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3. ATOMS AND MOLECULES
hard
$16\, g$ ठोस सल्फर में सल्फर $\left( S _{8}\right)$ के अणुओं की संख्या का परिकलन कीजिए।
A
$5.59 \times 10^{23}$
B
$0.376 \times 10^{23}$
C
$37.6 \times 10^{23}$
D
$3.76 \times 10^{23}$
Solution
Molar mass of sulphur $(S_8)=32 \times 8=256\,g$
Number of $S_8$ molecules in $256\, g$ of solid sulphur $=6.022 \times 10^{23}$
Number of $S_8$ molecules in $16\,g$ of solid sulphur $=\frac{6.022\times {{10}^{23}}}{256}\times 16\,g$
$=3.76 \times 10^{23}$ molecules
Standard 9
Science
