Answer:
pH = 2.77
Explanation:
Data Given:
degree of dissociation Ka = 0.057
Concentration of Methanoic acid = 0.005 M
pH = ?
Solution:
First we calculate Hydrogen ion concentration
Formula will be used
[H⁺] = . . . . . . (1)
where
Ka = degree of dissociation
c = concentration
Put values in formula 1
[H⁺] = . . . . . . (1)
[H⁺] = 0.0017 M
Now Calculate the pH
As we know
pH = -log [H⁺] . . . . . .(2)
Put values in equation
pH = - log [ 0.0017 M]
pH = - [-2.77]
pH = 2.77
So,
pH of methanoic acid = 2.77
The fourth period contains 18 elements, beginning with potassium and ending with krypton. As a rule, period 4 elements fill their 4s shells first, then their 3d and 4p shells, in that order; however, there are exceptions, such as chromium.
Cr. I think
Answer:
Option D (191 grams) is correct
Explanation:
Step 1: Data given
Atomic mass of Mg = 24.3 g/mol
Atomic mass of Cl = 35.45 g/mol
Atomic mass of O = 16.0 g/mol
Step 2: Calculate molar mass of Mg(ClO3)2
In 1 molecule Mg(ClO3)2 we have 1x Mg, 2x Cl and 6x O
Molar mass Mg(ClO3)2 = atomic mass of Mg + atomic mass of (2*Cl) + atomic mass of (6x O)
Molar mass Mg(ClO3)2 = 24.3 g/mol + 2*35.45 g/mol + 6* 16.0 g/mol
Molar mass Mg(ClO3)2 = 191.2 g/mol
The molar mass of Mg(ClO3)2 is 191 g/mol
This means 1 mol has a mass of 191 grams
Option D (191 grams) is correct
Answer:
Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.
It offers a route to reducing sodium intake.
Hope I helped.