I think the answer is <span>PCl5 + 4H2O → 5HCl + H3PO4
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I pick but I'm not sure about it though 1and3
B. All atoms of silver have the same atomic number but different numbers of neutrons in the nucleus.
Let x represent the total distance around the track
Jason's distance: (5/7)x
Sara ran (4/5) of Jason's distance,
so she ran (4/5)*(5/7)x = (4/7)x
Sara ran 4/7 of the total distance
