214 Answered Questions for the topic College Chemistry

02/18/16

n an actual combustion expirement 88 grams of propane produced 176 grams. how many grams of co2 should have been produced theoretically
in an actual combustion expirement 88 grams of propane produced 176 grams. how many grams of co2 should have been produced theoretically
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College Chemistry

02/05/16

Full question is in the description
the ratio of oxygen to nitrogen by mass in NO2 is 2.29. The ratio of chlorine to nitrogen by mass in NCl3 is 7.61. Find the ratio of oxygen to chlorine by mass in Cl2O.
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College Chemistry Biology Chemistry

01/25/16

How many grams of sucrose are needed to prepare 100 mL of 5% sucrose?
I know the molecular weight of sucrose is 342 g/mol
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01/20/16

CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...
Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal violet with 2.0 mL of 0.100 M NaOH and 4.0 mL of distilled water.    I am so so so... more
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College Chemistry Math Chemistry Molar Mass

01/13/16

A volume of 253 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0
A 0.548 gram sample of a metal, M, reacts completely with sulfuric acid according to:M(s)+H2SO4(aq) -> MSO4(aq)+H2(g)A volume of 253 mL of hydrogen is collected over water; the water level in... more
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College Chemistry

12/04/15

What is the boiling point of an aqueous solution that freezes at -5.5 °C?
The equation that was given in class doesn't make sense I need some guidance on how to solve this problem.
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College Chemistry

12/04/15

Ammonia burns in air as follows: 4NH3(g) + 3O2(g) ? 2N2(g) + 6H2O(g)
I am trying to figure out this question, but I have no idea how. Please help!   Ammonia burns in air as follows: 4NH3(g) + 3O2(g) → 2N2(g) + 6H2O(g), How many liters of N2(g) are formed by... more
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College Chemistry

11/14/15

Titration question
When a 21.1 mL sample of a 0.403 M aqueous hydrocyanic acid solution is titrated with a 0.420 M aqueous sodium hydroxide solution, what is the pH at the midpoint in the titration
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College Chemistry

10/09/15

If a wavelength is .089 nanometers, how much energy is it giving off in Joules per mole?
A wavelength of light is 0.089 nm.  How many Joules per mole is it giving off.   I got 3.79 *10-39 J/mol   but I don't think that's right.
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College Chemistry Chemistry Chem Ap Chemistry

09/22/15

Ionic Size
I really don't understand what this is asking... please help.   1.) As you move left to right across the period, there are two elements that instead show a decrease in ionization energy. Identify... more
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09/20/15

Perform a rxn to obtain 5 g ethyl bromide. Assuming that a normal percentage yield is 85%, what min quantity of materials needed to give desired product
Density of ethyl bromide is 1.47 g/cm3 Molecular mass of ethyl bromide is 108.97 g/mol   I need the answer in mL ethanol and mL phosphorus tribromide
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College Chemistry

04/17/15

to 25ml of 023 molar ammonium hydroxide solution 25 ml of 0.25 M HCl is added. What will be the ph of the resulting solution?
i am struggling to figure out to to get ph using the kb value for ammonium hydroxide of 1.8x10^-5. 
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College Chemistry Chemistry

04/13/15

determine which experiences a lower effective nuclear charge.
using words and/ or drawings explain why. A) an electron in a 2s or an electron in a 2p B) a valence electron on sulfure or a valence electron on silicon C) a valence electron on chlorine or a... more
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College Chemistry Chemistry

04/07/15

For The reaction: A + B ? C + D, the rate law was found by experiment to be: rate=k[B]2. What is the effect of doubling the concentration of B?
The rate would be doubled. The rate would be one quarter as great. The rate would be four times as great. The rate would be unchanged. The rate would be cut in half.
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College Chemistry Chemistry

03/23/15

Which of the following compounds contains a nonpolar covalent bond-
MgF2 NaCl H2O N2
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College Chemistry Stoichiometry

03/17/15

AgNO3(aq)+KCl(aq)?AgCl(s)+KNO3(aq)
Part AWhat mass of silver chloride can be produced from 1.19L of a 0.293M solution of silver nitrate?Express your answer with the appropriate units.mass of AgCl =Part BThe reaction described in... more
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College Chemistry

02/08/15

How many joules of heat are released when 30g of benzene vapor condense at its boiling point. benzene at its boiling is 393 J/g
can anyone answer it ASAP
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College Chemistry Chemistry

02/04/15

After 80.0 min, 26.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics?
After 80.0 min, 26.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics?
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College Chemistry Chemistry

02/01/15

When 2.35 g of a nonelectrolyte solute is dissolved in water to make 755 mL of solution at 22 °C, the solution exerts an osmotic pressure of 835 torr.
When 2.35 g of a nonelectrolyte solute is dissolved in water to make 755 mL of solution at 22 °C, the solution exerts an osmotic pressure of 835 torr. 1)What is the molar concentration of the... more
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College Chemistry Chemistry

01/30/15

chemistry question
At –13.5 °C (a common temperature for household freezers), what is the maximum mass of sucralose (C12H19Cl3O8) you can add to 3.00 kg of pure water and still have the solution freeze? Assume that... more
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College Chemistry Chemistry

01/30/15

A solution is made by dissolving 0.504 mol of nonelectrolyte solute in 823 g of benzene. Calculate the freezing point, Tf, and boiling point, Tb, of the solutio
A solution is made by dissolving 0.504 mol of nonelectrolyte solute in 823 g of benzene. Calculate the freezing point, Tf, and boiling point, Tb, of the solution. Constants may be found here.
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College Chemistry Chemistry Conversions

01/30/15

Chemistry Convert the following quantities:
8.87 x 10^27 P4O10 molecules ---->  _____ atoms   1.129 x 10^20 formula units PbCl4 ----> _______ mol ions
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College Chemistry Chemistry

01/21/15

label the phase diagram for carbon dioxide
label the phase diagram for carbon dioxide  I am having trouble with this.
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College Chemistry Chemistry

01/21/15

chemistry How much heat energy is required to boil 20.5 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.
How much heat energy is required to boil 20.5 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.
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College Chemistry General Chemistry

12/09/14

Calculating E° Problem, just need to be pointed in the right direction! Double Karma points for any advice offered!
Okay, so I have a half reaction (a reduction), Cd(IO3)2(S) + 2e- ----> Cd(s) + 2IO3-, for which I need to calculate E°. E° for Cd2+ --> Cd(s) is given as -0.402V, and Ksp for Cd(IO3)2 is... more
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