객관식The heat of combustion of hydrogen gas is –286 kJ/mol. What is this value expressed in kJ/g?140views
객관식What is the total number of atoms present in one formula unit of the compound Ca(ClO_3)_2?135views
객관식If seawater contains 3.2 × 10^{-9} g of gold per liter, how many grams of gold are present in 1.00 L of seawater?102views