Which has more number of atoms,100,g of sodiu | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The number of atoms in a given mass of an element is calculated using the formula: $	ext{Number of atoms} = \frac{	ext{Given mass}}{	ext{Atomic

Vedclass · Accepted Answer

$100\,g$ of sodium

Vedclass · Answer

(D) The number of atoms in a given mass of an element is calculated using the formula: $	ext{Number of atoms} = \frac{	ext{Given mass}}{	ext{Atomic mass}} 	imes N_A$,where $N_A$ is Avogadro's number $(6.022 	imes 10^{23} 	ext{ mol}^{-1})$.For $100\,g$ of Sodium $(Na)$:$	ext{Number of atoms} = \frac{100}{23} 	imes 6.022 	imes 10^{23} \approx 2.618 	imes 10^{24}$ atoms.For $100\,g$ of Iron $(Fe)$:$	ext{Number of atoms} = \frac{100}{56} 	imes 6.022 	imes 10^{23} \approx 1.075 	imes 10^{24}$ atoms.Comparing the two values,$2.618 	imes 10^{24} > 1.075 	imes 10^{24}$.Therefore,$100\,g$ of sodium contains a greater number of atoms than $100\,g$ of iron.

Which has more number of atoms,$100\,g$ of sodium or $100\,g$ of iron (given,atomic mass of $Na = 23\,u, Fe = 56\,u$)?

Similar Questions

Define the atomic mass unit.

Write down the chemical formulae of:
$(i)$ Sodium oxide
$(ii)$ Aluminium chloride
$(iii)$ Sodium sulphide
$(iv)$ Magnesium hydroxide

Calculate the molecular masses of $CO_2$,$CH_4$ and $C_2H_6$.

Which postulate of Dalton's atomic theory can explain the law of definite proportions?

Calculate the number of molecules of sulphur $(S_8)$ present in $16 \, g$ of solid sulphur.

Vedclass Test Series

Exam Paper Generator

Online Exam Module