`underset(("Swollen white mass"))(Na_(2)B_(4)O_(7).XH_(2)O)overset(60^(@)C)rarr underset(("Glassy mass"))(Na_(2)B_(4)O_(7).YH_(2)O)overset(Delta)rarr Na_(2)B_(4)O_(7).ZH_(2)O overset(Delta)rarr B_(2)O_(3)+2NaBO_(2)`, then the valsue of `(x-y+z)` is

Answer

5

Explanation

`Na_(2)B_(4)O_(7).10H_(2)O overset(60^(@)C)rarr Na_(2)B_(4)O_(7).5H_(2)O overset(Delta)rarr`
`Na_(2)B_(4)O_(7)overset(Delta)rarr 2NaBO_(2)+B_(2)O_(3)`
`x=10, y=5, z=0`
`x-y+z=10-5+0=5`