Which of the following weighs the most - 0.1 mole of Sodium, 10^23 molecules of SO2 gas, 0.1g of iron or 10^23 atoms of silver.

Dear student

1.no.of moles = weight/molar mass
Molar mass of sodium atom = 23 g mol-1
0.1 = weight/23
weight of sodium =  2.3g

2.We know that 6.022 X 1023 molecules = 1 mol
1 molecule = 1/6.022 × 1023 moles
1023 molecules = 1023/ 6.022 × 1023  = 1/6.022 mol
Number of moles = given mass / molar mass
given mass of CO2 = no. of moles X molar mass
                            =  1/6.022 x 64 
                             = 10.63g

3, mass of iron =0.1g

4.1 mole of silver weighs 108 grams.
which implies 1 atom weighs
1 \div 6.023 \times {10}^{23}
Therefore 1023 atoms will weigh
16.023 x 1023x 1023  g
=0.166g

Thus 1023 molecules of SO2 gas weigh the most

Regards

 

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