Chemistry Answers

A beaker contains 45.5 mL of carbon tetrachloride (CCl4, density is 1.59 g/mL).

Determine how many molecules of carbon tetrachloride are in the beaker.

A solution is made of 

- 1 mmol of non-volatile solute A

- 2 mmol of non-volatile solute B

- 3 mmol of non-volatile solute C

- 4 mmol of non-volatile solute D

- 0.990 mol of solvent.

Assume that the solvent is water, what is the vapor pressure of this solution at the normal boiling point of water?

A solution is made of 

- 1 mmol of non-volatile solute A

- 2 mmol of non-volatile solute B

- 3 mmol of non-volatile solute C

- 4 mmol of non-volatile solute D

- 0.990 mol of solvent.

Assume that the solvent is water, what is the vapor pressure of this solution at the normal boiling point of water?

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Answer the following question and identify the property of water that explains why:

1. There is a large drop in temperature during evaporation.

chloroform (CHCl3) is a known aesthetic. it is also used to produce the refrigerant carbon tetrachloride (CCl4) according to the reaction: CHCl3 (g) + Cl2 (g) CCl4 (g) + HCl (g)

write the law expression for the reaction. calculate the rate constant

The standard enthalpy changes for the formation of aluminium oxide and iron (III) oxide are:

2 Al(s) + 3/2 O2 (g) Al203(s) ∆H= -1676 kJ/mol

2 Fe (s) + 3/2 O2 (g) Fe2O3 (s) ∆H= -824 kJ/mol

It took 2 mins.15 sec for a volume of chlorine to effuse through a pinhole. How long will it take the same volume of water vapour to effuse through the same hole under the same condition of temperature and pressure?

Use the octet rule to predict the formula of the compound that would form between arsenic and iodine , if the molecule contains only one arsenic atom and only single bonds are formed.  Formula:

If a 25 ppm Nitrogen dioxide in the air contains 25 mg of the compound in every liter of solution. How many milligrams are contained in 2.5 L sample of the air?

Weak interactions in aqueous solution state and explain 7 points