Q4. Calculate the formula mass of sodium carbonate. (Na2CO3. 10H20)
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Formula mass of sodium carbonate :
Na2CO3.10H2O = 2×mass of Na+mass of C+3×mass of O+10×mass of H2+10×mass of O
= 2×23+12+3×16+10×2+10×16
= 46+12+48+20+160
= 286g
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