General Chemistry Answers

How many molecules are there in 0.08 mole of urea?

How many mL of 0.250 M HCI would react exactly with 30.0 mL of the 0.150 M solution of Ca(OH)2 solution? The chemical reaction involved is:

HC1(aq) + NaOH(aq) → NaCl(aq) + H2O (1)

Are the values of Kf and Kb dependent on the identify of the solvent, the solute, or both? Explain

12.755 g of a metal initially at 99.0 c are placed into 75.0g of water initially at 23 c the final temperature of the water is 24.5 c calculate the specific heat of the metal the specific heat of water is 4.184 J/g c

How many grams of solute is present in 0.4 moles Magnesium hydroxide, Mg(OH)₂ in 550 g water, H₂O? The molar mass of Mg(OH), is 58 g/mol.

.A solution prepared by adding 10g of an unknown non-volatile, non-electrolyte solute to 150 g of water. The Boiling point of the solution is elevated by 0.433 0C above the normal boiling point of the solvent. What is the molar mass of the unknown substance?

How many mL of the titrant Sr(OH)₂ is needed to titrate 4.31 mL of 0.75 M HClO₄, if the molarity of the titrant is 0.65 M?

Study carefully each of the item and do what is

asked.

1. List the types of intermolecular forces that exist between molecules in each of

the following species: (a) benzene (C6H6), (b) CH3Cl, (c) PF3, (d) NaCl, (e) CS2.

2. Which of the following can form hydrogen bonds with water? CH3OCH3, CH4,

F,HCOOH, Na+

3. Which of the following species are capable of hydrogen-bonding among

themselves? (a) C2H6, (b) HI, (c) KF, (d) BeH2, (e) CH3COOH

4. Arrange the following in order of increasing boiling point: RbF, CO2, CH3OH,

CH3Br.

5. Which member of each of the following pairs of substances would you expect

to have a higher boiling point? (a) O2 and Cl2, (b) SO2 and CO2, (c) HF and HI

At 50°C, the vapor pressure of ethanol is 0.30 atm, acetic acid

is 0.08 atm, water is 0.12 atm, and acetone is 0.84 atm. Arrange these substances in

order of increasing manner:

1. rates of evaporation.

2. boiling point temperature.

3. vapor pressure.

4. viscosity.

5. intermolecular forces.

Using conversion method. Calculate the molality and molarity of aqueous phosphoric acid solution 1.88 g/ml containing 20% by mass of H3PO4