Answer:
<h2>0.8 moles </h2>
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
We have the final answer as
<h3>0.8 moles</h3>
Hope this helps you
Answer:
6.7970 g
Explanation:
Considering the Henderson- Hasselbalch equation for the calculation of the pOH of the basic buffer solution as:
pOH = pK + log[acid] / [base]
Where K is the dissociation constant of the base.
Base dissociation constant of the ammonia = 1.8×10⁻⁵
pK = - log (Kb) = - log (1.8×10⁻⁵) = 4.75
Given concentration of base = [base] = 0.273 M
pH = 10.150
pOH = 14 - pH = 14 - 10.150 = 3.85
So,
3.85 = 4.75 + log[acid]/0.273
[Acid] = 0.0347 M
Given that Volume = 2 L
So, Moles = Molarity × Volume
Moles = 0.0347 × 2 = 0.0694 moles
Molar mass of ammonium bromide = 97.94 g/mol
Mass = Moles × Molar mass = (0.00775 × 97.94) g = 6.7970 g
Answer:
(i) Formula = Fe₂(SO₄)₃
Name = Iron (III) Sulfate or ferric sulfate
(ii) Formula (NH₄)₂CO₃
Name = Ammonium Carbonate
Explanation:
Data given:
(i) Fe³⁺ and SO₄²⁻
ii) NH₄⁺ and CO₃²⁻
Formula and named of the compound =?
Solution:
(i) compound from Fe³⁺ and SO₄²⁻ and its name
writing a formula in combined form
- The symbols of two ions written together that is FeSO₄
- The charges shown on each atom is its valency and it show its combining tendency so iron will combine with 3 sulfate ions and sulfate ion will combine with 2 iron ions
- When two ions combine their valencies should be write on the base of the alternate ions.
- that is 2 will be at the base of Fe and 3 will be at the base of SO₄ without charges
- So the combined formula and name will be
compound formula form from Fe³⁺ and SO₄²⁻ = Fe₂(SO₄)₃
Name of the compound = Iron (III) Sulfate or ferric sulfate
______
(ii) compound from NH₄⁺ and CO₃²⁻ and its name
writing a formula in combined form
- The symbols of two ions written together that is NH₄CO₃
- The charges shown on each atom is its valency and it show its combining tendency so NH₄⁺ will combine with 1 carbonate ion and carbonate ion will combine with two NH₄⁺ ions
- When two ions combine their valencies should be write on the base of the alternate ions 1 should not be written.
- 2 will be at the base of NH₄⁺ without charge
- So the combined formula and name will be
compound formula form from NH₄⁺ and CO₃²⁻ = (NH₄)₂CO₃
Name of the compound = Ammonium Carbonate
A. MnS(s) + 2H + (aq) > Mn2 + (aq) + H2S(g)
Answer:
They grow slowly over time, they are made up of multiple organisms.
Explanation:
One polyp is one individual. A Coral is made up of several polyps. Each polyp is less than 1 centimeters but a coral is made of many polyp so the coral itself cant be 1 centimeters across.