First slide

Numericals involving moles, molecules and atoms

Question

Five moles of electrons are present in----- grams of methane

Moderate

A

40 g
B

16 g
C

24 g
D

8 g

Solution

Each carbon atom, $C_{6}^{12}$ contains….6 protons, 6 electrons and 6 neutrons ;
Each hydrogen atom, $H_{1}^{1}$ contains….1 proton, 1 electron and zero neutrons ;
Thus each molecule of CH₄ contains…10 protons, 10 electrons and 6 neutrons ;
Thus each mole (16 g) of CH₄ contains…10 moles (10 N_A) of protons, 10 moles (10 N_A) of electrons and 6 moles (6 N_A) of neutrons ;
= $\frac{5 \times 16}{10}$ = 8 gm

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