1.

Calculate the number of particle in 8 g O_(2) molecules (number of molecules from mass)

Answer»

Solution :The number of molecules = `("given mass")/("molar mass") xx ` Avogadro number
`IMPLIES N = (m)/(M) xx N_(0)`
Atomic mass of oxygen = 16 u
`therefore` Molar mass of `O_(2)` molecules = `16 xx 2 = 32` G
`implies N = (8)/(32) xx 6 *022 xx 10^(23)`
`= 1*51 xx 10^(23)`


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