Answer:
2.68g
Explanation:
Given parameters:
Volume of gas at STP = 2.15L
Unkown:
Mass of Nitrogen N₂ gas at STP = ?
Solution
To find the mass of the gas at STP, we use the mole concept approach.
In using the mole approach we follow the following procedures:
1. Find the number of moles of gas at STP using the relationship below:
Number of moles = 
Note: 1L = 1dm³
2. Then using the mole and mass relationship, we can find the mass of the gas using the equation below:
Mass = number of moles x molar mass
Workings
1. Number of moles of N₂ = 
Number of moles of N₂ = 0.096mole
2. Given that the atomic mass of N = 14g
Molar mass of N₂ = 2 x 14 = 28gmol⁻¹
Mass = 0.096mol x 28gmol⁻¹ = 2.68g
Cystine is dimer of Cystein amino acid formed by oxidation reaction. Its main function is to provide mechanical strength to proteins and allow them to retain their 3-D structures and also serves as a substrate for the cystine-glutamate antiporter.
As shown in figure cystine has two amino groups (highlighted blue) and two carboxylic groups (highlighted green). In its original structure cystine is neutral in nature as it has equal number of basic (NH₂) and acidic (COOH) moieties along with two chiral centers (asymmetric carbons) highlighted with red spots.
When one -NH₂ group is replaced by -COOH group the cystine is converted into an acidic compound with three COOH groups and a NH₂ group. Also, one asymmetric carbon will convert into a symmetrical carbon with a loss of one chiral carbon.
In second step, when another NH₂ is replaced by COOH, the acidic strength of resulting compound will increase along with conversion of last chiral carbon into symmetric carbon.
Therefore, the final structure will be acidic in nature with zero chiral carbons as shown in figure attached below.
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They create salt when put together
