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In question F11 in part c it asks to determine the mass percentage composition: 12.2% N, 5.26% H, 26.9% P, and 55.6% O. When I solved for the moles of O I got 55.6g/16.00gmol=3.48 mol because the number with the least significant figures is 3, but the solutions manual says 3.475 mol. Is this an error or am I doing something wrong?
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