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Chinomso

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lets take oxygen to be the substance given. the molecular weight also called the molar mass given as 16. the density always remain constant as 1g/ml. so lets comvert everything together as 5ml*1g/ml*1mole/16g = 0.313moles. remember that 16g/mol is the
Polar occurs whenever we have opposit charged ions. such HF, H being positively charged ion and F being negatively charged ion. Non Polar occurs whenever the two ions are identical. such as Hydrogen ion mixing with another Hydrogen ion to form hydrogen
I think the title should be called "Welcome Home"

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