Answer:
This question is incomplete because of the absence of the molecules been referred to in the question. However, the molecules been referred to in the question is in the attachment below
Explanation:
First of all, we have to define lewis acid and lewis base.
A lewis acid is a substance that has the capacity to accept a pair of electrons. For example, H⁺. While a lewis base is a substance that is capable of donating a pair of electrons (to a lewis acid). For example, OH⁻.
Going by the definitions above, we can deduce the type of substance the molecules in the question (attachment) are
a. BF₃ (boron trifluoride) is a lewis acid because the central atom (as suggested to be focused on in the question) which is <u>boron, has the capacity to accept a pair of electrons</u>.
b. The central atom (carbon) in the compound (2-methyl propane) <u>also has the capacity to accept a pair of electrons</u> since it is positively charged (is electron deficient). Hence, it is a lewis acid.
c. The functional group in this compound (trimethyl borate) is the ether. Ethers are generally lewis bases because the oxygen atom in an ether can donate a pair of electrons from it's lone pair. However, the <u>presence of boron which is central to the compound</u> shows it is also a lewis acid, although weak (majorly due to the presence of the ethers).
<u>Answer:</u> When oppositely charged species interact.
<u>Explanation:</u>
Ionic compound is defined as the compound which is formed by the complete transfer of electrons from one element to another element.
In these compounds, oppositely charged ions are attracted towards each other to form a compound.
<u>For Example:</u> NaCl is formed by the attraction of 
ions. So, same number of oppositely charges maintain electrical neutrality.
Electrical neutrality in a compound is achieved when atoms forming a compound have same number of opposite charges. Basically the charges on cation is balanced by the charges on anion.
Explanation:
It is known that molality is the number of moles present in kg of solution.
Mathematically, Molality = 
The given data is as follows.
Molar mass of ammonia = 17 g/mol
Concentration = 1.002 mg/L = 
= 
mol/L
Also, density = 
= 1 kg/L
Therefore, molality will be calculated as follows.
Molality = 
= 
And,
Molar mass of nitrite = 46 g/mol
Concentration = 0.387 mg/L = 
= 
mol/L
And, density = = 1 kg/L
Hence, molality = 
= mol/kg
Now, Molar mass of nitarte = 62 g/mol
Concentration = 1352.2 mg/L
= 
= 0.02181 mol/L
Also, density = = 1 kg/L
Hence, molality will be calculated as follows.
Molality = 
= 0.02181 mol/kg
Therefore, molality of given species is for ammonia, mol/kg for nitrite, and 0.02181 mol/kg for nitrate ion.
Answer:
22.13g
Explanation:
We'll begin by writing a balanced equation for the reaction. This is illustrated below:
2C2H2 + 5O2 —> 4CO2 + 2H2O
Next, we'll calculate the mass of C2H2 and O2 that reacted from the balanced equation. This is illustrated below:
Molar Mass of C2H2 = (12x2) + (2x1)
= 24 + 2 = 26g/mol
Mass of C2H2 that reacted from the balanced equation = 2 x 26 = 52g
Molar Mass of O2 = 16x2 = 32g/mol
Mass of O2 that reacted from the balanced equation = 5 x 32 = 160g
Now, we can obtain the mass of C2H2 that will react with 68.1g of O2 as follow:
From the balanced equation above,
52g of C2H2 reacted with 160g of O2.
Therefore, Xg of C2H2 will react with 68.1g of O2 i.e
Xg of C2H2 = (52x68.1)/160
Xg of C2H2 = 22.13g
Therefore, 22.13g of C2H2 is needed to react with 68.1g of O2
