1.

State the mass of oxygen in 0.1 moleNa_(2)CO_(3)*10 H_(2)O.

Answer»



SOLUTION :`Na_(2)CO_(3) * 10H_(2)O ` : 3 oxygen ATOMS are then
Moles of oxygen : `0.1 XX 3 = 0.3` and 1.0 mol
Mass of oxygen `= "Mole " xx "Atomic mass"`
`=1.3xx16`
`=20.8` gm


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