Answer:
2. At pH near the pI, nearly all the molecules carry no net charge
Explanation:
The general equilibrium for a molecule with multiple ionizable groups could be:
H₃A⁺ ⇄ H₂A + H⁺ ⇄HA⁻ + H⁺⇄A²⁻ + H⁺
<em>Where each equilibrium has its own pKa</em>
The equilibriums in which H₂A are involved (The neutral molecule), are used to determine the isoelectrical point.
The isoelectrical point is defined as the value of pH in which the molecule has no net charge.
Thus, true option is:
<h3>2. At pH near the pI, nearly all the molecules carry no net charge</h3>
Answer:
A. 1.50 M
Explanation:
Concentration is the number of moles of solute dissolved in a volume of 1 L of solution
Mass of LiBr - 97.7 g
Number of moles of LiBr - 97.7 g /87 g/mol = 1.12 mol
Equation for concentration is as follows
Concentration = number of moles / volume of solution in L
Substituting the values
Concentration = 1.12 mol / 0.7500 L
Concentration of LiBr is 1.50 mol/L
Well, the molar mass of acetone would be
3(12.011)+6(1.008)+15.999 , which cleans up to be 58.08 grams.
out of this total, 3(12.011), or 36.033 grams are carbon
So, to find the percent, you do part over whole
36.033/58.08, which equals 0.6204 with significant figures
multiply that by 100 to get 62.04%
Hope that helps!
Answer:
radio telescope
Explanation:
We use radio telescopes to study naturally occurring radio light from stars, galaxies, black holes, and other astronomical objects. We can also use them to transmit and reflect radio light off of planetary bodies in our solar system.
Reducing the concentration of reactants