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How many molecules of H20 are there in 1.0 g of H20?

Sagot :

As a random guess, I'd have to say 20? I'm a bit rusty on my chemistry, but this is my thought process: If there's 1 proton and 0 neutrons in a single hydrogen atom, and each proton and neutron is 1g each, then i would assume that 20 atoms of H times (1 proton + 0 neutrons) would equal 20. Please correct me if I'm wrong :)