How many molecules are in 68.0 g of H2S

The correct answer is 12.044 * 10²³ molecules.

The molecular mass of H₂S is 34 gram per mole.

Number of moles is determined by using the formula,

Number of moles = mass/molecular mass

Given mass is 68 grams, so no of moles will be,

68/34 = 2 moles

1 mole comprises 6.022 * 10²³ molecules, therefore, 2 moles will comprise = 6.022 * 10²³ * 2

= 12.044 * 10²³ molecules.