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Q.

The number of oxygen atoms present in 50g of calcium carbonate is

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a

6.023×1023

b

30.1×1023

c

9.035×1023

d

1.206×1024

answer is C.

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Detailed Solution

1 mole of CaCO3 = 100g

100g of CaCO3 contains 3grams atoms of 'O'

100g of CaCO3 contains 3NA atoms of 'O'

50g of CaCO3 contains 'X' atoms of 'O'

large large X = frac{50 times 3 times N_A}{100}

large X = 9.035 times 10^{23}

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