. One atoms of an element x weigh 6.64310-23g. Number of moles in 20 kg is :

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Solution

Dear Pranay And Prachi,

$I n 1 m o l e t h e n o . o f a t o m s = 6.023 \times 10^{23} w t . o f 1 a t o m = 6.6431 \times 10^{- 23} g w t . o f 1 m o l e a t o m = 6.023 \times 10^{23} \times 6.6431 \times 10^{- 23} g / m o l w t o f 1 m o l e a t o m = 40 g / m o l N o . o f m o l e s p r e s e n t i n 20000 g = \frac{20000}{40} = 500 m o l e s o f a t o m 500 m o l e s o f a t o m a r e p r e s e n t i n 20 k g$

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