Blog

Aspartame (C14H18N2O5) is a sweetener used in diet sodas. What is the mole fraction of aspartame if 84.2 g is added to 125 g of water?

Below shows an image of methylamine dissolved in water and the interactions that occur. Which of the following arrows point to a hydrogen bond?    

Which of the following solutions will have the lowest vapor pressure?

Determine the signs ΔH, ΔS, and ΔG for an ionic compound that dissolves in water. The temperature of pure water is 26.9 oC. After the salt was added the temperature of the solution is 23.4 o     ΔH ΔS ΔG A + + + B – – 0 C – + – D + + – E + – +

Determine the signs ΔH, ΔS, and ΔG for an ionic compound that dissolves in water. The temperature of pure water is 26.9 oC. After the salt was added the temperature of the solution is 21.3 o   Table of Choices   ΔH ΔS ΔG A + + – B – – 0 C – + – D + + + E + – +

Pure ethanol has a freezing point of -114.0 oC. A solution of MgCl2 is made by adding 28.90 g of MgCl2 to 3.600 kg of ethanol.  Given the freezing point depression constant (Kf) of ethanol, 1.99 oC/m, what is the freezing point of the solution? 

In an experiment, 20.00 g of unknown non-electrolyte is dissolved into 250 mL of pure water and the solution has a new boiling point of 102.75o Determine the molar mass of the compound if the Kb of water is 0.512oC/m. (The density of water is 1.00 g/mL).

Which of the following is more soluble in liquid water CH3COCH3  CH2Cl2 Because 3. It is polar and therefore the strongest interactions formed are dipole-dipole interactions with water. 4. It is polar and can form hydrogen bonding interactions, therefore the strongest interactions formed are hydrogen bonding interactions with water  5. It is nonpolar and therefore the strongest interactions formed with water are LDFs.

The rate law for a hypothetical reaction was determined to be Rate=k[X]2[Z]1/2. What happens to the rate when X is tripled (3x) and Z is quadrupled (4x)?

Which of the following ideals represented an American innovation in nineteenth-century Atlantic intellectual trends?