Question

# One molecule of water $$(H_{2}O)$$ contains two atoms of hydrogen and one atom of oxygen. A hydrogen atom has a mass of $$1.0\ u$$ and an atom of oxygen has a mass of $$16\ u$$, approximately.What is the mass in kilograms of one molecule of water?

Solution

## As we know, In atomic mass units, the mass of one molecule is $$(16+1+1)u=18\ u$$. Using Eq $$1-9$$ we find$$18\ u=(18\ u)\left(\dfrac{1.6605402\times 10^{-27}\ kg}{lu}\right)=3.0\times 10^{-26}kg$$Physics

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