How many moles of water (h2o) are present in a beaker containing 45.9 g h2o? give your answer to the correct number of significant figures. (molar mass of water = 18.02 g/mol)

2.55 moles

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.

To calculate the moles, we use the equation:

The rule apply for multiplication and division  is :

The least precise number present after the decimal point determines the number of significant figures in the answer. 45.9 has 3 significant figures and 18.02 has 4 significant figures.

Thus the mole of water will be 2.55 moles in three significant figures.

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