How many moles of calcium sulfate (CaSO4) are there in 44.25g?Express the answer to 3 significant figures.
Question
How many moles of calcium sulfate (CaSO4) are there in 44.25g?Express the answer to 3 significant figures.
Solution
To find the number of moles in a given mass of a substance, we use the formula:
moles = mass / molar mass
First, we need to find the molar mass of calcium sulfate (CaSO4). The molar mass is the sum of the molar masses of each element in the compound, multiplied by the number of times each element appears in the formula.
The molar masses of calcium (Ca), sulfur (S), and oxygen (O) are approximately 40.08 g/mol, 32.06 g/mol, and 16.00 g/mol, respectively.
So, the molar mass of CaSO4 = (40.08 g/mol) + (32.06 g/mol) + 4*(16.00 g/mol) = 136.14 g/mol
Now, we can find the number of moles in 44.25 g of CaSO4:
moles = 44.25 g / 136.14 g/mol = 0.325 moles
So, there are approximately 0.325 moles of calcium sulfate in 44.25 g. To three significant figures, this is 0.325 moles.
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