D.

The water must be heated and removed in distillation, so thermal energy is required.

**The balanced equation :**

**LiI(aq) + AgNO₃(aq) --> AgI(s) + LiNO₃(aq)**

<h3>Further explanation</h3>

**Given**

Word equation

**Required**

Balanced equation

**Solution**

There are 3 ways to express a chemical equation:

- word equation
- skeleton equation
- balanced equation

Skeleton equation for reaction above :

LiI(aq) + AgNO₃(aq) ⇒ AgI(s) + LiNO₃(aq)

If we look at this reaction, all the cations and anions have a charge of 1 (+1 or -1) so the balanced reaction between the skeleton equation and the balanced equation is the same

**Answer:**

**The system has 35% of B.**

**Explanation:**

Number of A atoms = 65

Number of B atoms = 35

Mass of atom A = M

Mass of atom B = 18M

Total atoms of the system = 65 + 35= 100

Total of atoms of B = 35

The percentage of B is the system ;

**The system has 35% of B.**

There are two or more elements.

**Answer:**

The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.

The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.