Question

how many formula units are present in 42 g sample of (nh4)2 Cr7O7​

Answer 1

Answer:

Explanation: First you need to determine the number of moles in 0.67 g CaO . Then you will multiply the number of moles by 6.022×1023formula units/mol . To determine the molar mass of a compound, add the atomic weight on the periodic table in g/mol times each element's subscript.There are 2.52×1023 formula units in 39.8 g of magnesium chloride