Question

please write down the formula mass of SODIUM CARBONATE (Na-23u , C-12u , O-16u , Ca-40u , H-1u)

Answer 1

Calculate the molecular mass of CaCO3 at mass Ca=40u,C=12u,O=16u

Verify by calculating that

5 moles of CO2 and 5 moles of H2O do have the same mass.

240g of calcium and 240g of magnisium element have a mole ratio of 5:3.at mass H=1u ,Ca=40u,Mg=24u

Answer 2

Na2CO3.10H2O
=(2*23+12+3*16+10(2*1+16))u
=(46+12+48+10*18)u
=(106+180)u
=286 u