Answer: The freezing-point depression constant (Kf) of nitrobenzene is
Explanation:
Depression in freezing point is given by:
= Depression in freezing point
i= vant hoff factor = 1 (for non electrolyte nitrobenzene)
= freezing point constant = ?
m= molality
Weight of solvent = 20 g = 0.02 kg
mass of solute (ethanol) = 1.0 g
Molar mass of ethanol = 46 g/mol
Thus freezing-point depression constant (Kf) of nitrobenzene is
Answer:
The partial pressure of when the valve is opened is 328.6 Torr.
Explanation:
Initial pressure of the
Initial volume of the
After opening the valve :
Final pressure or partail pressure of the
Final volume of the
( Boyle's law)
The partial pressure of when the valve is opened is 328.6 Torr.
Answer:
Mass of liquid unknown liquid = 10.4 g
Explanation:
Volume of liquid = 15 mL
Mass of liquid + graduated cylinder = 55.2 g
Mass of graduated cylinder = 44.8 g
Mass of unknown liquid = ?
Solution:
Mass of unknown liquid is calculated by subtracting the graduated cylinder mass from combined mass of liquid and graduated cylinder.
Mass of liquid = (Mass of liquid + graduated cylinder) - (Mass of graduated cylinder )
Mass of liquid = 55.2 g - 44.8 g
Mass of liquid = 10.4 g
So the mass of unknown liquid is 10.4 g.
Answer:
A
Explanation:
The solubility of a substance is directly proportional to the temperature. It means that solubility will increase with the increases in temperature. At higher temperature, the kinetic energy increased that allow the solvent molecules to break the solute particles more effectively.
Substance A has a higher solubility because the weight of substance A measured at the end of the experiment is less than the weight of substance B.
Hence, the correct answer is A.
Out of the following given choices;
A. O-linked; serine
B. O-linked; asparagine
C. O-linked; threonine
D. N-linked; glutamine
E. N-linked; asparagine
The answer is B. O-Linked referred to type of glycosylation of the proteins. This type of glycosylation involves attachment of a monosaccharide or an oligosaccharide molecule to an oxygen atom in an amino acid residue of proteins. While N-linked glycosylation is an attachment of an oligosaccharide molecule to an amide nitrogen atom of arginine or asparagine of proteins. Glycosylation (a post-transcriptional modification) is a bond formed from donor of a glycosyl group (usually a carbohydrate ) and a glycosyl acceptor. This occurs in the constant domains of antibodies such as IgG.