Chemistry concepts and calculations

A 30.-g sample of impure KClO 3 (solubility = 7.1 g per 100 g H 2 O at 20°C) isc

A 30.-g sample of impure KClO3(solubility = 7.1 g per 100 g H2O at 20°C) iscontaminated with 18 percent of KCl(solubility = 25.5 g per 100 g of H2O at 20°C).Calculate the minimum …

A 30.0 gram sample of NaOH is dissolved in water, and thesolution is diluted to

A 30.0 gram sample of NaOH is dissolved in water, and thesolution is diluted to give a final volume of 1.50L. The molarityof the final solution is a. 0.500M b. 0.750M c. 1.00M d. …

A 30.00-mL sample of a weak acid is titrated with 0.0167 M NaOH. At the endpoint

A 30.00-mL sample of a weak acid is titrated with 0.0167 M NaOH. At the endpoint, it is found that 40.35 mL of titrant was used. What was the concentration of the weak acid?

A 300.0 mL buffer solution is 0.260 M in acetic acid and 0.260 M in sodium aceta

A 300.0 mL buffer solution is 0.260 M in acetic acid and 0.260 M in sodium acetate. A) What is the initial pH of this solution? B) What is the pH after addition of 0.0150 mol of H…

A 300.0 mL volume of a 0.10 M stock solution of Cu+2 is to be prepared using CuS

A 300.0 mL volume of a 0.10 M stock solution of Cu+2 is to be prepared using CuSO4. 5H2O (molar mass = 249.68 g/mol). (a) How many grams of CuSO4. 5H2O must be measured for the pr…

A 300M solution of NaCl has a density of 1.07 g/mL what is the molality of the s

A 300M solution of NaCl has a density of 1.07 g/mL what is the molality of the solution? Molality: ____________ Indicate the type of solute-solvent interactions operating in each …

A 30wt% solution of sodium carbonate (Na 2 CO 3 ) is fed to an evaporator/crysta

A 30wt% solution of sodium carbonate (Na2CO3) is fed to an evaporator/crystallizer system with a mass flow rate of 10,000 lb/hr, as shown below. The feed solution is mixed with re…

A 31 year old man became feverish 4 days after arriving at a vacation resort in

A 31 year old man became feverish 4 days after arriving at a vacation resort in Idaho. During his stay he ate at two restaurants that were not associated with the resort. AT the r…

A 315.0 g bar of titanium, initially at 21.0 degree C, is placed outside on a su

A 315.0 g bar of titanium, initially at 21.0 degree C, is placed outside on a sunny day. After sitting in the sun for some time, the temperature of the titanium bar reaches 46.2 d…

A 32 yr old woman was admitted to the hospital following 2 1/2 days of severe vo

A 32 yr old woman was admitted to the hospital following 2 1/2 days of severe vomiting. Before this episode, she was repeatedly well. Physical findings revealed decreased skin tur…

A 32.7mL sample of HCl of an unknown concentration wasdiluted to 100mL. A 20.0mL

A 32.7mL sample of HCl of an unknown concentration wasdiluted to 100mL. A 20.0mL sample of the diluted solution wastitrated against 0.879M solution of Ba(OH)2. Thetitration requir…

A 320 turn solenoid with a length of 19.0 cm and a radius of 1.20 cm carries a c

A 320 turn solenoid with a length of 19.0 cm and a radius of 1.20 cm carries a current of 1.90 A. A second coil of four turns is wrapped tightly around this solenoid, so it can be…

A 33.62 g sample of metal is heated to 98.6°C in a hot water bath until thermal

A 33.62 g sample of metal is heated to 98.6°C in a hot water bath until thermal equilibrium is reached. The metal is quickly transferred to 50.0 mL (50.0 g) of water at 22.2°C con…

A 333-g glider slides down an air track as shown in figure 1 on the lab manual.

A 333-g glider slides down an air track as shown in figure 1 on the lab manual. How fast is it going after it has lost a height of 0.600 m? 1. 2. What is the difference between en…

A 34% Fri 11:53 PM Khaleed Alston a E Chrome File Edit View History Bookmarks Pe

A 34% Fri 11:53 PM Khaleed Alston a E Chrome File Edit View History Bookmarks People Window Help Khaleed LaGuardia Community C X www.saplinglearning.co x www.saplinglearning.co X …

A 34% Fri 11:53 PM Khaleed Alston a E Chrome File Edit View History Bookmarks Pe

A 34% Fri 11:53 PM Khaleed Alston a E Chrome File Edit View History Bookmarks People Window Help Khaleed www.saplinglearning.co x M- www.saplinglearning.co x M1 Inbox khaleed.alst…

A 34% Fri 11:53 PM Khaleed Alston a E Chrome File Edit View History Bookmarks Pe

A 34% Fri 11:53 PM Khaleed Alston a E Chrome File Edit View History Bookmarks People Window Help Khaleed www.saplinglearning.co x M- www.saplinglearning.co x M Inbox khaleed.alsto…

A 34% Fri 53 PM Khaleed Alston a E Chrome File Edit View History Bookmarks Peopl

A 34% Fri 53 PM Khaleed Alston a E Chrome File Edit View History Bookmarks People Window Help Khaleed www.saplinglearning.co x M- www.saplinglearning.co X M1 Inbox khaleed.alstone…

A 35.00-mL sample contains 1.30 g of KHC_8H_4O_4, known as KHP. This sample is u

A 35.00-mL sample contains 1.30 g of KHC_8H_4O_4, known as KHP. This sample is used to standardize an NaOH solution. At the equivalence point. 50.00 mL of NaOH have been added. K_…

A 35.00g sample of sulfar dioxide gas at 21.5 oC has a pressure of 0.977 atm a)

A 35.00g sample of sulfar dioxide gas at 21.5 oC has a pressure of 0.977 atm a) what is the volume of the sample? b)Identify which of the following changes in temperature would re…

A 35.6 g sample of ethanol (C_2H_5OH) is burned in a bomb calorimeter, according

A 35.6 g sample of ethanol (C_2H_5OH) is burned in a bomb calorimeter, according to the following reaction. If the temperature rose from 35.0 to 76.0 degree C and the heat capacit…

A 36% efficient coal fired power plant is producing 790 MW of electricity. The c

A 36% efficient coal fired power plant is producing 790 MW of electricity. The coal has a heating value of 19,000 kJ/kg, an ash content of 7.1% and a sulfur content of 5.2%. Note:…

A 37.7mL volume of an unknown gas is collected over water at19°C and a total pre

A 37.7mL volume of an unknown gas is collected over water at19°C and a total pressure of 770torr. The mass of the gas is68.6mg? (a)What is the pressure of the "dry" unknown gas? (…

A 38.2 mL sample of a 0.438 M aqueous hypochlorous acid solution is titrated wit

A 38.2 mL sample of a 0.438 M aqueous hypochlorous acid solution is titrated with a 0.346 M aqueous potassium hydroxide solution. What is the pH after 26.6 mL of base have been ad…

A 38.6 uF capacitor is connected to a 46.2 ohm resistor and a generator whose rm

A 38.6 uF capacitor is connected to a 46.2 ohm resistor and a generator whose rms output is 23.5 V at 60.0 Hz. Calculate the rms current in the circuit. Calculate the voltage drop…

A 38.91 L sample of a qas at 165.7 K and exactly one atm compressed to 12.7 L an

A 38.91 L sample of a qas at 165.7 K and exactly one atm compressed to 12.7 L and Its temperature changed to 304.3 K. What is the final pressure (in atm)? Report your answer to tw…

A 39 g slug of silver (specific heat capacity = J/Cg) isheated to 92.1 C and pla

A 39 g slug of silver (specific heat capacity = J/Cg) isheated to 92.1 C and placed in water cooled to 20.0 C (spacificheat4.18 J/cg) if the final temp of the water and silver slu…

A 39.44-mL aliquot of 0.0960 M NaOH was added to a 0.3480-g sample of crushed as

A 39.44-mL aliquot of 0.0960 M NaOH was added to a 0.3480-g sample of crushed aspirin tablet dissolved in ethanol. The acetylsalicylic acid in the aspirin tablet was neutralized b…

A 4-km high mountain range is in isostatic equilibrium. Assuming an average thic

A 4-km high mountain range is in isostatic equilibrium. Assuming an average thickness of 35 km for the continental crust, calculate the following. During a period of erosion, a 2 …

A 4.00 gram sample of aluminum metal is added to a solution containing 5.00 g of

A 4.00 gram sample of aluminum metal is added to a solution containing 5.00 g of the dissolved iron chloride. The reaction results in the formation of aluminum chloride and metall…

A 4.00*10^2 mL solution is 0.25 M in ethylamine (CH3CH2)NH2 and 0.40 M in ethyl

A 4.00*10^2 mL solution is 0.25 M in ethylamine (CH3CH2)NH2 and 0.40 M in ethyl ammonium chlorate (CH3CH)NH3ClO3 a) what is the pH of solution b) what is the pH of the solution af…

A 4.06 g gas sample of ethene (C2H4, FW=28.1g/mol) and propene (C3H6, FW=42.1g/m

A 4.06 g gas sample of ethene (C2H4, FW=28.1g/mol) and propene (C3H6, FW=42.1g/mol) was reacted with excess ozone (O3, FW=48g/mol) to produce 3.4g of formaldehyde (CH2O, FW=30 g/m…

A 4.2 mol sample of Kr has a volume of 953 mL. How many moles of Kr are in a 4.9

A 4.2 mol sample of Kr has a volume of 953 mL. How many moles of Kr are in a 4.90 L sample at the same temperature and pressure? _______mol A flexible container at an initial volu…

A 4.25-µF capacitor that is initially uncharged is connected in series with a 7.

A 4.25-µF capacitor that is initially uncharged is connected in series with a 7.20-k? resistor and an emf source with e m f = 115 V and negligible internal resistance. A 4.25-F ca…

A 4.28 gram sample of a gas occupies 800 mL at STP. What is its molecular weight

A 4.28 gram sample of a gas occupies 800 mL at STP. What is its molecular weight? a. 60.0 g/mol b. 153.0 g/mol c. 76.5 g/mol d. 120.0 g/mol e. 140.0 g/mol A sample of hydrogen col…

A 4.400 g sample of propane (C 3 H 8 ), as gas used in portable gas cookers, was

A 4.400 g sample of propane (C3H8), as gas used in portable gas cookers, was placed in a calorimeter where it was burned in the presence of excess oxygen, O2. C3H8(g) + 5 O2(g) ? …

A 4.43 g sample of 2-methoxy-2-methylpropane (formula C 5 H 12 O), is mixed with

A 4.43 g sample of 2-methoxy-2-methylpropane (formula C5H12O), is mixed with 119.19 atm of O2 in a 1.64×10-1 L combustion chamber at 327.9 °C. The combustion reaction to CO2 and H…

A 4.43 g sample of 2-methoxy-2-methylpropane (formula C 5 H 12 O), is mixed with

A 4.43 g sample of 2-methoxy-2-methylpropane (formula C5H12O), is mixed with 119.19 atm of O2 in a 1.64×10-1 L combustion chamber at 327.9 °C. The combustion reaction to CO2 and H…

A 4.476 g sample of a petroleumproduct was burnt in a tubefurnace, and the SO 2

A 4.476 g sample of a petroleumproduct was burnt in a tubefurnace, and the SO2 produced was collected in 3%H2O2. Reaction: SO2 (g) +H2O2--> H2SO4. A 25.00 mL portion of 0.00923…

A 4.5 kg piece of metal alloy requires 183 kilojoules of energy to raise it from

A 4.5 kg piece of metal alloy requires 183 kilojoules of energy to raise it from 27 to 92 degrees centigrade at a constant pressure of 1 atmosphere. What is the constant-pressure …

A 4.55 g sample of water is introduced into a 5.27 L flask containing some C_4 H

A 4.55 g sample of water is introduced into a 5.27 L flask containing some C_4 H_10 gas. The flask is heated to 356.49 degree C at which temperature all of the water is converted …

A 4.626-grain sample of a hydrocarbon, upon combustion in a combustion analysis

A 4.626-grain sample of a hydrocarbon, upon combustion in a combustion analysis apparatus, yielded 6.527 grams of water. The percent, by weight, of hydrogen in the hydrocarbon is,…

A 4.82g sample of iron is heated to 84.3 degrees celsius. A 1.25g sample of gold

A 4.82g sample of iron is heated to 84.3 degrees celsius. A 1.25g sample of gold is heated to 95.1 degrees celsius. Both of these metals are added to 9.47g of cold water that is i…

A 4.850 g sample containing KCl and KClO 4 was dissolved in sufficient water to

A 4.850 g sample containing KCl and KClO4 was dissolved in sufficient water to give 250.00 mL of solution. A 50.00 mL portion of the solution required 42.75 mL of 0.0750 M AgNO3 i…

A 4.965-g soil sample was dissolved to give 0.500 L of solution. A 100.0-mL aliq

A 4.965-g soil sample was dissolved to give 0.500 L of solution. A 100.0-mL aliquot was acidified and excess sodium tetraphenylborate (NaB(C6H5)4) was added to precipitate both K …

A 4.98 g sample of aniline (C_6H_5NH_2) was combusted in a bomb calorimeter with

A 4.98 g sample of aniline (C_6H_5NH_2) was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/degree C. If the temperature rose from 29.5 degree C to 69.8 degree C, …

A 40 kg child is standing at the edge of a rotation merry-go-round. The merry-go

A 40 kg child is standing at the edge of a rotation merry-go-round. The merry-go-round has a rotational speed of 10 rpm and has a diameter of 4 meters. Determine the centripetal a…

A 40-foot \"fiberglass\" boat hull weighs 2000 kg. Sixty percent of that is a fu

A 40-foot "fiberglass" boat hull weighs 2000 kg. Sixty percent of that is a fully cured crosslinked polyester resin (the remainder is the glass reinforcing fibers, pigment, filler…

A 40.0 mL sample of a 0.30 M solution of NH3 is titrated with a 0.50 M HCl solut

A 40.0 mL sample of a 0.30 M solution of NH3 is titrated with a 0.50 M HCl solution. Calculate the pH of the solution when the following percentages of the HCl solution required t…

A 40.0% C_6H_12O_6(aq) has a density of 1.15 g/mL at 18 degree C a. What is the

A 40.0% C_6H_12O_6(aq) has a density of 1.15 g/mL at 18 degree C a. What is the molarity of the solution? b. What is the molality of the solution? c. What is the mole fraction of …