Which term should replace the question mark?

The empirical formula tells the proportion of atoms or elements which are

present in a compound and not the exact number of atoms.

The molecular formula tells the exact number of atoms or molecules present

in a compound. An example is H₂0 which tells us that Hydrogen has two

atoms and oxygen has one.

Empirical formula talks about the proportion or ratio in which the molecules

are represented in the compound. This is however the major difference

between the both of them.

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Answer:

Molecular formulas indicate how many atoms there are of each element in a compound, while empirical formulas indicate the reduced proportion of elements in a given compound. The molecular formula can be achieved through the empirical formula if the molecular weight of the compound is known, therefore the empirical formula alone cannot be used to obtain the molecular formula.

Explanation:

An empirical formula expresses the relative relationships of the different atoms in a given compound. For example, H2O is made up of two hydrogen atoms and 1 oxygen atom. In the same way, 1.0 mol of H2O is made up of 2.0 mol of hydrogen and 1.0 mol of oxygen. .

The molecular formula for a compound is always the empirical formula. The molecular formula can be obtained from the empirical formula if the molecular weight of the compound is known.

Answer:

C; Isotopes are the same element with the same number of protons but different numbers of neutrons.

Answer:

Clouds generally form within the troposphere.

Explanation:

A cloud is a mass of water droplets, ice crystals or both at the same time, which remains in suspension in the atmosphere, and whose formation is due to the condensation of water vapor in the sky.

Clouds form when the air is saturated and can no longer contain water vapor, this can happen in two ways:

1. The amount of water in the air has increased.

2. The air cools to its dew point.

Clouds generally form within the troposphere.