How many gram atoms and atoms are there in 10 grams of calcium ?

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0.1 gram atoms, $1.50 \times 10^{23} atoms$

0.1 gram atoms, $6.023 \times 10^{23} atoms$

0.25 gram atoms, $1.50 \times 10^{23} atoms$

0.25 gram atoms, $6.023 \times 10^{- 23} atoms$

answer is B.

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Detailed Solution

(i) 40 g of calcium atoms represents $\to$ 1gram atom

10 g of calcium atoms represents $\to$ $x$ gram atoms

Then we will get,

$x = \frac{10}{40} = 0.25 gram atoms$

(ii) 40 g of calcium atoms $= 6.023 \times 10^{23} atoms$

10 g of calcium atoms $= y$

$y = \frac{10}{40} \times 6.023 \times 10^{23} = 1.50 \times 10^{23} atoms$

Therefore, 10 g of Ca contains 0.25 gram atoms and $1.50 \times 10^{23}$ atoms.

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