Answer:
(A) 0.80 M
(B) 0.64 g
(C) 0.050 M
(D) 1.6 M
Explanation:
(A)
Convert 4.0 g to moles with molar mass. Convert 125 mL to L.
4.0 g x (1 mol/39.998 g) = 0.100 mol
125 mL x (1 L/1000 mL) = 0.125 L
Molarity = mol/L
Molarity = 0.100 mol/0.125 L = 0.80 M
(B)
Find moles of NaOH with the molarity you just found. And convert 20 mL to L.
Molarity = mol/L
0.80 M = mol/0.020 L
mol = 0.016
Convert moles to grams with molar mass.
0.016 mol x (39.998 g/1 mol) = 0.64 g
(C)
You know the molarity of a NaOH solution (Part A). 30 mL initial volume and 480 mL final volume are given. Dilution question so use the dilution formula.
M1V1 = M2V2
(0.80 M)(30 mL) = (M2)(480 mL)
M2 = 0.050 M
(D)
Dilution question again, use the dilution formula.
M1V1 = M2V2
(0.80 M)(200 mL) = (M2)(100 mL)
M2 = 1.6 M
Answer:
6 moles of ZnSO₄ produces 6 moles of Ag₂SO₄ .
Explanation:
Given data:
Moles of ZnSO₄ = 6.00 mol
Moles of Ag₂SO₄ = ?
Solution:
Chemical equation:
2Ag + ZnSO₄ → Ag₂SO₄ + Zn
Now we will compare the moles of ZnSO₄ and Ag₂SO₄.
ZnSO₄ : Ag₂SO₄
1 : 1
6.00 : 6.00
So 6 moles of ZnSO₄ produces 6 moles of Ag₂SO₄ .
Answer:
- <em>Coal combustion</em> is burning coal to produce electricity, but it releases a lot of pollutants to the atmosphere.
Explanation:
<em>Coal combustion</em> is the process of burning coal to produce energy: the combustion releases heat which is used to heat water, producing steam which is used to move turbines and produce electricity.
The chemical equation for the combustion of pure coal is:
That is called complete combustion.
Incomplete combustion also happens:
CO₂ is a greenhouse gas, thus it is a pollutants.
Also, mined coal contain a lot of other elements, like sulfur (S), nitrogen (N), organic compounds, and heavy metals, which implies many side reactions. So, the combustion of coal releases a lot of pollutants to the atmosphere, which is why this is considered a dirty process.
Oxidation is a process which involves losing electrons in a reaction by an ion, atom or a molecule. It happens when the oxidation state of the ion, atom or the molecule is being increased. Chloride anions has an oxidation state of -1 and dichlorine has an oxidation state of zero or neutral charge. The balanced half-reaction would be written as:
2Cl- = Cl2 + 2e-
To balance the charge on both sides, two electrons should be produced or released by the anion form of chlorine. Being oxidized would mean that the charge of the ion or molecule is being increased. In this case, it is increased from -1 to 0.