General Chemistry Answers

The mango pulp is being heated in Food Processing Lab. Of PMAS- Arid Agriculture University in a stainless-steel container (1.8’ deep, 2’ long and 1’ wide container) at 80 °C. The pulp was initially at room temperature. Calculate the mango pulp temperature after 5 min and 10 min of heating. The convective heat-transfer coefficient of container is 4 kW/(m2 °C). Use appropriate values where necessary. What would be the effect on temperature after 5min and 10 min if the depth of the container reduces to 1’.

5. Lead is a poisonous metal that especially affects children because they retain a larger fraction of lead than adults do. Lead levels of 0.250ppm in a child cause delayed cognitive development. How many moles of lead present in 1.00g of child’s blood would 0.250ppm 

represent.

6. Acetone, C3H6, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone (d=0.790g/mL) to 50.0mL of ethyl alcohol, C2H6O 

(d=0.789g/mL). Assuming volumes are additive, calculate 

(a) the mass percent of acetone in the solution.

 (b) the volume percent of ethyl alcohol in the solution. 

(c) the mole fraction of acetone in the solution.

1. Suppose you added 4.0 moles of sugar to 10.0 L of solution. Calculate the molar concentration of the solution. 

2. A sample of water taken from a nearby lake is found to have 0.0035 mol of salt in a 100mL 

solution. Determine the molar concentration of the solution in the lake. 

3. You dissolve 30.0g of sodium sulfate (Na2SO4(s)) into 300mL of water. Calculate the molar 

concentration of the solution. 

4. What is the Molality of a solution containing 7.78g of Urea [(NH2)2CO2] in 203g of water? 

What is the pH of a 2.4x10^-4 M NH₃ solution? (K_b = 1.8x10^-5 )

What is the pH solution containing 0.30 M HCOOH and 0.52 M HCOOK?

HCOOH_(aq) + H₂O_(l) = H₃O⁺_(aq) + HCOO^-_(aq)

How many kilograms of strontium nitrate would I need to make 52.1 liters of a 0.750 M solution? 

1.20g Sb reacts with 2.40g of I 2 :

molar mass of CO2

  Research an experiment that explains how changing the ratio of hydrogen : air effects the loudness of the sound.

1. State the effect that dissolving a solute has on each of the following physical properties of a solvent.

a. Boiling Point

b. Freezing Point

2. Explain why the colligative properties of a solvent are affected more by the dissolving of an electrolyte compared to an equal amount of a nonelectrolyte.

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