a pr

1. A sample of ideal gas at room temperature occupies a volume of 38.0 L at a pressure of 512 torr . If the pressure changes to 2560 torr , with no change in the temperature or mo…

1. A sample of liquid water is heated with an electrical coil. If 1030 Joules of

1. A sample of liquid water is heated with an electrical coil. If 1030 Joules of energy are added to a 13.5 gram sample and the final temperature is 38.6°C, what is the initial te…

1. A sample of methane gas has a volume of 38mL at a pressure of 2.2atm. What is

1. A sample of methane gas has a volume of 38mL at a pressure of 2.2atm. What is the volume of the gas (in mL) at 6.1 atm? Assume that there is no change in the temperature and th…

1. A sample of neon gas at a pressure of 0.687 atm and a temperature of 245 ° C,

1. A sample of neon gas at a pressure of 0.687 atm and a temperature of 245 °C, occupies a volume of 530 mL. If the gas is heated at constant pressure until its volume is 655 mL, …

1. A sample of neon gas collected at a pressure of 0.627 atm and a temperature o

1. A sample of neon gas collected at a pressure of 0.627 atm and a temperature of 16.0 °C is found to occupy a volume of 24.5 liters. How many moles of Ne gas are in the sample? _…

1. A sample of potassium hydrogen iodate (KH(IO 3 ) 2 ), which is an acid, with

1. A sample of potassium hydrogen iodate (KH(IO3)2), which is an acid, with a mass of 0.5608 g is dissolved in water and used to standardize a solution of potassium hydroxide. An …

1. A sample of potassium hydrogen iodate (KH(IO 3 ) 2 ), which is an acid, with

1. A sample of potassium hydrogen iodate (KH(IO3)2), which is an acid, with a mass of 0.5608 g is dissolved in water and used to standardize a solution of potassium hydroxide. An …

1. A sample of potassium hydrogen phthalate (KHC 8 H 4 O 4 ), which is an acid,

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.8473 g is dissolved in water and used to standardize a solution of barium hydroxide. An …

1. A sample of potassium hydrogen phthalate (KHC 8 H 4 O 4 ), which is an acid,

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.1728 g is dissolved in water and used to standardize a solution of strontium hydroxide. …

1. A sample of potassium hydrogen phthalate (KHC 8 H 4 O 4 ), which is an acid,

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.4304 g is dissolved in water and used to standardize a solution of potassium hydroxide. …

1. A sample of potassium hydrogen phthalate (KHC 8 H 4 O 4 ), which is an acid,

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.8473 g is dissolved in water and used to standardize a solution of barium hydroxide. An …

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.3995 g is dissolved in water and used to standardize a solution of potassium hydroxide. …

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.3995 g is dissolved in water and used to standardize a solution of potassium hydroxide. …

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.8356 g is dissolved in water and used to standardize a solution of strontium hydroxide. …

1. A sample of potassium hydrogen phthalate (KHCgH404), which is an acid, with a

1. A sample of potassium hydrogen phthalate (KHCgH404), which is an acid, with a mass of 0.3650 g is dissolved in water and used to standardize a solution of potassium hydroxide. …

1. A sample of propane, C3H8 , contains 18.0 moles of carbon atoms. How many tot

1. A sample of propane, C3H8 , contains 18.0 moles of carbon atoms. How many total moles of atoms does the sample contain? Express the total number of moles of carbon and hydrogen…

1. A sample of pure zinc metal weighing 816.0 mg is carefully dissolved in HCl a

1.    A sample of pure zinc metal weighing 816.0 mg is carefully dissolved in HCl and then diluted to exactly 500.00 mL in a volumetric flask.  The titration of the 50-mL aliquot …

1. A sample of radioactive material produces 1.2 millicuries of radiation. The h

1. A sample of radioactive material produces 1.2 millicuries of radiation. The half life of this radioactive nucleus is 6.00 months. How many years will it take for this radioacti…

1. A sample of tris(hyroxymethyl)aminomethane (H 2 NC(CH 2 OH) 3 ), which is a b

1. A sample of tris(hyroxymethyl)aminomethane (H2NC(CH2OH)3), which is a base, with a mass of 0.4886 g is dissolved in water and used to standardize a solution of hydroiodic acid.…

1. A sample of tris(hyroxymethyl)aminomethane (H 2 NC(CH 2 OH) 3 ), which is a b

1. A sample of tris(hyroxymethyl)aminomethane (H2NC(CH2OH)3), which is a base, with a mass of 0.4886 g is dissolved in water and used to standardize a solution of hydroiodic acid.…

1. A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, fo

1. A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 325 mL of a solution …

1. A scuba diver 40 ft below the ocean surface inhales 80.0 mL of compressed air

1. A scuba diver 40 ft below the ocean surface inhales 80.0 mL of compressed air from a scuba tank at a pressure of 2.50 atm and a temperature of 7 C. What is the pressure of the …

1. A seed crystal of diameter D (mm) is placed in a solution of dissolved salt,

1. A seed crystal of diameter D (mm) is placed in a solution of dissolved salt, and new crystals are observed to form at a constant rate r (crystals/min). Experiments with seed cr…

1. A sequence of characters enclosed within double quotation marks is a . a. sym

1. A sequence of characters enclosed within double quotation marks is a . a. symbolic string b. literal string c. prompt d. command 2. To create a String object, you can use the k…

1. A similar experiment was performed in lab and was carried out by your instruc

1. A similar experiment was performed in lab and was carried out by your instructor. THe data was collected and analyzed with the use of Excel. The equation of best fit line was y…

1. A sliver of metal has been extracted from the head of a victim of a crime. Yo

1. A sliver of metal has been extracted from the head of a victim of a crime. You subject it to analysis by ICP and find it contains 95% tin, 2% copper, 2% bismuth, and 1% antimon…

1. A sludge containing 4% solid (by weight) needs to be thickened by centrifugat

1. A sludge containing 4% solid (by weight) needs to be thickened by centrifugation to 15% solid for disposal. The centrifuge has a high constant speed and produces a dewatered sl…

1. A solid mixture consists of 28.9 g of KNO3 (potassium nitrate) and 5.1 g of K

1. A solid mixture consists of 28.9 g of KNO3 (potassium nitrate) and 5.1 g of K2SO4 (potassium sulfate). The mixture is added to 130. g of water. If the solution described in the…

1. A solid mixture consists of 28.9 g of KNO3 (potassium nitrate) and 5.1 g of K

1. A solid mixture consists of 28.9 g of KNO3 (potassium nitrate) and 5.1 g of K2SO4 (potassium sulfate). The mixture is added to 130. g of water. If the solution described in the…

1. A soluble salt, MX 2, is added to water in a beaker. The equation for the dis

1. A soluble salt, MX2,   is added to water in a beaker. The equation for the dissolving of the salt is: A. Immediately after the salt dissolves is the solution warmer or colder? …

1. A solute is a strong electrolyte that ionizes into 4 ions. What is the molar

1. A solute is a strong electrolyte that ionizes into 4 ions. What is the molar mass of this solute if 21.27 grams added to exactly 1 kg of solvent change the boiling point by 0.6…

1. A solution containing 100.0 g of an unknown liquid and 900.0 g of water has a

1. A solution containing 100.0 g of an unknown liquid and 900.0 g of water has a freezing point of -3.33 oC. Given Kf = 1.86 oC/m for water, what is the molecular weight of the un…

1. A solution containing 27.00 mg of an unknown protein per 28.5 mL solution was

1. A solution containing 27.00 mg of an unknown protein per 28.5 mL solution was found to have an osmotic pressure of 3.90 torr at 42 C. What is the molar mass of the protein? Uni…

1. A solution containing the following was prepared: 0.11 M Pb2 , 1.5 *10-6 M Pb

1. A solution containing the following was prepared: 0.11 M Pb2 , 1.5 *10-6 M Pb4 , 1.5 *10-6 M Mn2 , 0.11 M MnO4-, and 0.94 M HNO3. For this solution, the following balanced redu…

1. A solution contains 0.285 M sodium acetate and 8.74×10-2 M acetic acid. The p

1. A solution contains 0.285 M sodium acetate and 8.74×10-2 M acetic acid. The pH of this solution is 2.A solution contains 0.245 M potassium hypochlorite and 0.388 M hypochlorous…

1. A solution contains 11.60g of unknown compound dissolved in 50.0 mL of water.

1. A solution contains 11.60g of unknown compound dissolved in 50.0 mL of water. (Assume a density of 1.00 g/mL for water.) The freezing point of the solution is -4.79?C. The mass…

1. A solution contains 35 parts per thousand (g kg -1 ) NaCl. Calculate the conc

1. A solution contains 35 parts per thousand (g kg-1) NaCl. Calculate the concentration of Na+ abd Cl- in mmol L-1 (assume solution density = 1.026 g mL-1) 2. If 0.1 mole of CaCl2…

1. A solution contains 50.0 g of heptane (C 7 H 16 ) and 50.0 g of octane (C 8 H

1.       A solution contains 50.0 g of heptane (C7H16) and 50.0 g of octane (C8H18) at 250C. The vapor pressures of pure hexane and pure octane at 250C are 45.8 torr and 10.9 torr…

1. A solution is made by dissolving 1.00 g of the ligan bipyridine ( C10 H8 N2)

1. A solution is made by dissolving 1.00 g of the ligan bipyridine ( C10 H8 N2) in enough water to make 1.00 L of solution. Determine the concentration of bipyridine in the follow…

1. A solution is made by dissolving 1.13g of aluminum chloride in enough water t

1. A solution is made by dissolving 1.13g of aluminum chloride in enough water to make 500 mL of solution . What is the molarity of this solution? 2. Consider the following equati…

1. A solution is made by dissolving 3.35 grams of an unknown salt in 150 mL of w

1.       A solution is made by dissolving 3.35 grams of an unknown salt in 150 mL of water (at 22.5 deg. C) , and the temperature of the            water rose to 23.81 deg. C.  Ad…