Bookback questions: choose the correct answer — task. Science State Board, Class 10.

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1.

Which of the following represents

$1$

$amu$ ?

Mass of a $C –12$ atom
Mass of a hydrogen atom
1/12th of the mass of a (C –12\) atom
Mass of $O –16$ atom

2.

$1$ mole of any substance contains ____ molecules.

$6.023\times10^{23}$
$6.023\times10^{-23}$
$3.0115\times10^{23}$
$12.046\times10^{23}$

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