Answer:
B2O3
Explanation:
good luck have a nice day
Answer : Al
Explanation :
- For a given redox reaction there must be an oxidizing agent/(s) and a reducing agent/(s).
- the oxidizing agent is the substance that undergoes reduction process (gaining electrons or loss of oxygen atoms), meanwhile, the reducing agent is the substance that undergoes oxidation process (loss of electrons or gaining of oxygen atoms).
- In the reaction above, the oxidation number of (Al) in AlCl3 is (3+). However, the oxidation number of (Al) in the products is zero because it exists as a single element.
Therefore, changing from (3+) to zero means gaining of (3) electrons to neutralize the previously existing (3) protons on (Al) in AlCl3.
So Al is the oxidizing agent..
The square brackets are used in case of complex compounds. This is known as coordination sphere. There is a metal in the coordination sphere and ligands attached to it. This complete set of metals and ligands inside the brackets is complex ion or molecule.
The ions outside this coordination sphere are counter ions of the complex.
It represents that if the complex compound is dissolved in water it will give a complex ion and the counter ion. The atoms in the bracket cannot break there bonds and will remain un-dissociated.
If there is no such bracket then it will represent simple or binary salt.
Answer:
1.30 m
Explanation:
First we <u>calculate the number of moles of solute in the solution</u>, using the <em>definition of molarity</em>:
- Molarity = moles / liters
- Converting 250 mL ⇒ 250 / 1000 = 0.250 L
- moles = 1.50 M * 0.250 L = 0.375 moles
Then we <u>calculate the mass of solvent</u>, using the <em>given volume and density</em>:
- 1.15 g/mL * 250 mL = 287.5 g
- Converting <em>287.5 g to kg</em> ⇒ 287.5 / 1000 = 0.2875 kg
Now we <u>calculate the molality of the solution</u>:
- molality = moles of solute / kg of solvent = 0.375 mol / 0.2875 kg
The answer is c .................
