Question

i) What is the difference between the molecules of an element and the molecules of a

compound. Explain with an example.

ii) Calculate the total number of moles in 0.585g of sodium chloride .

[Atomic mass of N= 14u, H=1, Cl= 35.5u, Na= 23u]​

Answer 1

Answer:

The only difference between a molecule of a compound and a molecule of an element is that in a molecule of an element, all the atoms are the same. For example, in a molecule of water (a compound), there is one oxygen atom and two hydrogen atoms. But in a molecule of oxygen (an element), both of the atoms are oxygen.

Answer 2

Answer:

1. A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance which is formed by two or more different types of elements which are united chemically in a fixed proportion. ... An example of a molecule is ozone. An example of a compound is table salt (sodium chloride).
2. Answer. ⇒⇒ 1g of NaCl contains = (1/ 58.5) mole of NaCl molecules. 5.58g of NaCl contains = (1×× 5.58/58.5) mole of NaCl molecules.