Write the empirical formula

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?

The number at the end of an isotope’s name is the number.

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?