Air in a cylinder is compressed (volume is reduced and pressure increased) by moving a piston. In our sign convention, is this work positive or negative?.

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

Calculate the number of moles of ethane in 100 grams