Question

Use the periodic table to calculate the GFW (molar mass) of Ca3(PO3)2 to 5 significant figures. Do not use scientific notation. A) 310.18 g/mol B) 294.06 g/mol C) 312.18 g/mol D) 298.06 g/mol

Answer 1

To calculate the molar mass of Ca3(PO3)2, find the individual molar masses of each element and multiply them by the corresponding subscripts in the chemical formula. The molar mass of Ca3(PO3)2 is 310.18 g/mol.

Step-by-step explanation:

To calculate the molar mass of Ca3(PO3)2, you need to find the individual molar masses of each element and multiply them by the corresponding subscripts in the chemical formula. The molar mass of Ca is 40.08 g/mol, the molar mass of P is 30.97 g/mol, and the molar mass of O is 16.00 g/mol.

For Ca3(PO3)2, we have:

• 3 mol of Ca, so (3)(40.08 g/mol) = 120.24 g/mol
• 2 mol of P, so (2)(30.97 g/mol) = 61.94 g/mol
• 8 mol of O, so (8)(16.00 g/mol) = 128.00 g/mol

The sum of these masses give the molar mass of Ca3(PO3)2 as 310.18 g/mol. Therefore, the answer is option A) 310.18 g/mol.

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