Answer:
The mass of the acetic acid is 13.5 g
Explanation:
Given;
weight percent of the acetic acid (ratio of solute to total solution), w/w = 98 %
volume of acetic acid, v = 12.83 mL
density of acetic acid, ρ = 1.05 g/mL
density is given by;
density = mass / volume
mass = density x volume
mass of the acetic acid in 12.83 mL = 1.05 g/mL x 12.83 mL
mass of the acetic acid in 12.83 mL = 13.5 g
Therefore, the mass of the acetic acid is 13.5 g
Answer:
a. Molarity=
b. Molality=
Explanation:
Hello,
In this case, given the information about the aniline, whose molar mass is 93g/mol, one could assume the volume of the solution is just 200 mL (0.200 L) as no volume change is observed when mixing, therefore, the molarity results:
Moreover, the molality:
Best regards.
Answer:
- First of all, think the reaction:
4Al + 3O₂ → 2Al₂O₃
- Afterwards, determine the ratio of reactants (4:3)
<u>4</u>Al + <u>3</u>O₂ → 2Al₂O₃
- Convert the mass of Al into moles, by dividing mass / molar mass
48 g / 26.98 g/m = 1.78 mol
- Make a rule of three to determine the moles of O₂
4 mol of Aluminum react with 3 mol of oxygen, so
1.78 mol of Al, will react with (1.78 . 3) / 4 = 1.33 mol of O₂
- Finally, convert the moles in mass like this:
Mol . molar mass = mass → 1.33 mol . 32 g/m = 42.7 grams
Explanation:
Reaction
4Al + 3O₂ → 2Al₂O₃
Answer:
O2 has a double covalent bond
H2 has a single covalent bond
N2 has a triple covalent bond
Explanation:
Hydrogen atoms form only one covalent bond because they have only one valence electron to pair.
Since two electrons form each bond, there are a total of two pairs, or four electrons, in the bond.
The N2 Lewis structure has a triple bond between two nitrogen atoms. According to the octet rule, nitrogen atoms need to bond three times.