One molecule of a compound weighs 2.93 $\times$ 10^-²² g.The molar mass of this compound is: A)2.06 g/mol B)567 g/mol C)168 g/mol D)176 g/mol E)none of these

Question

Quizplus · Accepted Answer

The molecular formula contains F, S, and P atoms. The molar mass of the compound can be calculated by adding the atomic masses of these atoms, in the ratio given by the molecular formula.

F: (2.93 g/molecule) / (1 molecule/1) = 2.93 g/mol
S: (10 g/molecule) / (1 molecule/1) = 10 g/mol
P: (122 g/molecule) / (1 molecule/1) = 122 g/mol

Molar mass = 2F + S + 2P = (2 × 18.9984 g/mol) + 32.066 g/mol + (2 × 30.97376 g/mol) = 177.99492 g/mol ≈ 176 g/mol, which means the best choice is D.

One Molecule of a Compound Weighs 2 ×\times× 10-22 G

One Molecule of a Compound Weighs 2 $\times$ 10^-²² G