1) We should take a hypothetical sample of exactly 100 grams of the compound:
n(hydrogen)=1.007947(moleg)1.2g=1.19054 moles
n(chlorine)=35.4532(moleg)42g=1.184660 moles
n(oxygen)=15.99943(moleg)56.8g=3.550126 moles
2) We should divide by the smallest number of moles:
1.184660moles1.19054moles=1.00496
1.1846601.184660=1
1.1846603.550126=2.9967
3) Finally, we should round to the nearest whole numbers to find the empirical formula:
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