How many moles of tungsten atoms are there in 9.6×10^25 atoms of bromine

There are two questions here;

1. How many moles of tungsten atoms are there in 9.6*10^25 atoms of bromine?

This question is invalid as it is quite impossible to obtain the number of moles of tungsten atoms in another element, bromine. The question would have been written as the number of moles of tungsten atoms in 9.6*10^25 atoms of tungsten or bromine as the case may be.

To solve for the number of moles of an atom; we should recur that

I mole of an atom = 6.02*10^23 atoms

6.02*10^23 atoms  = 1 mole

9.6*10^25 atoms =  (9.6 *10^25 / 6.02*10^23) moles

                           = 1.595 *10^2 moles

2. The reaction of 9 moles of O2 will produce moles of H2O in the combustion reaction of propane.

C3H8 + 5O2 > 3CO2 + 4H2O

5 moles of O2 produces 4 moles of H2O

9 moles of O2 will produce (9 * 4/ 5) moles of H2O

                              = 7.2 moles of H2O

9moles of O2 will produce 7.2 moles of H2O.

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