Which sample of HCl(aq) contains the greatest number of moles of solute particles?
A) A sample of a 2.0 M HCl(aq) solution
B) A sample of a 3.2 M HCl(aq) solution
C) A sample of a 0.20 M HCl(aq) solution
D) A sample of a 1.0 M HCl(aq) solution

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 ?

Why is the melting of ice a physical change ?

What volume would 2.25 moles of ne has occupy at stp?