Convert 345 moles of H20 to molecules?

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Answer 1 · 2018-02-23T12:13:33

#2.08xx10^26# molecules.

#1# mole of anything is #6.022*10^23# items of that thing. Likewise, #1# mole of #H_2O# is #6.022xx10^23# molecules.

This tells us that #345# moles of #H_2O# will be #345 xx (6.022xx10^23) = 2.078xx10^26# molecules.

The question contained #3# significant figures, so our answer must be #2.08xx10^26# molecules.