Chemistry Answers

What is the volume of a sample of ethane at 467k and 1.1atm ,if it occupies 405ml at 298k and 1.1atm

Use electronic and stability factors to account for the acidity of each hydrogen in

the m-hydroxybenzoic acid. Identify the most acidic proton.

1. How much energy is required to change 2600 gram of water at 100˚C into steam at the same temperature?

2.Calculate the amount of energy (in kJ) needed to heat 346 gram of liquid water from 0 OC to 182 OC. Assume that the

specific heat of water is 4.184 J/g OC over the entire liquid range and the specific heat of steam is 1.99 J/g OC.

3.Calculate the heat released when 68.0 gram of steam at 124 OC is converted to water at 45 OC

How much energy is required to change 2600 gram of ice at 0˚C into water at the same temperature?

Camphor is a white solid that melts at 179.5°C. It has been used to determine the molecular weights of organic compounds because of its unusually large freezing-point-depression constant (40°C/m), which allows ordinary thermometers to be used. The organic substance is dissolved in melted camphor, and then the melting point of the solution is determined.

Calculate the molality of each of the following solutions

a)    14.3 g of sucrose in 676 g of water

b)    7.20 moles of ethylene glycol (C₂H₆O₂) in 354 g of water

Calculate the percent by mass of the solution in each of the following aqueous solutions.

a)    5.50 g of NaBr in 78.2 g of solution

b)    31.0 g of KCl in 152g of water

c)    4.5g of toluene in 29g of benzene

1. Calculate the molality of a sulfuric acid solution containing 23.2g of sulfuric acid in 192g of water. The molar mass of sulfuric acid is 98.08 g.
2.  What is the molality of a solution containing 8.82 g of Urea (NH₂)₂CO in 216g of water.
3. A sample of 5.42 g of naphthalene is dissolved in 79.8g of benzene (C₆H₆). Calculate the percent by mass of naphthalene in the solution.
4. Calculate the molality of a 34.6 percent (by mass) aqueous solution of sodium chloride.

Complete the following for aqueous solutions of Aluminum nitrate. Show Complete Solution.

1. Mass of Solute= 2.544g, Molarity= 1.688M, Volume of Solution=____
2. Mass of Solute= _____, Molarity= 0.729M, Volume of Solution= 894mL

How many grams of NaOH are in 3 liters of a 1M solution of the NaOH?