a) This statement is true i.e., one mole of all sub-stances contain the same number of specified particles. According to Avogadro’s law.
1 mole of any substance contains 6.022 × 1023 specified particles.
b) Number of moles = \(\frac{Mass\,in\,gram}{Molar\,mass}\)
1 gram mole is the molecular mass expressed in gram. It is the mass of 1 mole molecules in gram. Thus, 1 gram mole contains 1 mole molecules.
1 gram atom is the atomic mass expressed in gram. It is the mass of 1 mole atoms in gram. Thus, 1 gram atom contains 1 mole atoms.
c) Number of moles is directly proportional to volume (according to Avogadro law).
(d) No. of moles = \(\frac{Volume\,in\,L}{22.4L}\)
= \(\frac{11.2L}{22.4L}\) = \(\frac{1}{2}\)