The heat of vaporization for ethanol is 0.826 kj/j. calculate the heat energy in joules required to boil 45.65g of ethanol

The compound methyl butanoate smells like apples. its percent composition is 58.8% c, 9.9% h, and 31.4% o. what’s the empirical formula ?

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.