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To determine the mass of Ca(NO3)2 needed to have 0.650 mol, you would first calculate the molar mass of Ca(NO3)2, which is approximately 164.09 g/mol. Then, you can use the formula: mass = moles x molar mass. So, 0.650 mol x 164.09 g/mol ≈ 106.7 g of Ca(NO3)2 would need to be weighed out.
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