PH = -lg[H+]
pH = -lg[6.38·10-6] = 5.2
Answer:
A compound
Explanation:
Chemical compound can be regarded as any substance made up of identical molecules which consists atoms of two or more than two chemical elements. For example four hydrogen atoms bonds with a carbon atom to give methane molecule which is a compound. It should be noted that A compound is a new substance with unique chemical and physical properties formed when two or more elements are chemically bonded during a physical reaction.
Molarity (M) = moles of the solute (mol) / Volume of the solution (L)
The molarity of the given KCl solution = 2.10 M
Volume of the given KCl solution = 85.0 mL
Hence,
2.10 M = Moles of KCl / 85.0 x 10⁻³ L
Moles of KCl = 2.10 M x 85.0 x 10⁻³ L
= 0.1785 mol
Moles (mol) = Mass (g) / Molar mass (g mol⁻¹)
Molar mass of KCl = 74.56 g mol⁻¹
Hence,
0.1785 mol = Mass of KCl / 74.56 g mol⁻¹
Mass of KCl = 0.1785 mol x 74.56 g mol⁻¹
= 13.30 g
Hence, mass of given KCl in 85.0 mL is 13.30 g.
Answer:
450 g/mol
Explanation:
To solve the problem the problem, it is necessary to use Graham's Law of effusion
This answer is consistent with what we know. A heavier gas will require more time to effuse than a lighter gas
<span>It’s the gas physical state that shows the greatest
change in volume and changes in temperature or pressure. Because gas is the
matter that is composed of loose particles but can be compressed. Since gas contains
loose molecules, the molecules can freely move in a certain object, so when
physical change happens, it exhibit greatest change. Gas also follow the shape
of its container and can expand in order to fill its container. It has no
definite volume or shape. </span>