A child at the beach digs a hole

A child at the beach digs a hole in the sand and uses a pail to fill it with water having a mass of 1.20 kg. The mass of one molecule of water is 18.0 u.
(a) Find the number of water molecules in this pail of water.
(b) Suppose the quantity of water on Earth is constant at 1.32 x 1021 kg. How many of the water molecules in this pail of water are likely to have been in an equal quantity of water that once filled one particular claw print left by a Tyrannosaur hunting on a similar beach?
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