Question

The mass of one ${}^{12}C$ atom in gram is:

• A. $1.9927\times {10}^{-23}g$
• B. $4.3478\times {10}^{-18}g$
• C. $5.6123\times {10}^{-23}g$
• D. $3.9927\times {10}^{-23}g$

Answer 1

The correct option is A $1.9927\times {10}^{-23}g$

Mass of 1 atom of ${}^{12}C$ $=\frac{Atomicmassofcarbon}{Avogadr{o}^{\prime }snumber}$

$=\frac{12}{6.022\times {10}^{23}}=1.9927\times {10}^{-23}g$

Hence, option A is correct.