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How many atoms of hydrogen are there in 18 g of water?

Answer 1

Mateo Aguilar

#~~1.2*10^24# atoms of hydrogen

Water has a molar mass of #18.01528 \ "g/mol" ~~ 18 \ "g/mol"#.

So, in #18 \ "g"# of water, there will be

#(18cancel"g")/(18cancel"g""/mol")=1 \ "mol"#

Since water has a chemical formula of #H_2O#, there will be #2# moles of hydrogen in every mole of water.

In one mole of water, there will exist approximately #6.02*10^23# water molecules.

So, there will be a total of #6.02*10^23*2~~1.2*10^24# hydrogen atoms.

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Answer 2

Caleb Adams

There are roughly 2.7 × 10^24 hydrogen atoms in 18 grams of water.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.