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Hello,
I needed some help with my Chemistry Homework. I have 4 questions that I'm not so sure of the answer. I've given my best try. Please if someone can help me correct my answers or tell me which one is the right one and how to determine/solve it... Thanks in advance.
[b]Question One:[/b]
Which gas is expected to be more soluble in H2O?
a) O2
b) Cl2
c) HF
d) H2
e) HCl
** I think that Oxygen gas is more soluble in H2O.
[b]Question Two:[/b]
Which produces the greatest number of Ions when one mole dissolves in water?
a) NaCl
b) NH4NO3
c) NH4Cl
d) Na2SO4
e) Sucrose
** I think its (e) Sucrose. I tried converting the molar mass which (e) has the highest (342.29g/mol) to # of Ions (6.022x10^23)
[b]Question Three:[/b]
A 1.34m (Molality) aqueous solution of compound X had a boiling point of 101.4 degrees Celcuis. Which one of the following could be compound X? The boiling point elevation constant Kbp for water is 0.52 degrees Celcuis/m (Molality).
a) CH3CH2OH
b) C6H12O6
c) Na3PO4
d) KCl
e) CaCl2
** I have no clue how to do this one. I tried using the Boiling Point of Elevation equation (delta)(T)= Kbp x m but I don't know what to do afterwards. Please explain this one.
[b]Question Four:[/b]
The activation energy of a reaction is 76.7KJ/mol. How many times faster will the reaction occur at 50 degrees Celcuis that at Zero (0) degrees Celcuis (assume equal initial concentrations).
a) 50
b) 70
c) 120
d) 190
e) 360
** Dont know how to approach this question either. Please explain.
Any help will be appreciated.
Regards,
Katrina
gettrinatak007@yahoo.com
Chemistry Homework Help
- Posted in the Chemistry Forum
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hi
ican hwlp you with finding answers with explanations |
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** I think that Oxygen gas is more soluble in H2O.
got to be hcl....you can make a concentrated HCL solution; it will completely dissociate in water and so has the greatest attraction for water...
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Joined: Jul 30, 2007 Comments: 3 Moscow ISP: Moscow, Russia |
[b]Question Two:[/b]
Which produces the greatest number of Ions when one mole dissolves in water? a) NaCl b) NH4NO3 c) NH4Cl d) Na2SO4 e) Sucrose ** I think its (e) Sucrose. I tried converting the molar mass which (e) has the highest (342.29g/mol) to # of Ions (6.022x10^23) Sucrose is not dissociate in water, therefore it doesn't produce ions. NaCl = Na + Cl (2 ions) NH4NO3 = NH4 + NO3 (2 ions) NH4Cl = NH4 + Cl (2 ions) Answer: Na2SO4 = 2Na + SO4 (3 ions) |
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v = A*exp(-Ea/RT) v2/v1=A*exp(-Ea/RT2)/A*exp(-Ea /RT1)=exp(-Ea/RT2+Ea/RT1)= =exp(Ea/RT1 - Ea/RT2) T(Kelvins)=t(Celcuis)+273 v2/v1=exp(76700/8.31*273-76700 /8.31*323)=exp(5.23)=186.8 times |
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What is the standard molar gibbs energy and enthalpy of formation for liquid isopentyl alcohol (3-methyl-1-butanol) and liquid isopentyl acetate (banana oil) in kJ/mol? Also, what is the constant pressure heat compacity of liquid banana oil in J/molK? Please provide sources.
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i sharted and it smells. can anyone help me with that kbp is?
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You might try
www.mychemistrytutor.com/forums |
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