3.5g of CO gas at 0oC and 760 mm pressure contains
3.5 `xx` 6.02 `xx` 1023molecules
28 `xx` 6.02 `xx` 1023 molecules
7.525 `xx` 1022 molecules
1.25 `xx` 1022 molecules
i used the same process given here but getting C option as answer please explain it once.