Is the number of moles of a gas equal to the mass divided by the molar mass true or false ?

An observation that requires measurement is called quantitative observable or qualitative

What is the relationship between particles in matter

An engineer wishes to design a container that will hold 12.0 mol of ethane at a pressure no greater than 5.00x10*2 kpa and a temperature of 52.0 degrees celsius. what is the minimum volume the container can have?