Answer:
Number of moles of C₂H₂ = 13.3 mol
Number of moles of Co = 0.92 mol
Explanation:
Given data:
Number of molecules of C₂H₂ = 7.98 ×10²⁴
Number of moles of C₂H₂ = ?
Mass of Co = 25.8 g
Number of moles of Co = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For C₂H₂:
1 mol = 6.022 × 10²³ molecules
7.98 ×10²⁴ molecules × 1 mol / 6.022 × 10²³ molecules
1.33×10¹ mol
13.3 mol
For Co:
Number of moles = mass/ molar mass
Number of moles = 25.8 g/ 28 g/mol
Number of moles = 0.92 mol
Answer
The components of the r group of amino acid structure varies among different amino acids
Explanation
As the functional group for amino acids is as:
R-CH-COOH
I
NH2
only R differs so amino acids also differs. If R is “H” then amino acid is glycine and if R is “CH3” then amino acid is alanine. Hence, R is different for different amino acids. Other components as alpha carbon ( C ), carboxyl group ( COOH ) and amino group ( NH2 ) is fixed for every amino acid.
Answer:
Incomplete precipitation of barium sulfate
Explanation:
The student has precipitated and digested the barium sulfate on his/her side. But on the addition of in the solution, the solution become cloudy. This happened because incomplete precipitation of barium sulfate by the student. When is added, there are still sulfate ions present in the solution with combines with and forms and the formation of this precipitate makes the solution cloudy.