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Question

In 0.20 mole of phosphoric acid, H3PO4

a. how many H atoms are there?

b. what is the total number of atoms?

c. how many moles of O atoms are there?

Answer 1

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.20 mole of anything has .2 x 6.022x10^23 molecules in it

a. 3 x .2 x 6.022x10^23 , since there are 3 H's in H3PO4

b. H3PO4 has 8 atoms. so 8 x .2 x 6.022x10^23

c. .20 moles x 4 O atoms = .8 moles of O atoms