Question

class 9 mole concept

Answer 1

A group of Avogadro numb.(6.022*10^23)of a substance (atoms ,molecules ,ions )is called a mole of that substance.the molar mass of subs. is the mass of 1 mole

Answer 2

$1mole = 6.022 \times10 {}^{23}=atomic\\\:mass \: of \: a \: element \:$