Helium (H) is a valuable gas used in industry, low - temperature research deepsea diving tanks, and balloons. How many miles of the (He) atoms are in 6.46g of the (He)​

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

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?

Compare and contrast physical changes with chemical changes.