IGCSE Chemistry 2022 May/June Paper 22 (MCQ) SOLVED (0620/22/M/J/22)

Hello, this is a fairly recent paper. Remember to read the questions carefully.
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[jmxz]

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[mariamahmed]

Hi, I have a question please . It's written H2S2O7 . The question says how many moles of atoms of oxygen.
So the answer is written 7
But I don’t understand why ?
There are 7 atoms of Oxygen but why is the moles the same number as the atoms
Isn’t any there any difference between

**no of atoms**
and
**moles of atoms** ???