Question

solve plz.........

DONT SCAM......

Answer 1

Ans will be A ie 2.65

See first balance the reaction

2NaHCo3 -> Na2CO3 + H2O + CO2

So Co2 Will evaporate and H20 will also due to high heat energy so we will left with 1 mole of Na2CO3

Now 2 moles of NaHCO3 gives 1 moleof Na2CO3

So 2 X Molecular mass of NaHCO3

= 2 X 84 = 168 gm

And Molecular mass of Na2CO3 is 106 gm

So 168 gm gives 106 gm

So 4.2 gm gives??? We have use unitary method

4.2 X 106 / 168

445.2 / 168

= 2.65 gm

Is the ans.....

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