Calculate the internal energy of a system when a system absorbs 45kj of heat and does 67kj of work

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

Stage in which a star’s outer layers have started to cool and grow outward?

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?