Molar mass of "P_2O_5=142 gm"
Number of moles of "P_2O_5 \\ in \\ 0.320 \\ gm=\\frac{0.32}{142}"
Number of atoms in "P_2O_5 \\ sample=7 \\times N_A\\times \\frac{0.32}{142}=9.5\\times 10^{21}"
Where "N_A" is avagadro number("6.023 \\times 10^{23})"
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