NCERT Question 7 (c) - Chapter 3 Class 9 - Atoms And Molecules

Last updated at Dec. 16, 2024 by

What is the mass of—

(c) 10 moles of sodium sulphite (Na 2 SO 3 )?

 

Answer

We know that,

Mass of 1 mole of a substance = Molar mass of that substance

 

 

(c) 10 moles of sodium sulphite (Na 2 SO 3 )

Mass of 1 mole Na 2 SO 3 atoms =  2 x Molar mass of Na + 1 x Molar Mass of S + 3 x Molar Mass of O 

                                                    = 2 x 23g + 1 x 32g + 3 x 16g

                                                    = 46g + 32g + 48g

                                                    = 126g

 

Mass of 10 moles Na 2 SO 3 atoms   = 10 x  Molar mass of Na 2 SO 3

                                                       = 10 x 126g

                                                       = 1260g

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