Question

What is the molecular mass of glucose ${{C}_{6}}{{H}_{12}}{{O}_{6}}$ molecule up to \[6\] significant figures?
A.$0180.16$
B.$180.16$
C.$180.1620$
D.$180.162$

Answer 1

Hint: We know that the mole concept is very significant and useful in chemistry. It is actually the base of stoichiometry and it provides the best option to express the amounts of reactants as well as products that are consumed and formed during a chemical reaction.

Complete answer:
We know that the molecular mass of any compound can be found out by adding the relative atomic masses of each element present in that particular compound. The chemical formula of a given compound i.e., glucose is ${{C}_{6}}{{H}_{12}}{{O}_{6}}.$ It is clear that glucose contains six atoms of carbon, twelve atoms of hydrogen and six atoms of oxygen and thus its molecular mass can be calculated by adding the mass of six carbon atom, twelve hydrogen atoms and six oxygen atoms. Glucose is a type of carbohydrate. It is the most abundant monosaccharide which is obtained mainly from algae and plants that synthesize it during photosynthesis. Glucose serves as the main source of energy in all organisms. Its structure is as follows.
The atomic weight or atomic mass of an element can be calculated by taking the weighted average of all the isotopes of that element that exist in nature, considering their abundance. The mass of one mole of the substance is said to be the molar mass of that substance. It is usually expressed in g/mol but its SI base unit is kg/mol. It is not a molecular property of a substance but its bulk property.
Therefore, the correct answer is option C.

Note:
Remember that the Moles are the weight of the compound per molar mass of the compound. Formula mass is different from molecular mass. In formula mass, there is an addition of atomic masses of ions present in an ionic compound, whereas molecular mass is the addition of atomic masses of the atoms in a molecule.