Chemistry concepts and calculations

a) A 0.90 muL sample of an equal volume mixture of 2-pentanone and 1-nitropropan

a) A 0.90 muL sample of an equal volume mixture of 2-pentanone and 1-nitropropane is injected into a gas chromatograph. The densities of these compounds are 0.8124 g/mL for 2-pent…

a) A 1.00 ??sample of an equal volume mixture of 2-pentanone and 1-nitropropane

a) A 1.00 ??sample of an equal volume mixture of 2-pentanone and 1-nitropropane is injected into a gas chromatograph. The densities of these compounds are 0.8124 g/mL for 2-pentan…

a) A 1.500 L flask is filled with a mixture of 1.20 g H2 and 8.40 g O2, at 25°C.

a) A 1.500 L flask is filled with a mixture of 1.20 g H2 and 8.40 g O2, at 25°C. The mixture is ignited, and hydrogen and oxygen combine to form water. What is the total pressure …

a) A 105 g slab of metal is dropped into a cylinder which has 69.9 mL of water i

a) A 105 g slab of metal is dropped into a cylinder which has 69.9 mL of water in it. The water goes up to 83.3 mL with the metal slab in it. What is the density and identity of t…

a) A 105 g slab of metal is dropped into a cylinder which has 69.9 mL of water i

a) A 105 g slab of metal is dropped into a cylinder which has 69.9 mL of water in it. The water goes up to 83.3 mL with the metal slab in it. What is the density and identity of t…

a) A 12 V lead-acid car battery, engineered for \'up to 500 or more charge/disch

a) A 12 V lead-acid car battery, engineered for 'up to 500 or more charge/discharge cycles', has a rating of 135.0 A hr. (It sells for $144.00.) Calculate the total amount of char…

a) A 60.00 g piece of zinc, initially at 400.degree C, is dropped into 255 g of

a) A 60.00 g piece of zinc, initially at 400.degree C, is dropped into 255 g of ice at-10.degree C. Calculate the final temperature of the system and identify the phases of water …

a) A balloon is filled with 1000 liters of a gas on the ground at 1.000 bar pres

a) A balloon is filled with 1000 liters of a gas on the ground at 1.000 bar pressure and 25.6 oC temperature. What is the number of moles of gas in the balloon? ( R= 0.08206 L.atm…

a) A burette which contains 0.001 moles of Mg metal and HCl solution, was invert

a) A burette which contains 0.001 moles of Mg metal and HCl solution, was inverted in water bath of 300 kelvin. The reaction produces 0.025 L of hydrogen gas with a total pressure…

a) A circular ring (2.9 cm OD) is used to determine the surface tension of a liq

a) A circular ring (2.9 cm OD) is used to determine the surface tension of a liquid. The plane of the ring is positioned so that it is parallel to the surface of the liquid. The r…

a) A first order irreversible reaction A rightarrow B is carried out in a series

a) A first order irreversible reaction A rightarrow B is carried out in a series of a number (N) of equal volume Continuous Stirred Tank Reactors (CSTRs) whose total volume is V_R…

a) A gas mixture consists of 2.47 atm of SO 2 Cl 2 , 0.41 atm of SO 2 , and 0.41

a) A gas mixture consists of 2.47 atm of SO2Cl2, 0.41 atm of SO2, and 0.416 atm of Cl2. Calculate the reaction quotient for this system prior to the establishment of the equilibri…

a) A graduated cylinder with 18 ml of water will contain18gm of water, which equ

a) A graduated cylinder with 18 ml of water will contain18gm of water, which equals one mole of water molecules. If each ofthese water molecules were enlarged to the the size of a…

a) A light string is attatched to a heavy rope, and the whole thing is pulled ti

a) A light string is attatched to a heavy rope, and the whole thing is pulled tight.   A wave is sent along the light string.   When it hits the heavy rope, compared to the wave o…

a) A nonsense suppressor su1 in the E. coli genome acts on mutation 1 and 2 of g

a)A nonsense suppressor su1 in the E. coli genome acts on mutation 1 and 2 of gene P in the T4 bacteriophage genome, but not on mutation 3. A different nonsense suppressor su2 wor…

a) A sample of argon occupies 100L at standard temperature. Assuming constant pr

a) A sample of argon occupies 100L at standard temperature. Assuming constant pressure, what volume will the gas A) 50L occupy if the temperature is halved? B) 100L C) 200L D) 300…

a) A sample of carbon dioxide gas collected at a pressure of 1.22 atm and a temp

a) A sample of carbon dioxide gas collected at a pressure of 1.22 atm and a temperature of 9.00 °C is found to occupy a volume of 29.2 liters. How many moles of CO2 gas are in the…

a) A sample of tris(hyroxymethyl)aminomethane (H2NC(CH2OH)3), which is a base, w

a) A sample of tris(hyroxymethyl)aminomethane (H2NC(CH2OH)3), which is a base, with a mass of 0.6247 g is dissolved in water and used to standardize a solution of hydroiodic acid.…

a) A solution is composed of 1.10 m o l cyclohexane ( P ? c y = 97.6 t o r r ) a

a)  A solution is composed of 1.10mol  cyclohexane (P?cy=97.6 torr) and 2.60mol  acetone (P?ac=229.5 torr). What is the total vapor pressure Ptotal above this solution? Express yo…

a) A student A weighed .50 Ca(OH)2 for his saturated solution and student B weig

a) A student A weighed .50 Ca(OH)2 for his saturated solution and student B weighed 0.23 g, Both students dissolved it in 60 ml of water and both had solid left in their solution …

a) A system does work on the surroundings equal to 64 J and the change in energy

a) A system does work on the surroundings equal to 64 J and the change in energy is -213 J. Calculate the heat  J b) If 6.40 kJ of heat is needed to raise the temperature of a sam…

a) A vapor mixture of 0.200 moles of methanol(1) and 0.300 moles of ethanol(2) i

a) A vapor mixture of 0.200 moles of methanol(1) and 0.300 moles of ethanol(2) is compressed at 20 oC. Calculate the pressure at which the first liquid forms and the mole fraction…

a) A vapor mixture of 0.200 moles of methanol(1) and 0.300 moles of ethanol(2) i

a) A vapor mixture of 0.200 moles of methanol(1) and 0.300 moles of ethanol(2) is compressed at 20 oC. Calculate the pressure at which the first liquid forms and the mole fraction…

a) Although animals cannot synthesize glucose from acetyl-CoA, if a rat is fed^1

a) Although animals cannot synthesize glucose from acetyl-CoA, if a rat is fed^14 C-labeled acetate (which can be converted to acetyl CoA by acetyl CoA synthetase), some of the la…

a) Ammonia, NH 3 , is a base that ionizes to give NH 4 + and OH - (K b = 1.8E-5)

a) Ammonia, NH3, is a base that ionizes to give NH4+ and OH- (Kb = 1.8E-5). You add magnesium sulfate to an ammonia solution. Calculate the concentration of Mg2+ ion when magnesiu…

a) An acetic acid/sodium acetate buffer is made that is 0.42 M in HAc and 0.42 M

a) An acetic acid/sodium acetate buffer is made that is 0.42 M in HAc and 0.42 M in NaAc. Calculate the pH after 0.024 mol of HCl is added to 1.0 L of the buffer. (Assume no volum…

a) An aqueous solution containing 10 g of optically pure fructose was diluted to

a) An aqueous solution containing 10 g of optically pure fructose was diluted to 500 mL with water and placed in a polarimeter tube 20 cm long. The measured rotation was -5.20 deg…

a) An aqueous solution of sodium fluoride is slowly added to a water sample that

a) An aqueous solution of sodium fluoride is slowly added to a water sample that contains barium ion (0.0405M) and calcium ion(0.0735M). The Ksp of barium fluoride is 1.0x10^-6. T…

a) An electron in a Hydrogen atom moves around in a circular orbit of radius 0.5

a) An electron in a Hydrogen atom moves around in a circular orbit of radius 0.51 x um Suppose the hydrogen at s ran Porte into a ma ne i T, where the magnetic field is parallel t…

a) An ice cream recipe calls for 2 cups (400 g) sugar (sucrose, C12H22O11) to sw

a) An ice cream recipe calls for 2 cups (400 g) sugar (sucrose, C12H22O11) to sweeten 1.8 L of whole milk The density of milk is 1.04 g/mL. Assuming all other ingredients do not c…

a) An ideal gaseous reaction (which is a hypothetical gaseous reaction that conf

a) An ideal gaseous reaction (which is a hypothetical gaseous reaction that conforms to the laws governing gas behavior) occurs at a constant pressure of 40.0 atm and releases 55.…

a) An iron sulfide contains 36.5% S by mass. The iron sulfide is heated in an at

a) An iron sulfide contains 36.5% S by mass. The iron sulfide is heated in an atmosphere of pure oxygen, which produces SO2(g) and an iron oxide containing 27.6% O by mass. Write …

a) Assume a directory contains a large number of files of the form ts Rax.xxdxRe

a) Assume a directory contains a large number of files of the form ts Rax.xxdxRex.xdx.stdy, where x represents a digit 0 9. – Write a command line to convert the filenames to ts R…

a) Assume that algae need carbon, nitrogen and phosphorous in the ratios 106:16:

a) Assume that algae need carbon, nitrogen and phosphorous in the ratios 106:16:1. What is the limiting nutrient in a lake that contains the following concentrations: total C = 21…

a) Assume that the H o and S o of vaporization do not change significantly with

a) Assume that the Ho and So of vaporization do not change significantly with temperature. Calculate the vapor pressure of CH3OH at 50 oC (in atm). CH3OH (l) CH3OH(g) . . . Ho = 3…

a) At 800 K the equilibrium constant for I2(g) 2 I(g) is Kc = 3.1 10-5. If an eq

a) At 800 K the equilibrium constant for I2(g) 2 I(g) is Kc = 3.1 10-5. If an equilibrium mixture in a 10.0-L vessel contains 2.51 10-2 g of I(g), how many grams of I2 are in the …

a) At high temperature, ammonia reduces copper(II) oxide to the free metal: Step

a) At high temperature, ammonia reduces copper(II) oxide to the free metal: Step 1: 2NH3(g) + 6CuO(s) => N2(g) + 3Cu2O(s) + 3H2O(g) Step 2: 2NH3(g) + 3Cu2O(s) => N2(g) + 6Cu…

a) At physiological temperature (37 o C) the osmotic pressure of blood is 7.65 a

a) At physiological temperature (37oC) the osmotic pressure of blood is 7.65 atm. If you are preparing a dextrose solution for injection, how many milligrams of dextrose (180 g/mo…

a) BURET BEFORE TITRATION : Above is a buret with NaOH solution before the titra

a) BURET BEFORE TITRATION: Above is a buret with NaOH solution before the titration begins. Read the volume to the nearest hundredth of a mL. Tolerance is set absolute to +/- 0.02…

a) BaI2(aq) b) NiSO4(aq) c) LiF(aq) Solution (a) In the molten form of barium io

a) BaI2(aq) b) NiSO4(aq) c) LiF(aq)

a) Balance the following equation (10 marks) b) Balance the following equation (

a) Balance the following equation (10 marks) b) Balance the following equation (10 marks) C,H2Cla + Ca(OH)2 C2HCla + CaCl2+ H2O In answering a) and b) set up the corresponding sys…

a) Balance the following equation. NaBH4 +I2 ->. B2H6+ NaI+ H2 b) Calculate the

a) Balance the following equation. NaBH4 +I2 ->. B2H6+ NaI+ H2 b) Calculate the theoretical mass of B2H6 possible from the reaction of 10.5 g of NaBH4. c) Suppose the reaction …

a) Briefly discuss the difference between \"plug flow\" and \"perfect mixing\" a

a) Briefly discuss the difference between "plug flow" and "perfect mixing" and give examples of reactors which most closely fit these models. b) For a perfect mixer, the particle …

a) C 5 H 12 ( l ) + O 2 ( g ) CO 2 ( g ) + H 2 O( l ) If 28.6 grams of pentane (

a) C5H12(l) + O2(g) CO2(g) + H2O(l) If 28.6 grams of pentane (C5H12) are burned in excess oxygen, how many grams of H2O will be produced? ____________g H2O b) If baking soda (sodi…

a) C 60 fullerenes crystallizes into an fcc lattice, also known as fullerite, wi

a) C60 fullerenes crystallizes into an fcc lattice, also known as fullerite, with a lattice constant of a=14.17 Å. The diameter of a C60 molecule is about 0.71 nm. Calculate the d…

a) CH(CH3)2NH2 is an example of a secondary amine. b) Bromine has 35 valence ele

a) CH(CH3)2NH2 is an example of a secondary amine. b) Bromine has 35 valence electrons. c) Kerosene distills at a higher temperature than gasoline. d) All molecules with polar bon…

a) Calculate Hº (in kJ) for the following reaction at 298 K: 2CO 2 (g) +4H 2 O(l

a) Calculate Hº (in kJ) for the following reaction at 298 K: 2CO2(g) +4H2O(l) 2CH3OH(l) + 3O2(g) Use the data in Appendix II (Tro); Appendix 4 (Zumdahl) b) Calculate Sº (in J/K) a…

a) Calculate how much methanol will be needed in the experiment if exactly 50.00

a) Calculate how much methanol will be needed in the experiment if exactly 50.00 g vegetable oil is measured. (The molar ratio of methanol:oil is 10:1 and the molar mass of the ve…

a) Calculate the boiling point (in degrees C) of a solution made by dissolving 5

a) Calculate the boiling point (in degrees C) of a solution made by dissolving 5.78 g of fructose (C6H12O6) in 12 g of water. The Kbp of the solvent is 0.512 K/m and the normal bo…

a) Calculate the change in entropy (deltaS) when one mole of diamond is heated f

a) Calculate the change in entropy (deltaS) when one mole of diamond is heated from a temperature of 0 K to 400 K at a constant pressure of 1 bar. The temperature-dependent heat c…