How many millimoles of Ca(NO 3) 2 contain 4.78 × 10 22 formula units of Ca(NO 3) 2? The molar mass of Ca(NO 3) 2 is 164.10 g/mol.

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?