315 Answered Questions for the topic General Chemistry

General Chemistry Chemistry College Chemistry

04/12/16

Using a Manometer to Measure Gas Pressure PROBLEM
If the gas inside the flask in the above exercise is cooled so that its pressure is reduced to a value of 715.7 torr what will be the height of the mercury in the open-end arm? (Hint: The sum of... more
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04/10/16

Redox titration question? Determine the molarity of a solution? PLEASE HELP!!
Q1. Iron is often used to standardize permanganate solutions. A 0.158 g sample of pure iron wire was dissolved in dilute sulfuric acid to form a solution of iron (II) sulfate. This was titrated... more
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General Chemistry

04/03/16

How many moles of PI3 form when 0.305 moles of P and 0.521 moles of I2 react according to, 2P+3I2=2PI3
 Having trouble understanding if this has to do with theoretical yield.
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General Chemistry Chemistry College Chemistry

03/29/16

Lewis Structure problem
I AM SO CONFUSED WITH THIS ONE CHOICES ARE 3,4,5,6,7   Phosphorus oxychloride has the chemical formula POCl3, with P as the central atom. In order to minimize formal charge, how many bonds does... more
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General Chemistry Chemistry

03/21/16

Write the electron configuration in order of increasing energy
Co^2+ (Cobalt 2+)    This is a mastering chem question which i could not get right after several tries   my tries are    [Ar]3d^7   [Ar]4s^03d^7   [Ar]4s^23d^5
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General Chemistry

03/14/16

if log x= -1200.340, find x. express your answer in scientific notation
if log x= -1200.340, find x. express your answer in scientific notation.
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General Chemistry Chemistry College Chemistry

03/09/16

PLEASE HELP ME WITH CHEM TITRATION PROBLEM??!!!
A 25.0 mL sample of 0.150 M hypochlorous acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The Ka of hypochlorous acid is 3.0 × 10-8.   7.51 11.47 7.54... more
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General Chemistry Chemistry Titrations Acid Base

03/09/16

Buffer/Titration Chemistry Problem??! PLEASE HELP - I AM LOST!!!
A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 66.2 mL of KOH is __________ M. 0.723 1.00 × 10-7 2.81 × 10-13 0.439... more
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03/09/16

CHEM 2 Solubility Equilibrium Question?? PLEASE HELP!?
Hi everyone. I have two questions that I think I found the answer to, but could you check and see if they are right? If they are incorrect, could you show me how you achieved the correct answer?... more
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General Chemistry

03/09/16

A cube of gold-colored metal with a volume of 54 cm^3 has a mass of 980g.The density of the gold is 19.3g/cm^3. is this sample of pure gold? why or why not?
Trying to find if the gold is pure or not?
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General Chemistry Chemistry Ap Chemistry Chemisty

03/07/16

Having major trouble with this... Question is down below please show work and answer thanks!
Question #1 In a titration 23.46 ml of 0.00325 M Ba(OH)2 neutralized 13.8 ml of HCL solution. What is the molarity of the HCl solution? Answer in units of M     Question #2  Find the molarity... more
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03/04/16

Having trouble with these questions below... Please help show work and answer thanks!
Question #1 If 23.67 mL of a solution of Ba(OH)2 requires 15.05 mL of a 1.082 M solution of HNO3 for complete titration, what is the molarity of Ba(OH)2 solution?  answer in units of... more
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General Chemistry Chemistry College Chemistry

02/19/16

You carefully weigh out 17.00 g of CaCO3 powder and add it to 68.85 g of HCl solution. You notice bubbles as a reaction takes place. (contnd at description)
Question:You carefully weigh out 17.00 g of CaCO3 powder and add it to 68.85 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it... more
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General Chemistry Le Chatlier's Principle

02/17/16

Help with Le Chatlier's Principle question?? Please HELP?????? GENCHEM2
Hi everyone, I am really stuck on this problem, and I don't really think I understand Le Chatlier's principle very well. However, I would like to learn for sure!! Thank you for the help!!!   For... more
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General Chemistry Chemistry Equilibrium

02/17/16

Chemistry Equilibrium Problem? Calculate the partial pressure of a reactant? PLEASE HELP!??
I am really stuck since I am new to equilibrium and would love if someone could show me how to solve this so I can learn!   For the reaction 4KO2(s) + 2H2O(g) ↔ 4KOH(s) + 3O2(g), an equilibrium... more
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02/17/16

Find the equilibrium concentration of hydrogen? PLEASE HELP and CHECK MY ANSWER?
The reaction N2 + 3H2 ↔ 2NH3 at equilibrium was found to contain 1.00 M of nitrogen and 0.500 M of ammonia. Calculate the equilibrium concentration of hydrogen if Kc = 0.988.I really want to make... more
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02/08/16

What does a double-headed arrow mean in a chemical equation?? PLEASE HELP!!! I AM LOST?
I am doing a lab where the chemical reaction is Fe^+3 (aq) + NCS^-1 (aq)<---      FeNCS^+2 (aq)                                                                                                  ... more
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02/08/16

Question is below. I need help I can't figure it out please show work and answer thanks!
There are 2 part to the question I figured out the first part but don't understand the second part Question part #1A solution is prepared by dissolving 25.0 g of sucrose (C12H22O11) in 377 g of... more
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02/08/16

Question is down below. Please help I'm having serious trouble with this. Please show work and answer. Thanks appreciate it!
this question has 2 parts I answered the first part but don't know how to do the second part. Question part #1 Suppose you wanted to find out how many milliliters 2.2 M AgNO3 are needed to provide... more
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General Chemistry Chemistry Molar Mass Help

01/27/16

CHEMISTRY PLEASE HELP?!!!Determine the molar mass of a compound - given freezing point and masses of components in a solution?
A company is studying the use of a compound as a potential antifreeze. When 0.243 g of the compound is dissolved in 25.0 g of water, the freezing point of the solution is -0.201 * Celsius.   a.... more
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General Chemistry Chemistry Solutions Water Vapor

01/27/16

Calculate the vapor pressure of a solution? CHEMISTRY - Please check my answers??!!
Calculate the vapor pressure of water above a solution made by adding 15.0 g of lactose (C12H22O11) to 100.0 g of water at 338 K. (vapor pressure of pure water at 338 K is 187.5 torr) P (vapor... more
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01/27/16

Calculate the vapor pressure of water above a solution. Please check my work??? General Chemistry
Calculate the vapor pressure of water above a solution made by adding 15.0 g of lactose (C12H22O11) to 100.0 g of water at 338 K. (vapor pressure of pure water at 338 K is 187.5 torr)   P (vapor... more
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General Chemistry Chemistry Solutions

01/27/16

Determine how many moles of particles are present in 1.0 L of the following solution? Please check my answer? Chemistry
0.02 M CuSO4   Can you check my work? Since CuSO4 is a m + nm, it is an ionic compound and will break up into ions in a polar? solution.   (0.02 mol CuSO4 / 1.0 L soln)(2 ions/1 mol CuSO4) =... more
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General Chemistry Chemistry Solutions Cemistry Stuck

01/27/16

CHEM HELP PLEASE? Solution problem involving mass percent? What is the mass % of ammonium chloride in the solution?
At 20°C, a 3.54 M aqueous solution of ammonium chloride has a density of 1.0512 g/mL. The formula weight of NH4Cl is 53.50 g/mol.options:6.953.360.2974.1018.00I know mass % = mass of solute/mass of... more
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01/26/16

Please help... I need explanation and answers thank you!
Question #1A 1335 mL sample of oxygen (O2) was collected by displacement of water at 24 degrees celsius under a total barometric pressure of 425 torr. What mass of dry oxygen was collected? The... more
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