A) \[3\times {{10}^{-26}}\]kg
B) \[3\times {{10}^{-25}}\]kg
C) \[1.5\times {{10}^{-26}}\]kg
D) \[2.5\times {{10}^{-26}}\]kg
Correct Answer: A
Solution :
\[6\times {{10}^{23}}\]molecules has mass \[=18gm\] 1 molecules has mass \[=\frac{18}{6\times {{10}^{23}}}\]\[=3\times {{10}^{-23}}gm\] \[=3\times {{10}^{-26}}kg\].
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