Q 7.     What is the mass of— 

   (c)     10 moles of sodium sulphite (Na2SO3 )?

Answers (1)

The molecular mass of Sodium sulphite (Na2SO3 ) = 2 * 23 + 32 + 3 * 16 

                                                                                 = 126u 

Mass of 10 moles of sodium sulphite = 10 x Mass of 1 mole of Na2SO3 

                                                           = 10 x molecular mass of Na2SO3 in grams

                                                           = 10 x 126 g 

                                                           = 1260 g.

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