You have 4.2 moles of water. how many oxygen atoms do you have?

Firstly, the formula of water is H2O. There is 1 mole of oxygen atoms per mole of water. Therefore, in 4.2 moles of water there are 4.2 moles of oxygen atoms. The real amount is calculated as follows:

the answer to your question is c.

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1.43 x 10^-11 j the guy commented the awnser just making sure u see it .