Agreat amount of scientific evidence is available to indicate that coal

Acompound is found to contain 6.1% hydrogen and 93.9% oxygen. find it’s empirical formula.

Is laundry detergent an acid or a base?

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 ?