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Calculate mass of sodium which contains ...

Calculate mass of sodium which contains same number of atoms as are present in `4 g` of calcium (Atomic weight `Na = 23`, atomic weight `Ca = 40`)

Text Solution

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`N = m/M xx N_(0)`
`therefore` Number of atoms in 4 g of Ca
`=4/40 xx 6.022 xx 10^(23) = 6.022 xx 10^(22)` atoms
Also, `6.022 xx 10^(23)` atoms of sodium = 23 g
`therefore 6.022 xx 10^(22)` atoms of sodium will have mass `=23/(6.022 xx 10^(23)) xx 6.022 xx 10^(22) = 2.3 g`
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