Question

The number of grams of anhydrous Na2CO3 present in 250 ml of 0.25 M solution is -------?

Answer 1

$62.5 \times 10 { }^{ - 3} mole$

Answer 2

molar mass is a physical property that means a mass of a substance divided by the amount of substance. the SI unit of molar mass is kg/mol. in short it is total weight of a substance, for 1 mole of substance. i.e., the weight of a substance 6.023*10^{23}[/tex] atoms of that substance.                                                     Molar mass of Na2CO3 = 46 + 12+ 48

                                        = 106g/mol

In 1 liter 0.25 M solution contains 0.25 moles

Mass = Number of moles × molar mass

         = 0.0625 × 106

         = 6.625 g