Mole ConceptMedium
Question
Number of moles and number of molecules in 1.4187 L of ${SO}_{2}$ at STP respectively are
Options
A.$0.1266;3.812 \times 10^{22}$
B.$0.0633;3.812 \times 10^{22}$
C.$0.1266;7.6238 \times 10^{22}$
D.$0.0633;7.6238 \times 10^{22}$
Solution
Sol. [Key Concept: Moles $= \frac{V}{22.7}$ at STP; number of molecules $=$ moles $\times 6.022 \times 10^{23}$.]
$\ $ moles $= \frac{V\text{~}\text{lit}\text{~}}{22.7\text{~}\text{lit}\text{~}} \Rightarrow \frac{1.4187\text{~}\text{lit}\text{~}}{22.7\text{~}\text{lit}\text{~}} \Rightarrow 0.0633$
no. of molecules $=$ moles $\times 6.023 \times 10^{23}$
$${\Rightarrow 0.0633 \times 6.032 \times 10^{3} }{= 3.812 \times 10^{22} }$$
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