What is the mass of 0.0586 moles of iron? and How many molecules are present in 0.0258 g of NH3?

Answer 1

0.0586 moles of iron x 55.85 grams/mole Molar mass ) from periodic table)=3.27 grams. 0.0258g NH₃ x 1 mole/17.03 grams=0.00151 moles X 6.022X 10²³ molecules/mole (the Avogadro number)=9.12 X 10²⁰ molecules.