1.

Write the chemical formual the followin compounds and also calcuate their formula write mass (a) Baking soda (b) Caustic soda (c )Common salt (d) Magnessium (e )Sodium carbonate.

Answer»

Solution :Baking soda `(NaHCO_(3))`
`"Formula units mass"="ATOMIC mass of Na"+"Atomic mass of H"+"Atomic mass of C"+3xx"Atomic mass of O"`
(b) CAUSTIC soda `"Formula unit mass"="Atomic mass of Na"+"Atomic mass of O"+"Atomic mass of H"=23+16+1=40u`
(c )Common salt (NaCl)
`"Formulae unit mass"="Atomic mass of Na"+Aromic mass of Cl"=23+35.5=58.5u`
(d) Magnesium sulphate `(MgSO_(4))`
`"Formulae unit mass"="Atomic mass of Mg"+"Aromic mass of S"+4xx"atomic mass of O"=24+32+4xx"atomic mass"`
`=24+32+4xx16=120u`
(e )Sodium carbonate `(Na_(2)CO_(3))`
`"Formulae unit mass"=2xx"Atomic mass of Na"+"Aromic mass of C"+3xx"atomic mass of O"=24+32+4xx"atomic mass of O"`
`=2xx23+12+3xx16=106u`


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