http://www.adichemistry.com/qb/general/stoichiometry/1-moles-glucose.htmlHow
many moles of glucose molecules are present in 1.8 grams of a
sample of glucose?Logic:The molar mass, sometimes referred to as
molecular weight, is the mass of one mole of a substance and is
usually expressed in grams.Therefore,
In general,
Calculation of molar mass of glucose (C6H12O6)The molar mass of
glucose can be calculated from the molar masses of individual atoms
present in it. From the molecular formula, C6H12O6, one can find
there are 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms in
one molecule of glucose.Molar mass of C = 12 g mol-1Molar mass of H
= 1 g mol-1Molar mass of O = 12 g mol-1
Therefore,Molar mass of C6H12O6=(6x12) + (12x1) + (6x16) = 72 +
12 + 96 = 180 g mol-1Answer:Now we can calculate the number of
moles of glucose as follows:
Calculation of number of moleculesIt is also possible to get the
number of molecules in the given sample by multiplying the number
of moles with Avogadro number, NAThus,the number of molecules =
n.NAWhere NA= 6.022 x 1023In above glucose sample,the no. of
glucose molecules = 0.01 x 6.022 x 1023= 6.022 x 1021
Remember that one mole of any substance contains Avogadro number
of particles (may be atoms or molecules or ions etc.). If the
substance is molecular, the number molecules will be equal to 6.022
x 1023. If we take atomic substance, then the number of atoms in
one mole is equal to Avogadro number.
