Answer:
45.165× 10²³ NH₄⁺ ions
Explanation:
Given data:
Number of NH₄⁺ ions present = ?
Moles of (NH₄)₃PO₄ = 2.5 mol
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
1 mole of (NH₄)₃PO₄ = 3 mole NH₄⁺
In 2.5 moles of (NH₄)₃PO₄ = 2.5× 3 = 7.5 moles of NH₄⁺
Number of ions of NH₄⁺ in 2.5 moles of (NH₄)₃PO₄:
7.5 mole of NH₄⁺ × 6.022 × 10²³ NH₄⁺ ions / 1 mol
45.165× 10²³ NH₄⁺ ions
Answer:
0.196 M
Explanation:
First, we have to calculate the moles of sodium hydroxide.
moles = mass / molar mass
moles = 3.9280 g / (39.997 g/mol) = 0.098207 mol
It is important to realize that even though 300 mL is the volume of water firstly added to dissolve the hydroxide, the flask is then filled to the mark, meaning that the volume of the solution is 500 mL = 0.500 L.
The molar concentration of sodium hydroxide is:
The concentration is an intensive property, that is, it does not depend on the amount of matter. As a consequence, the concentration of the 50 mL of solution in the buret is the same as the concentration in the flask.
Answer:
The molecular geometry of SO3 is trigonal planar.
Explanation:
Look at the Lewis
A cation is an atom or group of atoms that have a positive charge.
Answer: The bond formed between magnesium and oxygen is an ionic bond.
Explanation:
An ionic bond is formed when an atom transfer its valence electrons to another atom.
Whereas, a covalent bond is formed by the sharing of electrons between the atoms.
Silicon and oxygen forms silicon dioxide. Silicon has 4 valence electrons which are shared with each oxygen atom. Hence, silicon and oxygen forms a covalent bond.
Oxygen and oxygen shares two pairs of electrons therefore, a covalent bond is formed between oxygen and oxygen.
A covalent bond is formed between carbon and hydrogen as carbon has 4 valence electrons which are shared with four hydrogen atoms.
Magnesium has 2 valence electrons which are transferred to the oxygen atom in order to complete its octet.
Therefore, the bond formed between magnesium and oxygen is an ionic bond.