Question

calculate the number of particle in each of the following ;

i) 46 gram of Na atom ( number from Mass )

ii) 8 gram oxygen molecule ( number of molecules from Mass ) ​​

Answer 1

Question

calculate the number of particle in each of the following ;

i) 46 gram of sodium atom ( number from mass )

ii) 8 gram of oxygen molecule ( number of molecules from Mass)

Answer

i) 46 gram of sodium atom

number of atoms

= given mass / molar mass × Avogadro number

=> N = m/M ×No

=> N = 46/23×6.022×10^23

=> N = 12.044 ×10^23

so the required answer is 12.044×10^23 .

ii) 8 gram of oxygen molecule

number of molecules

= given mass/ molar mass × Avogadro number

=> N = m/M × No

atomic mass of oxygen = 16 u

molar mass of O2 molecule ,

= 16×2=32g

=> N = 8/32 ×6.022×10^23

=>N = 1.5055×10^23

=>N = 1.51 ×10^23

so the required answer is 1.51×10^23

Answer 2

$\huge\boxed{\dag\sf\red{ANSWER}\dag}$

i ) 1 mole of Na contains = 6.022 x 10^{23} atoms

    46 gram of Na Atoms will contain = $\frac{6.022*10^{23}*46}{23}$

                                                             =  $12.044 * 10^{23}$ Atoms

                                                                     

   

ii) 1 mole of $O_{2}$ molecule contains = 6.022 x 10^{23} atoms

    8 gram of  $O_{2}$  molecules will contain =  $6.022 * 10^{23} * \frac{8}{32}$  molecules

                                                                      = $1.5055 * 10^{23}$ molecules

$\frac{Hope-it-helps}{u}$

$\huge\boxed{\dag\sf\blue{@kartik}\dag}$