Chemistry Answers

Assume you have a 3.60 m solution that depressed the freezing point of the solution by 0.851 celcius. What is the molal freezing point depression constant (Kf) of the solution?

Mass of CuSO4● XH2O (g) = 1.6 grams BEFORE HEATING

After Heating :

Mass of H2O(g) = 1.1g

Mass of CuSO4 (g) : 0.5

QUESTION:

Use the information to calculate the number of moles of water lost and the number of moles in the anhydrous compound

The reaction 2 NO(g) ↔N₂(g) + O₂(g) has a Kc value of 2400 at 2000 K. If 0.850 M each of N₂ and O₂ are initially present in a 3.00-L vessel, calculate the equilibrium concentrations of N_O, N₂, and O₂.

At 25°c of kcl dissolves in 100cm³ of H2O to give a saturate solution. What's the solubility of this solution

a)g/dm³ of the solvent at this temperature

b)mol/dm³(k=39,cl=35.5)

What is the Volume of the water vapour if 3.2 grams of water vapour is observed at 22 C

and 125 kPa. ?    R = 8.31 L kPa/ K mol 

If you had a stock solution of 15 M sulfuric acid, what should you do if you wanted to make1.0 litre of 5.0 M sulfuric acid from this stock solution?

I need to make 300 mL  a 0.123 mol/L solution of HCl. The only solution of HCl I have in the cupboard is 12.0 mol/L.  How can I make the solution I want?

Explain how you would make 250 mL of a 0.200 mol/L solution of copper sulfate from the 

     solid compound.  (3 marks)

A chemist prepares a sample of hydrogen bromide and finds that it occupies 216 ml at 64 c and 535 torr. what volume would it occupy at0 c at the same pressure? answer in units of ml