How many moles are there in 18 grams of water

1 Mole

Explanation:

The molecular weight of H2O is 18grams/mole. The conversion from grams to moles looks something like this:

18grams H2O (1moleH2O/18grams H2O) = 1 mole

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

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