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13.8 g element consist 4.6xx10^(22) atom...

13.8 g element consist `4.6xx10^(22)` atoms which the atomic mass of element ?

A

290

B

180

C

34.4

D

10.4

Text Solution

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The correct Answer is:
A, B
`4.6xx10^(22)` atoms `= 13.8g`
`6.022xx10^(23)` atoms `=(?)`
Atomic mass `=(6.022xx10^(23)xx13.8)/(4.6xx10^(22))`
`= 180.66 ~~180 g "mole"^(-1)`
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