Mr. Tse has a glass of water with a volume of 250 mL and a temperature of 12 degrees Celsius. He add a piece of dry ice, CO2(s), which has a mass of 25 g, to cool down his water. If dry ice has an enthalpy of sublimation of 25.2 kJ/mol, calculate the final temperature of the water after the dry ice has fully dissolved.

56 moles of   lieter in chemistry

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.