Define Avogadro's constant. How is it related to a mole?
(N/A) Avogadro's constant $(N_A)$ is defined as the number of constituent particles (atoms,molecules,or ions) present in one mole of any substance. Its value is approximately $6.022 \times 10^{23} \text{ particles/mol}$.
Relationship to a mole: $A$ mole is a unit that represents a specific quantity of substance. By definition,one mole of any substance contains exactly $6.022 \times 10^{23}$ elementary entities. Therefore,the number of particles in one mole is equal to Avogadro's constant.
Relationship to a mole: $A$ mole is a unit that represents a specific quantity of substance. By definition,one mole of any substance contains exactly $6.022 \times 10^{23}$ elementary entities. Therefore,the number of particles in one mole is equal to Avogadro's constant.
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$(a)$ Calculate the number of moles in $112 \, g$ of iron.
$(b)$ Calculate the mass of $0.5$ mole of sugar $(C_{12}H_{22}O_{11})$.
$(c)$ Calculate the number of atoms in $8 \, g$ of oxygen $(O_2)$ molecules.
(Atomic mass of $Fe = 56 \, u, C = 12 \, u, H = 1 \, u, O = 16 \, u, N_A = 6.022 \times 10^{23} \, mol^{-1}$)
$(b)$ Calculate the mass of $0.5$ mole of sugar $(C_{12}H_{22}O_{11})$.
$(c)$ Calculate the number of atoms in $8 \, g$ of oxygen $(O_2)$ molecules.
(Atomic mass of $Fe = 56 \, u, C = 12 \, u, H = 1 \, u, O = 16 \, u, N_A = 6.022 \times 10^{23} \, mol^{-1}$)
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