# A SAMPLE CONTAINS 200 ATOMS OF HYDROGEN, O.O5 GRAM ATOM OF NITROGEN ,10 TO THE POWER -20 GRAM OF OXYGEN.WHAT IS THE APPROXIMATE NO.OF TOTAL ATOMS ?

Number of hydrogen atoms = 200

Gram atom of nitrogen = 0.05g
14 grams atom of nitrogen = 6.022$×$1023 atoms of nitrogen
Now 0.05 grams atom of nitrogen will have =

Oxygen = 10-20 g
​16 grams of oxygen = ​ 6.022$×$1023 atoms of oxygen
10-20 grams of oxygen will have =

Total number of atoms = 200 + (0.0215$×$1023) + 376.38 = 2.15$×$1021 atoms

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