I do not know at ALL. =( Sorry.
Answer:
You multiply 0.5 by 20 which will give you 10 your answer is 10
The chemical formula for water is H2O which means that every molecule of water has 2 atoms of hydrogen (H) and one atom of oxygen (O). Here comes the key part. From the Periodic Table of Elements, one sees that one molecule of oxygen atoms weigh 16 grams.
I apologize if this is not what you meant. If you have further questions just tell me.
A physical attribute of an organism, such as hair color, height, color pattern, etc. or is may be a trait
It would be my clown fish on the Shelly of mapel fish