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1. )1 mole of hydrogen ions (H+) consist of how many particles?

2. )how many moles of copper are in 6,000,000 atoms of copper?

solution:

3. )how many moles grams are present in a sample containing 2. 71 × 10²⁴ atoms of iron?

solution:

4. )how many atoms of carbon and sulfur are needed to make one molecule of carbon disulfide (CS2)?
5. )how many moles of carbon atoms and sulfur atoms does it takes to makes one mol of carbon disulfide (CS2) molecules?.