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Question 1: 25.0 g of sodium hydroxide is dissolved in 150.0g of water. What's % (mass/mass) concentration of this solution
Question 2: A 250.0 mL solution of hydrochloric acid has a concentration of 0.125 mol/L. How much water must be added to the solution to obtain a concentration of 0.100 mol/L?
Question 3: How evaporation of a liquid in terms of kinetic molecular theory.
The combustion of butane can be represented by the following equation:__C4H10 (g) + __O2(g) ? __CO2(g) + __H2O(g)
Chemists often use molarity ,M in Moles/liter , to measure the concentration of solutions. Molarity is a common unit of concentration because the volume of a liquid is very easy to measure
How many joules of heat are required to raise the temperature of 750 g of water from 11.0 oC to 19.0 oC?
estimate the mean ionic activity coefficient for nacl in a solution that is 0.020 molkg naclaq and 0.035 molkg cano32
What is the pH if 2.0 g of Ca(OH) 2 are added to 1.0 liter of stomach solution with a pH=1.0 ?
a previously evacuated tank with a capacity of .1m3 is pressurized with 1kg each of heliummolar mass 4.0 and
What is the heat output of each sample? (b) One serving of each cereal is 30.0 g. How would you label the packages of the two cereals to indicate the fuel value per 30.0-g servings in joules? in nutritional calories (kilocalories)
How many grams of sucrose must be added to 552g of water to give a solution with a vapor pressure 2.o mmHg less than that of pure water at 20 celsius?
Problem- A solution is prepared by dissolving 125 g sucrose (C12H22O11) in 135 g H2O. Calculate the mass % of sucrose in the solution.
Iodine-131 has a half-life of 8.0 days. If a person ingests 2.5 mg of NaI labeled with iodine-131, how much of the radioactive isotope remains in the body after 30. days
Which of the following is a use for nuclear energy?
Carry out the following mathematical operations, and give each result with the correct number of significant figures. (1.05 x10-3)/ (6.135 )
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