Question

Calculate the number of oxygen atoms in 0.20 mole of Na2CO3.10H2O

Answer 1

heyy mate here is ur ans....✌❤❤

⏩Molar mass of Na2CO3.10H2O = 46 + 12 + 48 + 36 = 122u

⏩First of all we have to find given mass

⏩So no. of moles = given mass/molar mass

0.20 = x/122

x = 122 × 0.20

x = 24.4

⏩Now we have to find no. of atoms

= given mass/molar mass × avogadro no.

= 24.4/122 × 6.022×10^23

= .2 × 6.022×10^23

= 12.044 × 10^24

⏩so no. of atoms = 12.044×10^24



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(If u have any doubt regarding this u can ask me)