Answer:
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Answer:
Molarity → 0.17 M
Molality → 0.11 m
Explanation:
The student notices that the volume of the solvent does not change when the sucrose dissolves in it; therefore we assume the volume of solvent as solution.
Molarity = Mol of solute/L
Let's calculate the mol of solute (mass / molar mass)
12 g / 342 g/mol = 0.0351 moles
Let's conver the volume (mL) to L
300 mL / 1000 = 0.3 L
Molarity (mol/L) = 0.0351 mol / 0.3L → 0.17 M
Molality = mol of solute / 1kg of solvent.
Let's find out the mass of solvent with the density
Solvent density = Solvent mass / Solvent volume
1.01 g/mL = Solvent mass / 300 mL
1.01 g/mL . 300 mL = Solvent mass →303 g
Let's convert the mass to kg
303 g / 1000 = 0.303 kg
Molality (mol/kg) → 0.0351 mol / 0.303kg = 0.11 m
Answer:
pH = 11.7
Explanation:
pOH= -log [OH]=-log[0.05]
=2.3
pOH+pH= 14
pH= 14-2.3= 11.7
Explanation :
Zwitter ion : An ion or molecule having separate negatively and positively charged groups.
Methionine is an amino acid with sulfur atom in its molecule .The proton from carboxylic group with get attached to amino group present in the methionine and negative charge will be generated on oxygen atom of a carboxylic group which will get in conjugation with an another oxygen atom of the carboxylic group.
The positive charge will generated on the nitrogen atom due attachment of the proton from the carboxylic group.
As shown in the image attached.
Answer:
nitrogen 18
nitrogen has an atomic number of 7
Answer:
c. an element.
Explanation:
An element -
It refers to the substance , which has same type of atoms , with exactly same number of protons , is referred to as an element .
In term of chemical species , elements are the smallest one , and can not be bifurcated down to any further small substance by the means of any chemical reaction .
Hence , from the given information of the question ,
The correct term is an element .
Answer:
C. an element.
Explanation: