Tuesday
July 28, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
A flask contains 25.0 mL of diethyl ether weighth 18.74 µg (micrograms). What is the density of the diethyl ether and grams per liter? I'm not sure how to set this problem up correctly.
Friday, May 1, 2015 by Sara

chemistry
What is the root mean square speed of argon gas at 300 K? 1. 4.33 × 102 m/s 2. 1.37 × 101 m/s 3. 3.96 × 102 m/s 4. 4.30 × 101 m/s 5. 5.92 × 102 m/s
Friday, May 1, 2015 by Anonymous

chemistry
Given a percent yield of 45.0% for the reaction: H2 + Cl2 → 2 HCl(g) How many moles of HCl gas are produced if 15.5 L of Cl2 at STP and excess H2 are reacted? 1. 0.769 mol 2. 0.346 mol 3. 0.622 mol 4. 3.08 mol 5. 1.38 mol 6. 0.156 mol
Friday, May 1, 2015 by Anonymous

Chemistry
Sulfur dioxide reacts with chlorine to produce thionyl chloride and dichlorine oxide S: 32.0 amu O: 16.0 amu Cl: 35.45 amu SO2 + 2Cl2 --> SOCl2 + Cl2O If 0.400 moles of chlorine gas reacts excess sulfur dioxide, how many moles of dichlorine oxide are forme?
Friday, May 1, 2015 by Sara

Chemistry
Aluminum metal reacts with iron (III) oxide to produce aluminum oxide and iron metal. Answers the following three questions note: you will need to write a balanced equation to answer them Al: 26.9 amu Fe: 55.8 amu O: 16 amu 1 How many moles of iron (III) oxide are required to ...
Friday, May 1, 2015 by Sara

Chemistry
Solutions of sodium hypochlorite, NaClO are sold as bleach. They are prepared by the following reaction: 2NaOH + Cl2 --> NaCl + NaClO + H2O If you have 2.32 mol of NaOH and 2.74 mol of Cl2 ga available to react, answer the following questions Na: 23.0 amu Cl:35.5 amu O: 16....
Friday, May 1, 2015 by Sara

Chemistry
A flask contains 25.0 mL of diethyl ether weighth 18.74 µg (micrograms). What is the density of the diethyl ether and grams per liter?
Friday, May 1, 2015 by Sara

Chemistry
In an experiment, 13g of methanol and 11 g of carbon monoxide were placed in a reaction vessel. Given the following reaction C:12.0 amu O:16.0 amu H:1.0 amu CH3OH + CO --> HC2H3O2 1 What is the theoretical yield of acetic acid? 2 If the actual yield of acetic acid is 19.1 g...
Friday, May 1, 2015 by Sara

Chemistry
A mixture containing 11.9 g of calcium fluoride and 10.3 g of sulfuric acid is heated to drive off hydrogen fluorid. Given the following reaction what is the me maximum number of grams of hydrogen fluoride that can be obtied? Ca: 40.0 amu F: 19.0 amu H: 1.0 amu S 32.0 amu CaF2...
Friday, May 1, 2015 by Sara

Chemistry
Molarity What is the final volume (in Liters) of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?
Friday, May 1, 2015 by Sara

Chemistry
An organic compound consists of only carbon, hydrogen, and oxygen. Through combustion analysis, 5.671g of water and 36.933g of carbon dioxide are formed from 17.422g of sample. C:12.0 amu O: 16.0 amu H:1.0 amu In the space provided please write the empirical formula and, if ...
Friday, May 1, 2015 by Sara

Chemistry
Imagine that you have a 6.00L gas tank and a 3.00L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 125atm , to what pressure should you fill the...
Friday, May 1, 2015 by Anonymous

chemistry
Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ) −! NaOH(aq) + O2(g) What mass of O2 is produced when 24 g of Na2O2 react? What mass of water is needed to react completely with the Na2O2?
Friday, May 1, 2015 by Linda

Chemistry
Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both heat and gas bubbles, which help clear the drain clog. The reaction is 2 NaOH(aq) + 2 Al(s) + 6 H2O(ℓ) −→ 2 NaAl(OH)4(aq) + 3 H2(g) What mass of ...
Friday, May 1, 2015 by Anonymous

Chemistry
Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3 NO2(g) + H2O(ℓ) −→ 2 HNO3(ℓ) + NO(g) If 916 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured under the same ...
Friday, May 1, 2015 by Anonymous

chemistry
Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ∘C, the total pressure in the container is 4.50atm . Calculate the partial pressure of each gas in the container. Express...
Friday, May 1, 2015 by liz

chemistry
What is the resulting concentration when 250.0 mL of 0.65 M Magnesium Sulfate is added to 800.0 mL of water?
Friday, May 1, 2015 by Lisa

Chemistry
Consider the titration of 20.0mL of 0.300M acetic acid, HAc, with 0.150M NaOH solution. Ka=1.75*10^-5 HAc + NaOH ---> NaAc + H2O What is the composition of the solution at the equivalence point of the titration? Give both the formula of the compound and its concentration. ...
Friday, May 1, 2015 by Jonah

Chemistry
250.0 mg solid magnesium placed in 9.1 g aqueous zinc nitrate... What is the limiting reagent? I balanced the equation: Mg (s) + 2HNO3 (aq) -> Mg(NO3)2 (aq) + H2 (g) 250 mg 9.1 g
Friday, May 1, 2015 by Bob

Chemistry
There are three isotopes of phosphorus. Only one of them is stable. Calculate the binding energy per nucleon (in MeV) for P-32 (atomic mass = 31.9739 u). mass H = 1.007825 u and mass n = 1.008665 u. I multiplied the protons(15) by the mass H, and the neutrons(16) by the mass n...
Thursday, April 30, 2015 by JUNDY

chemistry
If 765000 J of energy are added to 7.90 L of water at 291 K, what will the final temperature of the water be? Answer in units of K.
Thursday, April 30, 2015 by zack

chemistry
Calculate the mass of oxygen gas required to occupy a volume of 6 L at a pressure of 20.9 kPa and a temperature of 37◦C.
Thursday, April 30, 2015 by sara

chemistry
how much copper sulfate do i need to make a solution of 100ml of 1M copper sulfate?
Thursday, April 30, 2015 by johnny

chemistry
Determine the percent yield for the following generic reaction using the information given below: Compound A --> Compound B if you start with 10.0 mL of Compound A and obtain 9.0 g of Compound B. Density of Compound A = 0.75 g/mL MW of Compound A = 150. g/mol MW Compound B...
Thursday, April 30, 2015 by Anonymous

Chemistry
I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
Thursday, April 30, 2015 by Jennie

Chemistry-is this right?
Water has a pH of 4.9? Calculate H3O and OH 1. H3O= 10^4.9=1.25*10^-5 2. OH= 14- 4.9= 9.1
Thursday, April 30, 2015 by Clare

chemistry
How to calcuate therotical pH 1.) 0.1 M HCl measured pH=1 2.) 0.1 M NaOH measured pH=13?
Thursday, April 30, 2015 by Clare

Chemistry
To titrate the acetic acid in 10.0 mL of vinegar sample, 25.5mL of 0.5M sodium hydroxide solution is needed. What is the concentration of acetic acid in the vinegar?
Thursday, April 30, 2015 by Anonymous

Chemistry
20.00mL of 0.55M CH3COOH solution is mixed with 9.95mL of 1.0M NaHCO3 solution. The reaction occurring is CH3COOH + NaHCO3 --> CH3CHOO + Na + H2O +CO2. Which is the limiting reagent in this reaction?
Thursday, April 30, 2015 by Kate

Chemistry Dr. Bob
I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
Thursday, April 30, 2015 by Jennie

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Thursday, April 30, 2015 by kim

Chemistry
I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
Thursday, April 30, 2015 by Jennie

chemistry
CH4 (g) + 2 O2 (g) --> CO2 (g) + 2 H2O (g), (triangle)H rxn =-802.3 kj How much heat is produced by the complete combustion of 237 g of CH4?
Wednesday, April 29, 2015 by Kim

chemistry
I posted my specific heat wrong. Now, how many joules is required to change temp of 225 g of lead from 5.0*C. specific heat of lead is 0.129J/g*C. I came up with 5805. It just doesnt look correct. Please help
Wednesday, April 29, 2015 by kimberly

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Wednesday, April 29, 2015 by kim

chemistry
How many joules is required to change the temp of 225 g of lead from 5.0*C to 25*C. specific heat of lead is 0.139J/g*C. I came up with 5805 and it just doesn't look right.
Wednesday, April 29, 2015 by kimberly

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Wednesday, April 29, 2015 by kim

Chemistry
H2S+H2O<-> H3O +HS why THIS BUFFER SOLUTION IS ABLE TO RESIST CHANGE IN PH WHEN SMALL AMOUNTS OF OH ARE ADDED TO IT.
Wednesday, April 29, 2015 by Clare

Chemistry
Describe how you would prepare 250.0 mL of a 0.1500 M NaCl solution given that the NaCl is supplied as a solid. Describe how you would prepare 1.25 L of a 0.025 M sucrose solution from a stock solution with concentration of 5.00 M. What is the benefit of adding salt to water ...
Wednesday, April 29, 2015 by Caitie

Chemistry-is this right?
pH: 4.9 Calculate: H3O H30= 10^-pH H3O=10^-4.9 H30=1.25 * 10^-4 AND CALCULATE OH=14-pH OH=14-4.9 OH= 9.1
Wednesday, April 29, 2015 by Clare

Chemistry
Solarcaine aerosol spray is used for temporarily relieving pain as it works as a topical anesthetic numbing the skin. Solarcaine is in fact benzocaine, C9H11NO2 with molar mass 165.2 g/mol. If a 100.0 mL spray can contains 1.00 g of benzocaine, calculate the pressure within ...
Wednesday, April 29, 2015 by Caitie

Chemistry
Liquid vitamin C, (ascorbic acid) C6H8O6 , readily reacts with atmospheric oxygen, O2, to form liquid dehydroascorbic acid, C6H6O6 and water. Explain why this is a chemical reaction. Write a balanced equation for this reaction. How many mole of oxygen gas is required to react ...
Wednesday, April 29, 2015 by Caitie

Chemistry
C6H12O6 (aq) = 602 (g) - 6CO2 (g) = 6H20 (l) H -2837 A)Exo or endothermic? B)write an expression for the equilibrium constant C)Give the value of the equilibrium constant is very large, would this reaction be fast or slow? D)effects of equilibrium if.. i. incerasing temp ii. ...
Wednesday, April 29, 2015 by Caitie

Chemistry
Calculate the pH of the resulting solution if 50 cm3 of 0.045mol dm-3 solution of C5H5N is mixed with 100 cm3 of 0.035 mol dm-3 of C5H5NH+
Wednesday, April 29, 2015 by Morgan

Chemistry
Based on the following balanced equation: 2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O a. How many moles of CO2 are produced after complete reaction of 8.00 moles of C4H10? b. How many grams of CO2 are produced after complete reaction of 8.00 moles of C4H10? c. How many moles of H2O ...
Wednesday, April 29, 2015 by Anonymous

Chemistry
Based on the following balanced equation: 2 NH3 + 2 O2 -->N2O + 3 H2O a. How many moles of O2 are required to react completely with 6.00 moles of NH3? b. How many grams of O2 are required to react completely with 6.00 moles of NH3? c. How many moles of H2O are produced ...
Wednesday, April 29, 2015 by Anonymous

chemistry
Solution equals 0.015 M HCl Find OH Find pH Isn't pH=1.8? I don't know how to find OH :( Is there a formula or do subtract 14-1.8? I'm confused and I got this assignment today yet we haven't gone over anything yet.
Wednesday, April 29, 2015 by Clare

Chemistry-is this correct?
Calculate the pH and identify as acidic, basic,or neutral 1. H= 1.10 * 10^-11 M Answer: pH=11, basic 2. H= 2.61 * 10^-2 M Answer: pH:1.58, acidic 3. OH= 4.0 * 10^-9 M pH: 8.39, basic
Wednesday, April 29, 2015 by Clare

chemistry
the acid dissociation constant of dichloroethanoic acid is 0.033 . calculate the concentrations of hydrogen ions
Wednesday, April 29, 2015 by Anonymous

Chemistry
Calculate OH and H pH= 12 How to set this up
Wednesday, April 29, 2015 by Clare

Chemistry- is this right?
Calculate the H+ of 0.1 M NaOH Calculate the pH of 0.1 M NaOH [H+]=10^ph [H+]=10^-13 [H+]=1*10^-13M Since pH+ pOH=14 pH= -log (0.1M) pH=1 so 14-1 pH= 13
Wednesday, April 29, 2015 by Clare

Chemistry
Calculate the H+ for number #2 #2 : H+ = 10^-2, with a pH of 2 Not sure how to calculate H+
Wednesday, April 29, 2015 by Clare

Chemistry
A standard of red dye was prepared in the following manner: 4.5mL of 0.100M of food dye was added to a test tube and 5.5mL of water was added. What was the final concentration of food dye in the test tube?
Wednesday, April 29, 2015 by Kate

Chemistry
66.9 g of a substance X dissolves in enough water to make 0.428 L of a 0.68 M solution. Calculate the molar mass of X in g/mol.
Wednesday, April 29, 2015 by Devin

Chemistry
A 0.885 M solution of sulfuric acid (H2SO4) is to be reacted with a 0.552 M solution of sodium hydroxide to make sodium sulfate and water. How many L of the H2SO4 solution will react with 0.842 L of the NaOH solution? Give your answer to 3 decimal places.
Wednesday, April 29, 2015 by Devin

CHEMISTRY
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 5.35 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
Wednesday, April 29, 2015 by torri

Chemistry
Carbon monoxide and hydrogen react according to the equation: CO(g) + 3H2(g) CH4(g) + H2O When 1.00 mol CO and 3.00 mol H2 are placed in a 1L flask at 1200K and allowed to come to equilibrium, the reaction mixture is found to contain 0.387 mol H2O. What is the molar ...
Wednesday, April 29, 2015 by Emily

chemistry
Table of enthalpy of solution for selected cesium salts Compound and ΔsolH kJ mol-1: - Cesium bromide: 25.98 - Cesium iodide: 33.35 - Cesium chloride: 17.78 - Cesium fluoride monohydrate: -10.46 - Cesium fluoride sesquihydrate (·1.5H2O): -5.44 Data taken from CRC ...
Wednesday, April 29, 2015 by john

chemistry
Calculate the freezing point of 1molar aqueous solution (density =1.04g) of kcl (kf for water =1.86)K=39,cl=35.5
Wednesday, April 29, 2015 by shubham

Chemistry
Calculate the pH of the resulting solution if 50 cm3 of 0.045mol dm-3 solution of C5H5N is mixed with 100 cm3 of 0.035 mol dm-3 of C5H5NH+
Wednesday, April 29, 2015 by Morgan

chemistry
Calculate the concentrations of all ions after 50.0 mL of a 0.100 M AgNO3 solution is mixed with 100.0 mL of a 1.00 M Na2SO4 solution.For Ag2SO4 Ksp = 1.2 x 10-5 Do I first do MiVi=MfVf and then using the two concentrations I use ksp value? I'm just so confused.
Wednesday, April 29, 2015 by Anon

Chemistry
Sulfur trioxide decomposes into sulfur dioxide and oxygen in an equilibrium. You have a 3.00 L vessel that is charged with 0.755 mol of SO3. At equilibrium, the amount of SO3 is 0.250 mol. 2 SO3 (g) ----> 2 SO2 (g) +O2 (g) A) calculate the equilibrium concentrations of SO2 ...
Tuesday, April 28, 2015 by Ashley

Chemistry
A sample of krypton gas occupies 95.0 mL at 0.500 atm. If the temperature remained constant, what volume would the krypton occupy at (a) 5.00 atm, (b) 0.0500 atm, (c) 555 torr, (d) 5.00 torr, and (e) 5.5 3 1022 torr?
Tuesday, April 28, 2015 by Alicia

Chemistry
Determine the energy absorbed as two moles of Nitrosyl Chloride are disassociated into nitric oxide and chlorine gas (used bond energies of kJ per mole to determine your net energy released in Joules): 2NOC1(g)-->2NO(g)+C12
Tuesday, April 28, 2015 by Sam

Chemistry
Determine the energy absorbed as two moles of Nitrosyl Chloride are disassociated into nitric oxide and chlorine gas (used bond energies of kJ per mole to determine your net energy released in Joules): 2NOC1(g)-->2NO(g)+C12
Tuesday, April 28, 2015 by Sam

Food Chemistry
A new food colorant has a molar absorptivity of 3.8x 10^3 cm^-1M^-1 at 510 nm: (1) what will be the absorbance of a 2X10^-4 M solution in a 1 cm cuvette determined at 510 nm; (2) what will be the percent transmittance (T%) of the solution in (1) in this case
Tuesday, April 28, 2015 by knolan

chemistry
is the reaction between Copper sulfate and zn exothermic or endothermic and does that involve the activity series?
Tuesday, April 28, 2015 by johnny

Chemistry
A 1X Phosphate Buffered Saline solution was prepared by adding 1.44g of Na2HPO4 and 1.44g of H2PO4- to 800mL of water. Additional components were dissolved in the solution: 8g of NaCl, 0.2g of KCl and 0.24g KH2PO4. The resulting buffer solution had a pH of 7.2. a. Calculate ...
Tuesday, April 28, 2015 by Nicole

Chemistry
In a basic solution how does the concentration of H3O+ compare to concentration of OH-?
Tuesday, April 28, 2015 by Anonymous

chemistry
Lithium chlorate is decomposed with heat to give lithium chloride and oxygen gas. If 2.23g of lithium chlorate is decomposed, how many milliliters of oxygen are released at stp?
Tuesday, April 28, 2015 by kimberly

Chemistry
How does a pH of a buffer solution go outside of its range?
Tuesday, April 28, 2015 by Avery

chemistry
Calculate the approximate pH of a 0.1 M solution of ethanoic acid at 298 K, given that the dissociation constant, Ka, is 1.75 x 10-5 mol/L at 298 K.Ethanoic acid dissociates in aqueous solution as follows: CH3COOH(aq) + H2O H3O+(aq) + CH3COO-(aq)
Tuesday, April 28, 2015 by Emily

Chemistry
Cobalt and nickel can be simultaneously determined by formation of their coloured complexes with 8-quinolinol in solution. Molar extinction coefficients are: εCo = 3529, and εNi = 3228 cm-1 M-1 at 365 nm; and εCo = 428.9 and εNi = 0 cm-1 M-1 at 700 nm. ...
Tuesday, April 28, 2015 by FilthyF

analytical chemistry
What weight of potassium acid phthalate(KHC8H4O4) is required to react with 25 ml OF 0.5N NaOH solution
Tuesday, April 28, 2015 by jeslf

Chemistry
In which condition(s) can I get this reaction: Fe + H2SO4 = Fe2(SO4)3 + H2
Tuesday, April 28, 2015 by Keal

chemistry
the wavelength(nm)of a ball bearing with a mass of 10g, and a velocity of 10cm/s is what?
Tuesday, April 28, 2015 by Fernando

Chemistry
How many moles of ammonium nitrate is created from 10.7 grams of ammonium nitrate? Thus how many grams of ammonium nitrate is needed to make exactly one mole of ammonium nitrate?
Monday, April 27, 2015 by E'Manuel

Chemistry
What is the molality of a solution of aluminum nitrate that contains 77.0 g of Al(NO3)3 dissolved in 120.0 g of water? Use molar masses with at least as many significant figures as the data given.
Monday, April 27, 2015 by Heather

Chemistry
The soda was found to have a sugar concentration of 9.6% (wt./vol.). How many teaspoons of sugar are in a can of soda? (One can is 12fl.oz or 355mL) (1 teaspoon is approx. 4g)
Monday, April 27, 2015 by Carrie

Chemistry
When aqueous solutions of lead(II) ion are treated with potassium chromate solution, a bright yellow precipitate of lead(II) chromate, PbCrO4, forms. How many grams of lead chromate form when a 1.60-g sample of Pb(NO3)2 is added to 24.0 mL of 1.01 M K2CrO4 solution?
Monday, April 27, 2015 by Jamie lee

chemistry
An atom whose nucleus contains 7 neutrons and which has a mass number of 12 is an isotope of what element?
Monday, April 27, 2015 by danny

chemistry
What is the approximate effective nuclear charge for arsenic ?
Monday, April 27, 2015 by danny

chemistry
q4 What element has the greatest first ionization energy? Li Na K Rb Cs
Monday, April 27, 2015 by danny

Chemistry
How much SO2 is needed to saturate 50g of H2O at 5 degrees Celsius
Monday, April 27, 2015 by Sophia

chemistry
A 3.50L sample of neon gas has a pressure of 0.950 atm at 20 degrees C. What would the volume be if the pressure increased to 1.50 atm and the temperature remained constant?
Monday, April 27, 2015 by sun

Organic chemistry
Help with prediction products of a reaction! 4-phenylbutanoyl chloride + AlCl3 --> ? the molecular formula of the product is C10H10O, and I need to determine the product. I was thinking an acylium ion would form, and then the carbonyl carbon would form a bond with the ring ...
Monday, April 27, 2015 by anonymous

chemistry
A sample of potassium hydrogen oxalate, KHC2O4, weighing 0.717 g, was dissolved in water and titrated with 18.47 mL of an NaOH solution. Calculate the molarity of the NaOH solution.
Monday, April 27, 2015 by mary

Analytical Chemistry
Any help/advice on answering this question would be a big help! :) The analysis of lead (Pb) in a sample of solder was carried out using atomic absorption spectroscopy as follows. 1.013 g of solder was completely dissolved in a small volume of nitric acid and the solution made...
Monday, April 27, 2015 by Chris

Chemistry
Calcium hydroxide has Ksp = 5.5 x 10-5 at 25 oC and a molar mass of 74.10 g/mol. How many grams of calcium hydroxide are needed to create 365 mL of a saturated solution of calcium hydroxide at 25 oC?
Monday, April 27, 2015 by Molly

Chemistry
The radioactive nuclide 18F decays by first order kinetics with a half life of 1.83 hr. How many hours will it take for 68.5% of a give quantity of 18F to decay?
Monday, April 27, 2015 by Molly

Chemistry
20.0 mL of a 0.18 M HCl solution are combined with 50.0 mL of a 0.085 M NaOH solution. What is the pH of the resulting solution?
Monday, April 27, 2015 by Molly

chemistry
Can aluminum (Al) react with K2SO4 by single replacement to yield products? Using the activity series chart, I know that K is more reactive than Al so does that mean that a reaction will occur or not?
Monday, April 27, 2015 by Ally

chemistry
Which way will the equilibrium shift when subjected to the following changes? 2NOBr + heat <-> 2NO +Br2? NO is addded temp. doubled Br2 removed Pressure increased I said: reverse, forward, forward, forward
Monday, April 27, 2015 by Clare

Chemistry
Hi, Iodine has 53 electrons and configuration of: 2, 8, 18, 18, 7. Why does the fourth shell not reach maximum and therefore it picks up 7 electrons and begins a new shell. Thank you.
Monday, April 27, 2015 by Steph

Chemistry
A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25-g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at -4.00°C. Which of these choices is its molecular formula?
Monday, April 27, 2015 by Confuse

Chemistry
A 0.642 g sample of an unknown gas was collected over water at 25 C and 1.04 atm. The collection cylinder contained 151.3 mL of gas after the sample was released. Find the molar mass of the unknown gas?
Monday, April 27, 2015 by Anonymous

Chemistry
Samples of NH3 and 02 are placed in a rigid container. When the equilibrium below is established, the partial pressure of H2O is 0.784 atm. What is the partial erasure of NO when the system is at equilibrium? 4NH3 + 5O2 -----> 4NO + 6H2O
Monday, April 27, 2015 by Anonymous

chemistry
Suppose that a student performing this experiment recorded the concentration of NaOH solution as 0.513 M, instead of the correct value of 0.531 M. Assuming there were no other errors, would each of the following experimental results be high, low, or unaffected by the error? ...
Sunday, April 26, 2015 by kales

chemistry
please help !!! You are given an organic solid which reacts with most organic solvents. How would you obtain the IR spectrum of it?
Sunday, April 26, 2015 by katherine

Chemistry
Calculate the energy in Joules, of a photon of blue light have a frequency of 5.0 x 10^14 hertz. E=hv v=C/ƛ v= 3.00x10^8/5.0x10^14= 6x10^-7 E=(6.626x10^-34) (6x10^-7)= 3.9x10^40 Joules What am I doing wrong? I got this wrong on my exam and have a final tomorrow, so any ...
Sunday, April 26, 2015 by Stacie

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