Question

what will b the mass of S2 molecules in grams?
1) 10.62 × 10-23 g
2) 64g
3) 32g
4) 5.2g​

Answer 1

answer : option (1) 10.62 × 10-²³ g

explanation : Atomic mass of S = 32g/mol

so, molecular mass of S2 = 2 × atomic mass of S = 64g/mol.

but here question asked “ what will be mass of S2 molecule in grams ? ”, right?

so, we have to find mass of each molecule of S2.

from above, it is clear that mass of one mole of S2 molecules is 64g.

and we know, 1mole of molecules = 6.023 × 10²³ molecules

so, mass of each molecule of S2 = 64/6.023 × 10²³

= 10.62 × 10-²³ g

hence, option (2) is correct choice.