If a liquid sample of naphthalene is heated and remains at 218°c until it is completely vaporized, you know that 218°c is the of naphthalene.

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?

The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.