Final answer:
To find the number of moles of hydrogen sulfide (H₂S) in a 35.0 g sample, we calculate its molar mass (34.09 g/mol) and use the mass-to-mole conversion formula. The sample contains approximately 1.027 moles of H₂S.
Step-by-step explanation:
To calculate the number of moles of hydrogen sulfide (H₂S) in a 35.0 g sample, we first need to determine the molar mass of H₂S. Hydrogen sulfide consists of two hydrogen atoms (H) and one sulfur atom (S). The atomic mass of hydrogen is approximately 1.01 g/mol and the atomic mass of sulfur is approximately 32.07 g/mol. Therefore, the molar mass of H₂S is (2 × 1.01 g/mol) + 32.07 g/mol = 34.09 g/mol.
Next, we use the formula:
number of moles = mass (g) / molar mass (g/mol)
Substituting the given mass of the sample and the calculated molar mass, we get:
number of moles = 35.0 g / 34.09 g/mol = 1.027 mol
Thus, the 35.0 g sample of H₂S gas contains approximately 1.027 moles of hydrogen sulfide.