The earliest known human ancestors are believed to have lived 3 billion years ago. true or false

The fact that the total amount of energy in a system remains constant is a(n)

How many grams of sodium chloride are in 250ml of a 2.5m naci solution

8. how much enthalpy/heat is transferred when 0.5113gof ammonia (nh3) reacts with excess oxygen according| to the following equation: 4nh3 +502 - 4n0+ 6h20ah = -905.4j