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How long (means time) must a 400 W electrical engine work in order to produce 300 kJ of work?
1. What is the boiling point and freezing point of a solution containing 6 g of
glycerol (C3H8O3) in 25 g of water?
2. What is the molecular mass of a solute in a solution containing 3.8 g of
nonelectrolyte in 420 g of water which freezes at -23 oC?
Identify what colligative property is applied or observed in the following. Explain
your answer.
1. Salt is mixed with ice in ice cream making.
2. Salt and sugar are used in food preservation.
3. Coolant is added to car radiators.
4. Pressure cooker.
5. Pruned or wrinkled fingers.
Solve for what is being asked.
What is the molar mass of the solute in a solution made by dissolving 34.41
g of an unknown nonelectrolyte compound in 280.0 g benzene. The boiling point of
the solution is 93.2 °C. Benzene has a boiling point of 80.1 °C and molal boiling-
point elevation constant of 2.53 °C/m.
Solve the given problem.
What is the molality of a solution prepared from 29.22 grams of NaCl in 2.00
kg of water?
Given: mass of solute = 29.22 g
Mass of solvent = 2 kg
Required: m = ?
Solution: m = mole of solute/kg solvent
n = 29.22 g x 1 mol/ 58.44 g
n = 0.5 mol
m = 0.5 mol/ 2 kg
Final Answer: m = 0.25 mol/kg
Given the following equation: 2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O, show what the following molar ratios should be.
The human hemoglobin is a tetrameric protein of about 64.5 KDa, consisting of two α-
chains and two β-chains tightly bound.
a) Calculate the number of amino acids present in the α-chains
b) What is the length of each β-chain?
c) What is the sum of the length of the two α-chains?
d) Find the length of the tetrameric protein hemoglobin assuming its all an alpha
The human hemoglobin is a tetrameric protein of about 64.5 KDa, consisting of two α-
chains and two β-chains tightly bound.
a) Calculate the number of amino acids present in the α-chains
b) What is the length of each β-chain?
c) What is the sum of the length of the two α-chains?
d) Find the length of the tetrameric protein hemoglobin assuming its all an alpha
The force between a 100 kg man and the Earth is 980 N. How close must two protons (1.6 X 10-19 C) be to generate the same force?
explain the importance of using a range of accurate design reference materials when developing design proposals
