Which of the following is a Halogen??

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Based on its chemical properties, identify the position of each chemical family on the periodic table.