Question

How many molecules are in a 6.82 gram sample of Hydrogen Sulfide (H2S)

Please show and justify each step

Answer 1

1.204×10^(23)

Step-by-step explanation:

Molecular weight of H2S, M = 1*2+32 = 34

weight of sample, m = 6.82 gram

now number of moles, n= m/M

n= 6.82/34 = 0.200 moles

1 mole has 6.023×10^(23) molecules of H2S.

therefore 0.2 moles of H2S will have 0.2×6.023×10^(23) = 1.204×10^(23) number of H2S molecules.