A compound has 43.7g Phosphorus and 56.39 of Oxygen Calculate the empirical formula

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units:

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?