moles H2C2O4 = grams/molar mass
#molecules H2C2O4 = moles x 6.022E23.
# oxygen atoms = number of H2C2O4 molecules x 4.
Calculate the number of moles of molecules in 20.11 g of oxalic acid. H2C2O4 calculate the number of oxygen atoms in 20.11 g of oxalic acid
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