Correct statement in the following is/are
A) Mass of one gram molecule oxygen is 32 grams
B) Mass of one gram atom oxygen is 16 grams
C) Mass of one molecule oxygen is 32 amu
D) Mass of one oxygen atom is 16 amu

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All are correct

A and B only

A, B and C only

B and C only

answer is A.

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Detailed Solution

Molecule of oxygen is O₂ which has molar mass of 32 which means mass of 1 gram molecule of O₂ is 32 gm
Atomic mass of O is 16 which means mass of one gram atom of O atom is 16 gm
Molar mass of O₂ is 32 g/mol and it has $6.022 \times 10^{23} molecules .$ Mass of one molecule is: $\frac{32}{6.022 \times 10^{23}} = 5.31 \times 10^{- 23} g$
Atomic mass of O is 16 amu and it has $6.022 \times 10^{23} atoms .$ Mass of one atom is: $\frac{16}{6.022 \times 10^{23}} = 2.66 \times 10^{- 23} g$