We need two pieces of information to calculate the reduction of the
vapor pressure of the solvent in a solution containing a nonvolatile
nonelectrolyte:
<span>
<span>The mole fraction of the
nonvolatile solute, Xsolute, in the solution.</span>
<span>The vapor pressure of the
pure solvent, Psolv.</span>
</span>
Psoln = Psolvent (1- Xsolute)
Xsolute = (100g /342.3 g/ mol) / ( 100g
/342.3 g/ mol) + (250 g/ 18 g/ mol)
X solute = 0.0206
P soln = (23.8 mmHg) (1- 0.0206)
Psoln = 23.31 mmg Hg
<span> </span>
Answer:
The correct answer is "8".
Explanation:
The formula to calculate the number of peptides that can be synthesized from a certain number of different amino acids is given as follows:
"n^r"
where "n" is the number of amino acids and "r" is the length of the peptide.
In this case,"n" is 2, since the peptides are synthesized with 2 different amino acids: leucine and histidine; and "r" is 3, since the length of tripeptides is 3 amino acids.
Therefore, the number of distinct tripeptides is given by the formula "2^3", which is "8".
0.00860 km in to scientific notation is 8.60 x10^-3 Km
<em><u>Explanation</u></em>
step for writing scientific notation
- move the decimal place to the right to create a new number from 1 to 10 <em>for example 0.0086 is moved three time to create 8.60</em>
- Determine the exponent that is the number of time you have moved the decimal. <em> </em><em>the exponent for 0.00860 is -3 since the decimal has been moved toward the right</em>
- Put the number into correct form for scientific notation that is <em>8.60 x10^-3</em>
The solution would be like
this for this specific problem:
<span>Zn + 2HCl --> ZnCl2 +
H2 </span><span>
<span>Molar Mass Zinc - 65.38 g/mol </span>
<span>Molar Mass Zinc Chloride - 136.38 g/mol </span>
<span>Number of moles of zinc reacting = 0.600 g / 65.38g/mol =
0.00918 moles 0.00918
moles * 136.38 g/mole = 1.25 g ZnCl2 </span></span>
Answer = 1.25 grams of
zinc chloride
<span>I hope this helps and if you
have any further questions, please don’t hesitate to ask again.</span>
Answer:
See explanation below
Explanation:
This reaction is known as the Grignard reaction. If's often used to add an alkyl to a molecule, in this case, a ketone. This also helps to reduce the carbonile to an alcohol.
The mechanism is taking place in 3 steps.
The first step involves the attack of the pair of electrons of the oxygen from the cyclohexanone to the MgBr, and the other pair takes the propyl.
The second step involves the breaking of this bond to have the OMgBr and the propyl attached to the carbon of the chain.
The last steps involves an hydration of the molecule, to turn the OMgBr into OH, and that would be the final product.
In this case, the final product will be 1-propyl-cyclohexanol.
The picture below, shows the mechanism and the drawing of the final product.