10/23/17

I am struggling with this thermochemistry reaction problem
For the the reaction: 4Fe+3O2==>2Fe2O3 delta H = -1652kJ   A. How much heat is released whem 4.00mol iron is reacted with excess O2?   B. How much heat is released when 1.00mol of iron is... more
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10/23/17

I am struggling with this AP Chemistry Problem
A balloon filled with 39.9 mol of helium was a volums of 876 L at 0.0°C and 1 atm. The temperature of the balloon increased from 38.0°C as it expands to a volume of 998L, the pressure remaining... more
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10/20/17

Can you help me with this problem about a magnesium metal reaction?
Magnesium metal is reacted with excess HI to produce hydrogen gas. The gas is collected over water. 45.82mL of the wet hydrogen gas is collected at 30.0°C. The water level in the eudiometer is... more
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10/17/17

Number of moles of chlorine which has reacted
This is for a chemistry lab that I am  doing.    
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09/07/17

Types of chemical reactions and solution stoichiometry
What mass of Na2CrO4 is required to precipitate all of the silver ions from 75.0 mL of a 0.100-M solution of AgNO3?
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09/04/17

If 56.8 mL of BaCl2 solution is needed to precipitate all the sulfate ion in a 772-mg sample of Na2SO4, what is the molarity of the solution?
Just need a little bit of help.  thanks!
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08/28/17

naturally occuring cobalt
chemistry   Naturally occurring cobalt consists of only one isotope, 59Co, whose relative atomic mass is 58.9332. A synthetic radioactive isotope of cobalt, 60Co, relative atomic mass 59.9338, is... more
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08/23/17

Do I round the atomic mass of an isotope?
I did an calculation of mass for an isotope, and I got 28.08568 amu. And I need to leave two decimal places. I am unsure whether I will get it wrong if I don't round the mass.
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07/18/17

Periodic Elements related doubt
why are the 4 elements in the periodic table have not been found?
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07/18/17

So im doing this equation in chemistry CH4 + Cl2-CCl+HCl
So im doing this equation in chemistry CH4 + Cl2-CCl+HCl and it says there are 5 Cl but how do i know if there is 5 Cl
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07/11/17

Which compound burns with the most dense flame: ethane, propane, butane or benzene?
Need just a short answer, thank you!
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06/06/17

What is the heat of formation of hexane, C6H14?
 What is the heat of formation of hexane, C6H14?
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03/08/17

Why is the acid always the electron withdrawing group and the base always the electron donating group?
Why is the acid always the electron withdrawing group and the base always the electron donating group?
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11/09/16

rate of reaction
2A + B → C + D The rate of disappearance of A in the reaction above is - d[A]/dt = K[A][B]2 What happens to the rate of appearance of C if the concentration of A is doubled and that of B is tripled? more
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10/24/16

why and what are muratic acid and hydrolocolic acid differences?
why and what are muratic acid and hydrolocolic acid differences?
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01/20/16

WHAT REACTION TAKES PLACE WHEN WE MIX HNO3 WITH HCL OR CH3COOH ?
Please anybody answer my question
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01/12/16

Aliphatic or aromatic
I have this exam question: a) Log P for ibuprofen is 3.6, whereas the value for phenylacetic acid is1.4. Use selected data from the table to estimate the hydrophobicityconstant (π) for the... more
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12/03/15

how do you solve this. Write the formation constant, kf for following complex ion formation process: Cu2+ + 4NH3=== Cu(NH3)4^2+
Chemistry: Formation Constant
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04/25/15

What minimum volume of 12 M HCl would be required to consume a 15.5 g iron bar on a padlock? Would this amount of acid fit inside a standard pen?
 What minimum volume of 12 M HCl would be required to consume a 15.5 g iron bar on a padlock? Would this amount of acid fit inside a standard pen? (5) 
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04/25/15

Standard Form
Write 0.08909 in standard form   correct to two significant figures
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04/22/15

An aqueous solution contains 0.233 M KHCO3 and 0.268 M H2CO3. The pH of this solution is?
I don't know how to calculate pH for diprotic buffers.    An aqueous solution contains 0.166 M NaHCO3 and 0.200 M H2CO3. The pH of this solution is?   That's the other one I'm unsure of.
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03/25/15

Chemistry enthalpy/ entropy help!!
Use Hess’s Law to determine the ΔH for the combustion of liquid methanol (CH3OH). Using your answer from the previous question, how much energy will you get from burning 230.0 g of methanol in... more
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03/25/15

Please help in chemistry!
Use bond energies to determine the ΔH for the combustion of methane (CH4). Please show work so i know how to do it on my own! Thanks
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03/14/15

Lewis structure of CNO3+ ion.
lewis structure of CNO3+ ion
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