Your answer is correct.
The error is in 2/40 * 1000/250
It has time be 0,2/40 * 1000/250
Search found 1565 matches
- Sat Sep 04, 2021 11:12 am
- Forum: Chemistry forum
- Topic: Normality of a solution
- Replies: 1
- Views: 3442
- Thu Sep 02, 2021 9:57 am
- Forum: Chemistry forum
- Topic: normal boiling point
- Replies: 2
- Views: 3568
Re: normal boiling point
No number of the given results fullfill the value of 76.72 °C
- Wed Sep 01, 2021 9:43 pm
- Forum: Chemistry forum
- Topic: Molecular Formula
- Replies: 2
- Views: 3760
Re: Molecular Formula
Use n= m/M, solve to M to get molecular weight.
This calculate with the given percentage.
Divide each result through the molecular mass of the elements.
This calculate with the given percentage.
Divide each result through the molecular mass of the elements.
- Wed Sep 01, 2021 10:22 am
- Forum: Chemistry forum
- Topic: What is gold number here?
- Replies: 4
- Views: 6009
Re: What is gold number here?
I would say its solution B 5. For 1 ml Goldsol 5 mg Protection colloid is needed.
Its 5 mg/ 1ml
Its 5 mg/ 1ml
- Tue Aug 31, 2021 11:59 am
- Forum: Chemistry forum
- Topic: Questions of thermodynamics
- Replies: 2
- Views: 3522
Re: Questions of thermodynamics
Correct.
- Mon Aug 30, 2021 5:38 am
- Forum: Chemistry forum
- Topic: What are the reaction products of this substance?? please help!
- Replies: 3
- Views: 3810
Re: What are the reaction products of this substance?? please help!
With Ammoniumperchlorate you will get oxidation of the Polymer, but products unknown, if everything runs well CO2, N2, HCl and water, Boron and Lithiumflourid have no influence.
- Mon Aug 30, 2021 3:26 am
- Forum: Chemistry forum
- Topic: What are the reaction products of this substance?? please help!
- Replies: 3
- Views: 3810
Re: What are the reaction products of this substance?? please help!
What is C5O2H8. Write Name or Strukturen formula. So it can be hundreds of compounds.
- Sat Aug 28, 2021 9:05 am
- Forum: Chemistry forum
- Topic: Final temperature
- Replies: 4
- Views: 4231
Re: Final temperature
But the Value is given
Specific heat capacity of water is 4.19 J/(g*K)
Like the one of the human body 3.77 J/(g*K)
No need to calculate with cal.
Specific heat capacity of water is 4.19 J/(g*K)
Like the one of the human body 3.77 J/(g*K)
No need to calculate with cal.
- Sat Aug 28, 2021 7:49 am
- Forum: Chemistry forum
- Topic: Final temperature
- Replies: 4
- Views: 4231
Re: Final temperature
Why do you mix kJ and kcal, it is the same thing only different unit.
- Fri Aug 27, 2021 11:18 am
- Forum: Chemistry forum
- Topic: calculation of neutralization heat
- Replies: 8
- Views: 8570
- Fri Aug 27, 2021 10:41 am
- Forum: Chemistry forum
- Topic: Help
- Replies: 3
- Views: 3776
Re: Help
You have to express the MnO2 in first equation with the second equation .
Its like 1/2 + 1/3 = ?
Its like 1/2 + 1/3 = ?
- Fri Aug 27, 2021 10:37 am
- Forum: Chemistry forum
- Topic: calculation of neutralization heat
- Replies: 8
- Views: 8570
Re: calculation of neutralization heat
You have to calculate how much mol you have with the datas given. Do you you have 1:1 or something else. But you have to get the ratio 1:1.
- Fri Aug 27, 2021 7:53 am
- Forum: Chemistry forum
- Topic: calculation of neutralization heat
- Replies: 8
- Views: 8570
Re: calculation of neutralization heat
The unit of heat released is kJ/ mol. So what is the maximum mol what react according NaOH + HCl => NaCl + H2O ?
- Tue Aug 24, 2021 4:12 am
- Forum: Chemistry forum
- Topic: Calculation of standard molar enthalpy of formation
- Replies: 2
- Views: 3517
Re: Calculation of standard molar enthalpy of formation
You calculate for 4C + 6H2 => 2 C2H6 -167 kJ/mol
But you can devide to 2C + 3H2 => C2H6 -83,55kJ/ mol ~ - 84 kJ/ mol
But you can devide to 2C + 3H2 => C2H6 -83,55kJ/ mol ~ - 84 kJ/ mol
- Tue Aug 24, 2021 1:40 am
- Forum: Chemistry forum
- Topic: Questions on chemical structures of compound or elements
- Replies: 3
- Views: 4258
Re: Questions on chemical structures of compound or elements
Explain why should Li+ and Mg 2+ have more electrons as protons?
Of course 1b iscorrect.
Of course 1b iscorrect.