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Question: > One atom of an element weighs \(3.32 \times 10^{- 23}\)g. How many number of gram atoms are there ...

One atom of an element weighs 3.32×10−233.32 \times 10^{- 23}g. How many number of gram atoms are there in 20 kg of the element?

A

2000

B

20

C

200

D

1000

Answer

1000

Explanation

Solution

(4) : Atomic mass of an element = Mass of one atom×NA=3.32×10−23×6.023×1023=19.99≈20g\times N_{A} = 3.32 \times 10^{- 23} \times 6.023 \times 10^{23} = 19.99 \approx 20g

No. of gram atoms

= MassofelementingramsAtomicmassingrams\frac{Massofelementingrams}{Atomicmassingrams}

= 20×100020=1000\frac{20 \times 1000}{20} = 1000