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TeaBoh

S3 Chemistry

Question post on Sat, 13/05/2017 9:36pm

Hi

Can someone please help me to solve this with steps?

Thank you.

Answer

SAHMom · Answer 1 · Post on Sat, 13/05/2017 10:19pm

1 mole of H2O –> 1+1+16=18g (molar mass) –> 6 x 10²³H2O molecules –> 2x6x10²³H atoms + 6×10²³O atoms

12.6 moles of H2O –> 12.6 x 2 x 6 x 10²³H atoms = 151.2 x 10²³= 1.512 x 10²⁵H atoms#

Hope you have the answer to counter check in case I got it wrong. Too many years ago. I opened my DC’s textbook to double check Avogadro’s constant last night… 🙂 photo attached for info only.

SAHMom · Answer 2 · Post on Sat, 13/05/2017 10:19pm

1 mole of H2O –> 1+1+16=18g (molar mass) –> 6 x 10²³H2O molecules –> 2x6x10²³H atoms + 6×10²³O atoms

12.6 moles of H2O –> 12.6 x 2 x 6 x 10²³H atoms = 151.2 x 10²³= 1.512 x 10²⁵H atoms#

Hope you have the answer to counter check in case I got it wrong. Too many years ago. I opened my DC’s textbook to double check Avogadro’s constant last night… 🙂 photo attached for info only.

TeaBoh · Answer 3 · Post on Sat, 13/05/2017 11:43pm

TeaBoh Post on Sat, 13/05/2017 11:43pm

Thank you very much, SAHMom. Your answer is correct!

SAHMom · Answer 4 · Post on Sat, 13/05/2017 11:48pm

SAHMom Post on Sat, 13/05/2017 11:48pm

You are welcome and thanks for checking. 🙂

Smartwolf · Answer 5 · Post on Tue, 11/09/2018 10:34pm

1 mole of H2O –> 1+1+16=18g (molar mass) –> 6 x 10²³H2O molecules –> 2x6x10²³H atoms + 6×10²³O atoms

12.6 moles of H2O –> 12.6 x 2 x 6 x 10²³H atoms = 151.2 x 10²³= 1.512 x 10²⁵H atoms#