what will be the mass of 1.4 l O2 in STP?
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Oxygen has an atomic mass of (2x16) 32u which means 1 mole will weight 32 grams.
Since you have 1 liter weighting 1.43 grams you have to divide 1.43 by 32 to get to know how much mole you have got.
Out of this you will get 4.46x10^-2 mole. You then have to multiply this with the amount of molecules in one mole which is 6,022 14 × 10^23.
The final answer is 2.69x10^22 molecules
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