Chemistry Forum

No number of the given results fullfill the value of 76.72 °C

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.

I would say its solution B 5. For 1 ml Goldsol 5 mg Protection colloid is needed.
Its 5 mg/ 1ml

Correct.

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.

What is C5O2H8. Write Name or Strukturen formula. So it can be hundreds of compounds.

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.

Why do you mix kJ and kcal, it is the same thing only different unit.

Correct.

You have to express the MnO2 in first equation with the second equation .

Its like 1/2 + 1/3 = ?

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.

The unit of heat released is kJ/ mol. So what is the maximum mol what react according NaOH + HCl => NaCl + H2O ?

You calculate for 4C + 6H2 => 2 C2H6 -167 kJ/mol

But you can devide to 2C + 3H2 => C2H6 -83,55kJ/ mol ~ - 84 kJ/ mol

Explain why should Li+ and Mg 2+ have more electrons as protons?
Of course 1b iscorrect.

1 d is wrong, the others are correct.