1.

Find the gram molecular mass of the following from the data given : (i) H_(2)O (ii) CO_(2) (iii) NaOH (iv) NO_(2) (v) H_(2)SO_(4)

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Solution :
(i) `H_(2)O`
Molecular MASS of `H_(2)O`
`"Atomic mass of 2(H)"=2xx1=2`
`"Atomic mass of 1(O)"=1xx16={:(16),(ulbar(18)):}`
`therefore "Molecular mass of "H_(2)O=18g`
(ii) `CO_(2)`
`"Atomic mass of 1(C )"=1xx12=12`
`"Atomic mass of 2(O)"=2xx16={:(32),(ulbar(32)):}`
`therefore"Molecular mass of "CO_(2)=44g`
(iii) `NaOH`
`"Atomic mass of 1 (Na)"=1xx23=23`
`"Atomic mass of 1(O)"=1xx16=16`
`"Atomic mass of 1(H)"=1xx1={:(1),(ulbar(40)):}`
`therefore"Molecular mass of NaOH"=40g`
(IV) `NO_(2)`
`"Atomic mass of 1(N)"=1xx14=14`
`"Atomic mass of 2(O)"=2xx16={:(32),(ulbar(46)):}`
`therefore"Molecular mass of "NO_(2)=46g`
(v) `H_(2)SO_(4)`
`"Atomic mass of 2(H)"=2xx1=2`
`"Atomic mass of 1(S)"=1xx32=32`
`"Atomic mass of 4(C )"=4xx16={:(64),(ulbar(98)):}`
`therefore" Molecular mass of "H_(2)SO_(4)=98g`


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