Araindrop has a mass of 0.050 grams. how many moles of water does a raindrop contain?

The rain drop of mass 0.050 g has 0.0028 moles of water.

Explanation:

We know that for each element or compound the molar mass of that compound is equal to 1 mole of that compound. So in the present case, the molar mass of water can be determined as sum of mass of two hydrogen atoms and one oxygen atom. Thus, the molar mass of water is found to be 18.01 g.

Since, 18.01 g of water = 1 mole of water

Then, 1 g of water = 1/18.01 mole of water.

But, here it is given that the raindrop contains 0.050 g of water, then

0.050 g of water = 0.050× moles = 0.0028 moles of water.

Thus, the rain drop of mass 0.050 g has 0.0028 moles of water.

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there are two significant figures.