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in Some Basic Concepts of Chemistry by (30.3k points)
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“One mole of all substances contain the same number of specified particles.” 

(a) Justify the statement. 

(b) How to connect mole, gram mole, and gram atom? 

(c) What is the relation between number of moles and volume? 

(d) Calculate the number of moles of a gas in 11.2 L at • STP.

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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 = \(\frac{Volume\,in\,L}{22.4L}\) 

\(\frac{11.2L}{22.4L}\) = \(\frac{1}{2}\)

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