The combustion of a sample butane, c4h10 (lighter fluid) produced 2.46 grams of water. how many moles of water formed

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

I’m an electrically neutral atomic any element, there are equal numbers of

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?