Question

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Answer 1

To work out the number of moles you can use the equation \[Moles = Mass (g) \div RFM\] where RFM is relative formula mass (found by adding up the masses you find on the periodic table)

So for example for water \[Moles = 84\div18\] (18 is from Oxygen at 16 and 2 Hydrogen at 1 RAM (relative atomic mass)

To work out the number of particles one must use Avagadro's number

\[No. particles = Moles \times 6.022x10^{23}\]

So you substitute in the numbers you got from the first part of the question