To get the mass of a mole of NaCl, we need to add the molar atomic weights of the individual elements i.e, Na and Cl

Atomic weights of Na = 22.99 gm/mol  Cl = 35.45 gm/mol

Now, mass of a mole of NaCl = 22.99 + 35.45 = 58.44 gm/mol.

An oligarchy is the form of government which is rule by few form and that few people may be military control, or by wealthy society or through ethnic identities.

In DNA, adenine pairs with Thymine. Similarly, in RNA, due to absence of thymine in RNA and the same structure with uracil helps to pair with adenine.

The two major types of computer chips are Microprocessor and Primary memory chips.

When a muscle is contracted and relaxed some amount of heat is released as a by product. 

Land is considered as an important resource because it is useful in producing many things. For example, in agriculture, land is used for cultivating the crop, in industrial use, it is used for constructing factories and to make products that we use.

James Madison was the one who became President in the future after writing The federalist papers. Alexander Hamilton, James Madison and John Jay were the three who wrote The federalist papers.