Answer to: Elements X and Y form a compound that is 40% X and 60% Y by mass. The atomic mass of X is twice that of Y. What is the empirical formula...
Find the molar mass, moles of each element, and number of atoms of each element for 0.9992 g NaCl, 0.9822 g C12H22O11, 0.9510 g NH4Cl, 0.9723 g C6H5OH, and 1.0038 g C9H20. Find the molar mass of NaCl. What is the mass of two moles of NaCl? ...
(1) the same period element increases with the number of atomic number, the melting point of the metal single mass of the element is increasing, and the melting point of the non-metal one is decreasing. (2) from top to bottom, the melting point of the metal elemental form is decreasing...