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Molecular weight of Sodium bicarbonate = 84 u  or amu

0.45 Molar solution contains 0.45 moles of NaHCO3 in 1 litre water.
So in 850 ml  we have  0.45 * 850/1000  moles
     So weight of NaHCO3  in solution = 0.45 * 850 * 84 / 1000  gms