Answer:
One molecule is made of two or more atoms bonded together.
Explanation:
Molecule is a substance which is made up chemically by two or more same or different atoms. The atoms joint together in a molecule due to a chemical bond. This chemical bond is formed either by mutual sharing of electrons or transfer of electrons between two atoms.
Examples:
A molecule of H₂O (water) is made up of two atoms of Hydrogen and one atom of Oxygen (H-O-H).
A molecule of CO₂ (Carbon Dioxide) is formed when a carbon atom is bonded to two oxygen atoms via a double bonds (O=C=O).
A molecule of N₂ (Nitrogen Gas) is formed between two nitrogen atoms through a triple bond (N≡N).
Answer:
10.88 g
Explanation:
We have:
[CH₃COOH] = 0.10 M
pH = 5.25
Ka = 1.80x10⁻⁵
V = 250.0 mL = 0.250 L
The pH of the buffer solution is:
![pH = pKa + log(\frac{[CH_{3}COONa*3H_{2}O]}{[CH_{3}COOH]})](https://tex.z-dn.net/?f=%20pH%20%3D%20pKa%20%2B%20log%28%5Cfrac%7B%5BCH_%7B3%7DCOONa%2A3H_%7B2%7DO%5D%7D%7B%5BCH_%7B3%7DCOOH%5D%7D%29%20)
(1)
By solving equation (1) for [CH₃COONa*3H₂O] we have:
![log [CH_{3}COONa*3H_{2}O] = pH - pKa + log [CH_{3}COOH]](https://tex.z-dn.net/?f=%20log%20%5BCH_%7B3%7DCOONa%2A3H_%7B2%7DO%5D%20%3D%20pH%20-%20pKa%20%2B%20log%20%5BCH_%7B3%7DCOOH%5D%20)
![log [CH_{3}COONa*3H_{2}O] = 5.25 - (-log(1.80 \cdot 10^{-5})) + log (0.10) = -0.495](https://tex.z-dn.net/?f=%20log%20%5BCH_%7B3%7DCOONa%2A3H_%7B2%7DO%5D%20%3D%205.25%20-%20%28-log%281.80%20%5Ccdot%2010%5E%7B-5%7D%29%29%20%2B%20log%20%280.10%29%20%3D%20-0.495%20)
![[CH_{3}COONa*3H_{2}O] = 10^{-0.495} = 0.32 M](https://tex.z-dn.net/?f=%5BCH_%7B3%7DCOONa%2A3H_%7B2%7DO%5D%20%3D%2010%5E%7B-0.495%7D%20%3D%200.32%20M)
Hence, the mass of the sodium acetate tri-hydrate is:
![m = moles*M = [CH_{3}COONa*3H_{2}O]*V*M = 0.32 mol/L*0.250 L*136 g/mol = 10.88 g](https://tex.z-dn.net/?f=m%20%3D%20moles%2AM%20%3D%20%5BCH_%7B3%7DCOONa%2A3H_%7B2%7DO%5D%2AV%2AM%20%3D%200.32%20mol%2FL%2A0.250%20L%2A136%20g%2Fmol%20%3D%2010.88%20g)
Therefore, the number of grams of CH₃COONa*3H₂O needed to make an acetic acid/sodium acetate tri-hydrate buffer solution is 10.88 g.
I hope it helps you!
Hello there!
The nuclear emanations 1, 2 and 3 are called, respectively:
1) Alpha, beta and gamma
Alpha Radiation consists of two protons and two neutrons, as protons are positive particles, they will be attracted to the negatively charged plate.
Beta Radiation is composed of a high-energy electron. As electrons are negative particles, they will be attracted to the positively charged plate.
Gamma Radiation is composed or photons. Photons don't have charge or mass, and they will not be attracted to the charged plates. This kind of radiation is more penetrating than the other two.
Have a nice day!
That is called an unsaturated solution
