Answer: I think it is noble gasses.
Explanation: Use the website Dynamic Periodic Table for stuff like that it helps.
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.
What is the exoeruent. Searched it up on google and only came up with two search results. None related to chemistry