How many moles of oxygen atoms are contained in 1.25 mol of H3PO4?
one mole H3PO4 contain four moles of oxygen
then 1.25 moles contain how many moles of oxygen
1 Mole of H3PO4 = 4 moles of oxygen
1.25 moles of H3PO4 = x moles of oxygen
cross multiply
x = 1.25 x 4 / 1 = 5 moles
therefore 1.25 moles of H3PO4 contain 5 moles of oxygen
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