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Chem
Questions (41)
Which one of these statment are true?
1. most of the mass of an atom is in the electron cloud. 2. A proton has a charge of 1+. 3.
1 answer
270 views
Debbie’s age is 40% of her father’s age. Ten years ago from now, Debbie’s age will be 50% of her father’s age. How old
1 answer
569 views
Connie is 15 years younger than Linda. When Connie got married, she was two-third of Linda’s age. How old was Connie when she
1 answer
643 views
Calculate the temperature found when 10kg of water at 1008C is mixed with 20kg of water at 40C
1 answer
401 views
In Daniell's element, where you have ZnSO4 and CuSO4 in respective half-cells, with a saltbridge of Na2SO4, do the sulfate ions
1 answer
520 views
How many molecules are contained in a 7.60-g sample of dimethylmercury?
4 answers
1,876 views
From the molecular equation find the overall ionic and net ionic:
Molecular: H3PO4 (aq) + 3NaOH (aq) --> Na3PO4 (aq) + 3H2O (l)
1 answer
3,393 views
If we were to fill a bottle with boiling hot water than place it in a bucket filled with cold water what would happen to the
1 answer
754 views
What is the molarity of the final solution if 2.00mL of the 5.00 M stock solution is diluted to 10.00mL to make solution A?
1 answer
1,136 views
When performing an extraction, is it better to have a higher or lower K (distribution coeffictient/ partition coefficient)
0 answers
445 views
Nylon 88 is made from the monomers H2N(CH2)8NH2 and HOOC(CH2)6COOH. So, would you characterize nylon 88 as rather an addition or
1 answer
2,644 views
A hot air balloon is filled with hot air and the hot air forces the volume of the balloon to expand until the density of the gas
1 answer
771 views
Use your balanced equation to calculate the volume of 0.12 M Na3PO4 to stoichiometrically react with the 3.0 mL of Co (NO3)2.
1 answer
697 views
Procedure
0) The sodium phosphate, Na3PO4 solution has NPFA ratings of 1 (out of 4) for health, 0 for fire, and 0 for reactivity.
1 answer
873 views
Discuss how your supernatant color in the 6 different test tubes supports your calculated result in #2. For example, if you used
2 answers
771 views
What volume of eugenol will be present in 30 mL of distillate?
The essential oil found in cloves, eugenol, can be isolated by
1 answer
3,977 views
carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constanst (K) for this reaction
0 answers
1,318 views
When weighing liquid ethanol, why do you have to place water in the beaker prior to adding the ethanol to that same beaker?
2 answers
555 views
What is the pH of a 0.20 M HF solution that is 5.8% ionized at 25 Celsius ?
A.4.45 b.0.70 C.1.93 D.1.23 E.1.40
1 answer
758 views
Using the "octet rule" write the Lewis formulas for NF3 and NO3-.
1 answer
727 views
How do you draw a lewis dot structure of s3o
1 answer
620 views
In the laboratory exercise "Preperation and Properties of Polymers", polyvinyl alcohol is dissolved in water and then reacted
0 answers
496 views
True/False
1. Diatomic molecules contain two atoms?T 2. Electrons travel in pairs? T 3. The energies needed to break chemical
1 answer
1,475 views
Sucrose hydrolyzes into glucose and fructose. The hydrolysis is a first order reaction. the half life for the hydrolysis of
4 answers
1,877 views
At 2273K, equilibrium constant for the reaction
2NO(g)<->N2(g)+O2(g) Kc=2.4x10^3 What would be equilibrim concentration of N2, if
9 answers
824 views
what would Qc be if the pressure of the container decreased by a factor of 2.417 for the following reaction?
4Hcl(g)+O2(g)<-->2Cl
2 answers
1,081 views
what is the free energy change in kJ for the reaction below?
2NO3-(aq)+8H+(aq)+3Hg(l) <-->2NO(g)+4H2O(l)+3Hg2+(aq) E0=0.106V
0 answers
609 views
what is the pK (=-logK)at 25C for the reaction below?
Cl2(g)+6H2O(l)+5Cu2+(aq)<-->2ClO3-(aq)+12H+(aq)+5Cu(s) E0=-1.133V
10 answers
1,092 views
if the voltage of the cell is 2.0898V at 25C when [Mg2+] = 0.1945M and the pressure of H2 = 1.00atm, what is the pH? E0=2.3700V
M
1 answer
566 views
what must be the current in amperes to plate out 7.437g of Al from am aqueous solution of Al3+ in 5.4x10^2 minutes?
1 answer
604 views
How much energy in kJ is realeased to form one mole of Cd 116(isotope) from protons and neutrons if the atom has a mass of
1 answer
466 views
what would the freezing point be for a solution of 0.87M aqueous ammonia? The density of this solution is 0.992g/cm3
1 answer
502 views
If [K+] inside a cell is 25 times greater than a [K+] outside the cell, what is the difference in potential between the two
1 answer
1,010 views
What mass of CsBr must be added to .500L of water to produce .4molality solution? What are mole fraction and mass percent?
Here
0 answers
1,120 views
How many grams of water would it take to quench 1 g of phenylmagnesium bromide?
2 answers
1,108 views
1) How many drops of 12M HCl would you add to 1.00 L of 0.100 M HC2H3O2 to make [C2H3O2-] = 1.0 x 10^-4 M? Assume that 1 drop =
3 answers
1,757 views
What mass of Al can be deposited by the passage of a constant current of 5.00 A through a Al(NO3)2 solution of 2.00 hours?
My
3 answers
1,780 views
complete and balance the following decompition equations
CaCO (heated) --> 3 please tell me how to do this and what exactly is
3 answers
747 views
How many atoms are there in 6.90 moles of sulfur (S)?
Calculate the molar mass of a compound if 0.411 mole of it has a mass of
2 answers
1,797 views
N2 + 3H2 --> 2NH3
At 25°C (delta)Ho = -92.22 kJ and (delta)So = -198.53 J/K. Using this information, calculate the equilibrium
1 answer
1,509 views
Calculate the heat of reaction for the incomplete combustion of 67.0g propane producing carbon monoxide gas and water vapour.
how
0 answers
780 views
Answers (26)
100.016 or 1.00 x 10^2 kj/mol
q = 3.4 x 334 J/g
To find the volume of a HCP structure given the height and the lenght, you should use this formula: l^2*h*((3)^1/3)/2)
Where Co(NO3)_2 is the limiting reagent the mmoles of the precipitate will be related to the mmoles of Co(NO3)_2 originally present by the balanced stoich. and the filtrate will be colorless? And if Na_3PO_4 is the limiting reagent the filtrate will be
Procedure 0) The sodium phosphate, Na3PO4 solution has NPFA ratings of 1 (out of 4) for health, 0 for fire, and 0 for reactivity. Cobalt (II) nitrate has 2 for health, 0 fire, and 0 for reactivity. 1) Carefully label (1-‐6) and weigh 6 small test
11.76
C6H12 = 6x12 + 6x1 = 78. The equation indicates that 2x78 = 156g benzene will produce 6542kJ. Using proportions you can then calculate that x/6542kJ = 8.1g / 156g x = 339.7kJ = 339700J. heat = mass x ΔT x 4.18J/g° ΔT = 339700J / (5691g x 4.18J/g°) =
What are answers of a) and b) ??
Image one (d) Image two (a) I hope this helps. :)
I don't understand how you do (b), I got 173kJ for (a) and I understand Hess's law for (c), but (b) I really don't understand (b)
ln166.44-lnx=0.64766*1.73 -lnx=1.120-ln166.44 lnx=3.9942 x=E^3.9942 =54.27 166.54-54.27=112g
Thank you for you help
that works! thank you so much!!
yes, I figured that one out. Thanks so much for the help!
yes, it wants an actual value
2NO N2 O2 initial .116 0 0 change -x +x +x equil .116-x x x
yes I did, but im still not getting the right answer. I got .1136 which is not the correct answer.
i tried that, apparently its not the right answer either =/.
with n=10, im getting an answer of 0 when I do e^(k) i got lnK= (10)(96485)(-1.133)/(8.314)(298) lnK=-441.228 e^(-441.228)=0
what is "n" and thank you so much for all the help!
E cell is not given, just the E0 cell which is -1.133V
i m getting 9.77 g for Bi2S3 . no limiting reactant .. both are same .. can u plz conform
Can you repost #1 please. Thanks.
I'm sorry I made a typo it goes through a solution of Al(NO3)3 and that's why I mutliplied the m.w. of Al by 3 because you have 3 moles of Al per NO3
so wat do i do?
E is NOT NOT NOT THE ANSWER!!!!
