Answer:
8×10^(-3) mol/L
Explanation:
The formula for finding the hydrogen ion concentration is...
[H⁺] = 10^-ph
[H⁺] = 10^(-2.1)
[H⁺] = 0.00794...mol/L = 8×10^(-3) mol/L
The answer is to 1 significant digit because the pH has one decimal place.
Answer:
P = 0.0373 atm
Explanation:
Given data:
Mass of krypton = 1.86 g
Volume of krypton = 17.5 L
Temperature of krypton = 190 F
Pressure of krypton = ?
Solution:
First of all we will calculate the number of moles.
Number of moles = mass/ molar mass
Number of moles = 1.86 g/ 83.9 g/mol
Number of moles = 0.022 mol
Formula:
PV = nRT
P = nRT / V
P = 0.022 mol × 0.0821 atm. L. mol⁻¹. K⁻¹ × 360.928 K / 17.5 L
P = 0.652 atm. L /17.5 L
P = 0.0373 atm
If fluorine is stronger than carbon, fluorine will receive a negative charge.
<h3>WHAT IS THE ELECTRONEGATIVITY SERIES?</h3>
The electronegativity series is the order in which elements of the periodic table are ranked in terms of their negative charges.
Elements with higher electron affinity are positioned higher in the series. According to this question, fluorine is stronger than carbon.
This means that fluorine will receive a negative charge (-) to become more electronegative.
Learn more about electronegativity series at: brainly.com/question/2060520
Answer: The charge on peptide chain lys-lys-his-glu at pH 7 is +1.
Explanation: A peptide chain is the chain formed from the condensation of two amino acids releasing 
molecule and forming N-terminal(Nitrogen- end) and C-terminal(Carboxyl-end). The bonds formed are known as peptide bonds.
Here 4 amino acids join together forming a peptide chain
In this peptide chain N-terminal is from lysine (lys) and C-terminal is from Glutamic acid (Glu).
At pH=7,
- The carboxyl (-COOH) groups will be deprotonated that means they will not have H-atoms and have (-1) charge.
- The Amino (
) groups will be protonated that means they have H-atoms and have (+1) charge.
So, there are 3 amino groups present each having (+1) charge and 2 carboxyl groups each having (-1) charge.
Total charge on peptide chain = 
= +1
