Qu'est-ce que la masse?

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 ?

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate