What is the molar mass of water?

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What is the molar mass of water?

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Answer 1 · 2017-06-18T05:14:51

A water molecule contains $3$ $3$ $atoms$ $"atoms"$ . These $3$ $3$ $atoms$ $"atoms"$ constitute $1$ $1$ $water molecule$ $"water molecule"$ .

Explanation:

A $water molecule$ $"water molecule"$ contains $3$ $3$ $atoms$ $"atoms"$ : $2 \times H$ $2xxH$ , and $1 \times O$ $1xxO$ . That is, those 3 atoms, when appropriately chemically bound, constitute a water molecule.

We know that $18.01 \cdot g$ $18.01*g$ of water contains $N_{A}$ $N_A$ water molecules, where $N_{A} = Avogadro's number = 6.022 \times 10^{23} \cdot m o l^{- 1}$ $N_A="Avogadro's number"=6.022xx10^23*mol^-1$ , and we get the mass by adding the atomic masses appropriately, i.e. $(2 \times 1.00794 + 15.999) \cdot g \cdot m o l^{- 1}$ $(2xx1.00794+15.999)*g*mol^-1$ .

How many atoms in an $18 \cdot g$ $18*g$ mass of water?

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What is the molar mass of water?

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