If you need a sample of 2.841 mol of Na₂S, how many grams do you need? A)0.003640 g B)2.841 g C)78.05 g D)221.7 g

Question

Quizplus · Accepted Answer

The molecular formula for Na₂S is NaSbS2. To find the molar mass, add the atomic masses of Na (22.99 g/mol), Sb (121.76 g/mol), and S (32.07 g/mol, multiplied by 2 for two sulfur atoms), which equals 208.89 g/mol. Multiplying the molar mass by the number of moles (2.841 mol) gives approximately 593.57 g, which is not an option provided. The correct calculation should involve the correct interpretation of the chemical formula, which seems to have been misinterpreted. Assuming the intended formula was NaS (sodium sulfide), the molar mass calculation would be Na (22.99 g/mol) + S (32.07 g/mol) = 55.06 g/mol. Multiplying this by 2.841 moles gives 156.42 g, which also doesn't match any provided options. It appears there was a misunderstanding in interpreting the chemical formula and calculating the mass. Given the options and the likely error in interpreting the formula, none of the answers accurately reflect the correct calculation based on standard atomic masses and the provided formula.

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