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Calculate the number of moles in 54.0 grams of Calcium sulfate?
Wiki User
∙ 15y ago
For this you need the atomic (molecular) mass of CaSO4. Take the number of grams and divide it by the Atomic Mass. Multiply by one mole for units to cancel. CaSO4= 136.2 grams
54.0 grams Ca / (136.2 grams) = .396 moles Ca
Wiki User
∙ 15y ago
To calculate the number of moles in a sample, divide the mass of the sample by the molar mass of the compound. The molar mass of calcium sulfate is calculated by adding the atomic masses of calcium, sulfur, and four oxygen atoms: Ca = 40.08 g/mol S = 32.06 g/mol O = 16.00 g/mol Molar mass of calcium sulfate = (40.08 g/mol) + (32.06 g/mol) + (4 × 16.00 g/mol) = 136.14 g/mol
Now we can calculate the number of moles in 54.0 grams of calcium sulfate: Number of moles = mass (g) / molar mass (g/mol) = 54.0 g / 136.14 g/mol = 0.397 moles (rounded to three decimal places)
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