A fixed mass of a gas occupies 300cm cube at 25 degree centigrade occupies 650cm cube. what volume would the gas occupy when temperature is reduced to 20 degree centigrade pls help me

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Chromosome 17 is made of over million base pairs.