A little quantity of trichloromethane (b. pt. 60° C) was added to a large quantity of ethanol (b. pt. 78°C). The most probable boiling point of the
resultant mixture is from
A. 69°C - 70°C
B. 70°C - 74°C
C. 82°C - 84°C
D. 60°C - 78°C

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 ?

What is the atomic number of an atom that has 6 protons

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution