Calculate the mass of silver chloride required to plate 265 mg of pure silver.

Explanation:

Law of conservation of mass states that mass can neither be created nor it can be destroyed but it can be transformed into one form to another.

Similarly, law of conservation of energy states that energy can neither be created nor it can be destroyed as it can only be transformed from one form to another.

In modern view of matter and energy, is the law of mass conservation still relevant to chemical reactions as follows.

For example,

Atomic mass of Na = 23

Atomic mass of Cl = 35

Hence, mass of total number of reactants is calculated as follows.

             [(2 \times 23) + (35 \times 2)] g/mol = 116 g/mol

Mass of total number of products is calculated as follows.

             [2 \times (23 + 35)] = 116 g/mol

Thus, it is proved that in our modern view of matter and energy, is the law of mass conservation still relevant to chemical reactions.

Answer:

Mass = 42.6 g

Explanation:

Given data:

Mass of CF₂Cl₂ = 31.2 g

Mass of Cl₂ = ?

Solution:

Number of moles of CF₂Cl₂ = mass/molar mass

Number of moles =  31.2 g/121 gmol

Number of moles = 0.3  mol

1 mole of CF₂Cl₂ contain 2 moles of Cl atom.

0.3 mol × 2 = 0.6 mol

Mass of Cl₂:

Mass = number of moles × molar mass

Mass = 0.6 mol × 71 g/mol

Mass = 42.6 g

Answer:

Explanation:

This question seeks to test the knowledge of Avogadro's law. Avogadro's law states that equal volume of gases, at constant temperature and pressure,  contain the same number of molecules. The meaning here is that the volume of a given mass of (ideal) gas is directly proportional to the number of molecules. Thus, an increase in volume of an ideal gas will lead to an increase in the number of molecules of the gas. Also, an increase  in the number of molecules of an ideal gas will lead to an increase in the volume of the gas at constant temperature and pressure.

Answer:

The correct option is : C) limestone.

Explanation:

Carbonate rocks are a type of sedimentary rocks. The carbonate rocks are composed of carbonate minerals. The carbonate minerals are the minerals containing carbonate ion (CO₃²⁻).

The most common type of carbonate rock is limestone. Limestone is composed of the minerals calcite and aragonite, which have a different crystal form of calcium carbonate.

Therefore, Limestone is the most common type of carbonate rock.