What could make AG become negative at a given enthalpy and entropy?

What is the mass of 4 molecules of co2

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.