Answer:
The answer to your question is: Oxidation number is III,
formula Cr₂(SO₄)₃
Explanation:
Data
Chromium (III) sulfate
Oxidation state of Cr = ?
Chemical formula
Process
The oxidation number of Chromium is given in roman numerals, then the oxidation number is III.
Chemical formula Cr₂(SO₄)₃
The percet of Al will be 100 times the mass of Al in the formula divided by the molar mass of the compound.
This table shows all the calculations involved
Compound: Al2 (OH)5 Cl
element # of atomic mass in the %
atoms mass formula
g/mol
Al 2 27 2*27 = 54 g (54 / 174.5)*100 = 30.9%
O 5 16 5*16 = 80 g
H 5 1 5*1 = 5 g
Cl 1 35.5 1*35.5 = 35.5 g
----------------------
molar mass 174.5 g
Answer: 30.9%
Small intestine do most of digestion & absorption from food. It then passes it to large intestine. Large intestine absorbs water & some nutrients like water soluble vitamins from it & stores until it gets removed from body.
This problem is providing information about possible causes whereby mussel shells are being eroded due to the acidity in the ocean. In such a way, it claims that more acidic oceans dissolve calcium carbonate in a faster way and produce hydrogen carbonate ions, and thus, a feasible explanation is required as well as a hypothesis according to the following choices:
a. Lower CO₂; this reduces the H₂CO₃ and increases the pH.
b. Add CO₃²⁻: this will add base and increase its concentration.
c. Add Ca²⁺: this will increase the precipitation rate of calcium carbonate (correct choice).
<h3>Equilibrium equations:</h3>
At first instance, we should recall the equilibrium equations that take place when acidic oceans dissolve calcium carbonate in a faster way:
<h3>Shifts from equilibrium:</h3>
Where we can see that the first choice is thoroughly discarded as the addition of CO₂ actually increases the ionizable carbonic acid (acidity). Moreover, the addition of CO₃²⁻ may also lead to the formation of more protons-releasing carbonic acid which also contributes to the acidity of the ocean.
<h3>Hypothesis:</h3>
Thereby, the correct condition that, for sure, contributes to the preservation of mussel shells will be the addition of Ca²⁺ and the hypothesis will be that it shifts the equilibrium towards the formation of more CaCO₃, the active compound in these shells.
Learn more: